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+/*
+  Copyright (c) 2010, Nicolas Garcia Belmonte
+  All rights reserved
+
+  > Redistribution and use in source and binary forms, with or without
+  > modification, are permitted provided that the following conditions are met:
+  >      * Redistributions of source code must retain the above copyright
+  >        notice, this list of conditions and the following disclaimer.
+  >      * Redistributions in binary form must reproduce the above copyright
+  >        notice, this list of conditions and the following disclaimer in the
+  >        documentation and/or other materials provided with the distribution.
+  >      * Neither the name of the organization nor the
+  >        names of its contributors may be used to endorse or promote products
+  >        derived from this software without specific prior written permission.
+  >
+  >  THIS SOFTWARE IS PROVIDED BY NICOLAS GARCIA BELMONTE ``AS IS'' AND ANY
+  >  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+  >  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  >  DISCLAIMED. IN NO EVENT SHALL NICOLAS GARCIA BELMONTE BE LIABLE FOR ANY
+  >  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  >  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  >  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  >  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  >  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+  >  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+ (function () { 
+
+/*
+  File: Core.js
+
+ */
+
+/*
+ Object: $jit
+ 
+ Defines the namespace for all library Classes and Objects. 
+ This variable is the *only* global variable defined in the Toolkit. 
+ There are also other interesting properties attached to this variable described below.
+ */
+window.$jit = function(w) {
+  w = w || window;
+  for(var k in $jit) {
+    if($jit[k].$extend) {
+      w[k] = $jit[k];
+    }
+  }
+};
+
+$jit.version = '2.0.0b';
+/*
+  Object: $jit.id
+  
+  Works just like *document.getElementById*
+  
+  Example:
+  (start code js)
+  var element = $jit.id('elementId');
+  (end code)
+
+*/
+
+/*
+ Object: $jit.util
+ 
+ Contains utility functions.
+ 
+ Some of the utility functions and the Class system were based in the MooTools Framework 
+ <http://mootools.net>. Copyright (c) 2006-2010 Valerio Proietti, <http://mad4milk.net/>. 
+ MIT license <http://mootools.net/license.txt>.
+ 
+ These methods are generally also implemented in DOM manipulation frameworks like JQuery, MooTools and Prototype.
+ I'd suggest you to use the functions from those libraries instead of using these, since their functions 
+ are widely used and tested in many different platforms/browsers. Use these functions only if you have to.
+ 
+ */
+var $ = function(d) {
+  return document.getElementById(d);
+};
+
+$.empty = function() {
+};
+
+/*
+  Method: extend
+  
+  Augment an object by appending another object's properties.
+  
+  Parameters:
+  
+  original - (object) The object to be extended.
+  extended - (object) An object which properties are going to be appended to the original object.
+  
+  Example:
+  (start code js)
+  $jit.util.extend({ 'a': 1, 'b': 2 }, { 'b': 3, 'c': 4 }); //{ 'a':1, 'b': 3, 'c': 4 }
+  (end code)
+*/
+$.extend = function(original, extended) {
+  for ( var key in (extended || {}))
+    original[key] = extended[key];
+  return original;
+};
+
+$.lambda = function(value) {
+  return (typeof value == 'function') ? value : function() {
+    return value;
+  };
+};
+
+$.time = Date.now || function() {
+  return +new Date;
+};
+
+/*
+  Method: splat
+  
+  Returns an array wrapping *obj* if *obj* is not an array. Returns *obj* otherwise.
+  
+  Parameters:
+  
+  obj - (mixed) The object to be wrapped in an array.
+  
+  Example:
+  (start code js)
+  $jit.util.splat(3);   //[3]
+  $jit.util.splat([3]); //[3]
+  (end code)
+*/
+$.splat = function(obj) {
+  var type = $.type(obj);
+  return type ? ((type != 'array') ? [ obj ] : obj) : [];
+};
+
+$.type = function(elem) {
+  var type = $.type.s.call(elem).match(/^\[object\s(.*)\]$/)[1].toLowerCase();
+  if(type != 'object') return type;
+  if(elem && elem.$$family) return elem.$$family;
+  return (elem && elem.nodeName && elem.nodeType == 1)? 'element' : type;
+};
+$.type.s = Object.prototype.toString;
+
+/*
+  Method: each
+  
+  Iterates through an iterable applying *f*.
+  
+  Parameters:
+  
+  iterable - (array) The original array.
+  fn - (function) The function to apply to the array elements.
+  
+  Example:
+  (start code js)
+  $jit.util.each([3, 4, 5], function(n) { alert('number ' + n); });
+  (end code)
+*/
+$.each = function(iterable, fn) {
+  var type = $.type(iterable);
+  if (type == 'object') {
+    for ( var key in iterable)
+      fn(iterable[key], key);
+  } else {
+    for ( var i = 0, l = iterable.length; i < l; i++)
+      fn(iterable[i], i);
+  }
+};
+
+$.indexOf = function(array, item) {
+  if(Array.indexOf) return array.indexOf(item);
+  for(var i=0,l=array.length; i<l; i++) {
+    if(array[i] === item) return i;
+  }
+  return -1;
+};
+
+/*
+  Method: map
+  
+  Maps or collects an array by applying *f*.
+  
+  Parameters:
+  
+  array - (array) The original array.
+  f - (function) The function to apply to the array elements.
+  
+  Example:
+  (start code js)
+  $jit.util.map([3, 4, 5], function(n) { return n*n; }); //[9, 16, 25]
+  (end code)
+*/
+$.map = function(array, f) {
+  var ans = [];
+  $.each(array, function(elem, i) {
+    ans.push(f(elem, i));
+  });
+  return ans;
+};
+
+/*
+  Method: reduce
+  
+  Iteratively applies the binary function *f* storing the result in an accumulator.
+  
+  Parameters:
+  
+  array - (array) The original array.
+  f - (function) The function to apply to the array elements.
+  opt - (optional|mixed) The starting value for the acumulator.
+  
+  Example:
+  (start code js)
+  $jit.util.reduce([3, 4, 5], function(x, y) { return x + y; }, 0); //12
+  (end code)
+*/
+$.reduce = function(array, f, opt) {
+  var l = array.length;
+  if(l==0) return opt;
+  var acum = arguments.length == 3? opt : array[--l];
+  while(l--) {
+    acum = f(acum, array[l]);
+  }
+  return acum;
+};
+
+/*
+  Method: merge
+  
+  Merges n-objects and their sub-objects creating a new, fresh object.
+  
+  Parameters:
+  
+  An arbitrary number of objects.
+  
+  Example:
+  (start code js)
+  $jit.util.merge({ 'a': 1, 'b': 2 }, { 'b': 3, 'c': 4 }); //{ 'a':1, 'b': 3, 'c': 4 }
+  (end code)
+*/
+$.merge = function() {
+  var mix = {};
+  for ( var i = 0, l = arguments.length; i < l; i++) {
+    var object = arguments[i];
+    if ($.type(object) != 'object')
+      continue;
+    for ( var key in object) {
+      var op = object[key], mp = mix[key];
+      mix[key] = (mp && $.type(op) == 'object' && $.type(mp) == 'object') ? $
+          .merge(mp, op) : $.unlink(op);
+    }
+  }
+  return mix;
+};
+
+$.unlink = function(object) {
+  var unlinked;
+  switch ($.type(object)) {
+  case 'object':
+    unlinked = {};
+    for ( var p in object)
+      unlinked[p] = $.unlink(object[p]);
+    break;
+  case 'array':
+    unlinked = [];
+    for ( var i = 0, l = object.length; i < l; i++)
+      unlinked[i] = $.unlink(object[i]);
+    break;
+  default:
+    return object;
+  }
+  return unlinked;
+};
+
+$.zip = function() {
+  if(arguments.length === 0) return [];
+  for(var j=0, ans=[], l=arguments.length, ml=arguments[0].length; j<ml; j++) {
+    for(var i=0, row=[]; i<l; i++) {
+      row.push(arguments[i][j]);
+    }
+    ans.push(row);
+  }
+  return ans;
+};
+
+/*
+  Method: rgbToHex
+  
+  Converts an RGB array into a Hex string.
+  
+  Parameters:
+  
+  srcArray - (array) An array with R, G and B values
+  
+  Example:
+  (start code js)
+  $jit.util.rgbToHex([255, 255, 255]); //'#ffffff'
+  (end code)
+*/
+$.rgbToHex = function(srcArray, array) {
+  if (srcArray.length < 3)
+    return null;
+  if (srcArray.length == 4 && srcArray[3] == 0 && !array)
+    return 'transparent';
+  var hex = [];
+  for ( var i = 0; i < 3; i++) {
+    var bit = (srcArray[i] - 0).toString(16);
+    hex.push(bit.length == 1 ? '0' + bit : bit);
+  }
+  return array ? hex : '#' + hex.join('');
+};
+
+/*
+  Method: hexToRgb
+  
+  Converts an Hex color string into an RGB array.
+  
+  Parameters:
+  
+  hex - (string) A color hex string.
+  
+  Example:
+  (start code js)
+  $jit.util.hexToRgb('#fff'); //[255, 255, 255]
+  (end code)
+*/
+$.hexToRgb = function(hex) {
+  if (hex.length != 7) {
+    hex = hex.match(/^#?(\w{1,2})(\w{1,2})(\w{1,2})$/);
+    hex.shift();
+    if (hex.length != 3)
+      return null;
+    var rgb = [];
+    for ( var i = 0; i < 3; i++) {
+      var value = hex[i];
+      if (value.length == 1)
+        value += value;
+      rgb.push(parseInt(value, 16));
+    }
+    return rgb;
+  } else {
+    hex = parseInt(hex.slice(1), 16);
+    return [ hex >> 16, hex >> 8 & 0xff, hex & 0xff ];
+  }
+};
+
+$.destroy = function(elem) {
+  $.clean(elem);
+  if (elem.parentNode)
+    elem.parentNode.removeChild(elem);
+  if (elem.clearAttributes)
+    elem.clearAttributes();
+};
+
+$.clean = function(elem) {
+  for (var ch = elem.childNodes, i = 0, l = ch.length; i < l; i++) {
+    $.destroy(ch[i]);
+  }
+};
+
+/*
+  Method: addEvent
+  
+  Cross-browser add event listener.
+  
+  Parameters:
+  
+  obj - (obj) The Element to attach the listener to.
+  type - (string) The listener type. For example 'click', or 'mousemove'.
+  fn - (function) The callback function to be used when the event is fired.
+  
+  Example:
+  (start code js)
+  $jit.util.addEvent(elem, 'click', function(){ alert('hello'); });
+  (end code)
+*/
+$.addEvent = function(obj, type, fn) {
+  if (obj.addEventListener)
+    obj.addEventListener(type, fn, false);
+  else
+    obj.attachEvent('on' + type, fn);
+};
+
+$.addEvents = function(obj, typeObj) {
+  for(var type in typeObj) {
+    $.addEvent(obj, type, typeObj[type]);
+  }
+};
+
+$.hasClass = function(obj, klass) {
+  return (' ' + obj.className + ' ').indexOf(' ' + klass + ' ') > -1;
+};
+
+$.addClass = function(obj, klass) {
+  if (!$.hasClass(obj, klass))
+    obj.className = (obj.className + " " + klass);
+};
+
+$.removeClass = function(obj, klass) {
+  obj.className = obj.className.replace(new RegExp(
+      '(^|\\s)' + klass + '(?:\\s|$)'), '$1');
+};
+
+$.getPos = function(elem) {
+  var offset = getOffsets(elem);
+  var scroll = getScrolls(elem);
+  return {
+    x: offset.x - scroll.x,
+    y: offset.y - scroll.y
+  };
+
+  function getOffsets(elem) {
+    var position = {
+      x: 0,
+      y: 0
+    };
+    while (elem && !isBody(elem)) {
+      position.x += elem.offsetLeft;
+      position.y += elem.offsetTop;
+      elem = elem.offsetParent;
+    }
+    return position;
+  }
+
+  function getScrolls(elem) {
+    var position = {
+      x: 0,
+      y: 0
+    };
+    while (elem && !isBody(elem)) {
+      position.x += elem.scrollLeft;
+      position.y += elem.scrollTop;
+      elem = elem.parentNode;
+    }
+    return position;
+  }
+
+  function isBody(element) {
+    return (/^(?:body|html)$/i).test(element.tagName);
+  }
+};
+
+$.event = {
+  get: function(e, win) {
+    win = win || window;
+    return e || win.event;
+  },
+  getWheel: function(e) {
+    return e.wheelDelta? e.wheelDelta / 120 : -(e.detail || 0) / 3;
+  },
+  isRightClick: function(e) {
+    return (e.which == 3 || e.button == 2);
+  },
+  getPos: function(e, win) {
+    // get mouse position
+    win = win || window;
+    e = e || win.event;
+    var doc = win.document;
+    doc = doc.documentElement || doc.body;
+    //TODO(nico): make touch event handling better
+    if(e.touches && e.touches.length) {
+      e = e.touches[0];
+    }
+    var page = {
+      x: e.pageX || (e.clientX + doc.scrollLeft),
+      y: e.pageY || (e.clientY + doc.scrollTop)
+    };
+    return page;
+  },
+  stop: function(e) {
+    if (e.stopPropagation) e.stopPropagation();
+    e.cancelBubble = true;
+    if (e.preventDefault) e.preventDefault();
+    else e.returnValue = false;
+  }
+};
+
+$jit.util = $jit.id = $;
+
+var Class = function(properties) {
+  properties = properties || {};
+  var klass = function() {
+    for ( var key in this) {
+      if (typeof this[key] != 'function')
+        this[key] = $.unlink(this[key]);
+    }
+    this.constructor = klass;
+    if (Class.prototyping)
+      return this;
+    var instance = this.initialize ? this.initialize.apply(this, arguments)
+        : this;
+    //typize
+    this.$$family = 'class';
+    return instance;
+  };
+
+  for ( var mutator in Class.Mutators) {
+    if (!properties[mutator])
+      continue;
+    properties = Class.Mutators[mutator](properties, properties[mutator]);
+    delete properties[mutator];
+  }
+
+  $.extend(klass, this);
+  klass.constructor = Class;
+  klass.prototype = properties;
+  return klass;
+};
+
+Class.Mutators = {
+
+  Implements: function(self, klasses) {
+    $.each($.splat(klasses), function(klass) {
+      Class.prototyping = klass;
+      var instance = (typeof klass == 'function') ? new klass : klass;
+      for ( var prop in instance) {
+        if (!(prop in self)) {
+          self[prop] = instance[prop];
+        }
+      }
+      delete Class.prototyping;
+    });
+    return self;
+  }
+
+};
+
+$.extend(Class, {
+
+  inherit: function(object, properties) {
+    for ( var key in properties) {
+      var override = properties[key];
+      var previous = object[key];
+      var type = $.type(override);
+      if (previous && type == 'function') {
+        if (override != previous) {
+          Class.override(object, key, override);
+        }
+      } else if (type == 'object') {
+        object[key] = $.merge(previous, override);
+      } else {
+        object[key] = override;
+      }
+    }
+    return object;
+  },
+
+  override: function(object, name, method) {
+    var parent = Class.prototyping;
+    if (parent && object[name] != parent[name])
+      parent = null;
+    var override = function() {
+      var previous = this.parent;
+      this.parent = parent ? parent[name] : object[name];
+      var value = method.apply(this, arguments);
+      this.parent = previous;
+      return value;
+    };
+    object[name] = override;
+  }
+
+});
+
+Class.prototype.implement = function() {
+  var proto = this.prototype;
+  $.each(Array.prototype.slice.call(arguments || []), function(properties) {
+    Class.inherit(proto, properties);
+  });
+  return this;
+};
+
+$jit.Class = Class;
+
+/*
+  Object: $jit.json
+  
+  Provides JSON utility functions.
+  
+  Most of these functions are JSON-tree traversal and manipulation functions.
+*/
+$jit.json = {
+  /*
+     Method: prune
+  
+     Clears all tree nodes having depth greater than maxLevel.
+  
+     Parameters:
+  
+        tree - (object) A JSON tree object. For more information please see <Loader.loadJSON>.
+        maxLevel - (number) An integer specifying the maximum level allowed for this tree. All nodes having depth greater than max level will be deleted.
+
+  */
+  prune: function(tree, maxLevel) {
+    this.each(tree, function(elem, i) {
+      if (i == maxLevel && elem.children) {
+        delete elem.children;
+        elem.children = [];
+      }
+    });
+  },
+  /*
+     Method: getParent
+  
+     Returns the parent node of the node having _id_ as id.
+  
+     Parameters:
+  
+        tree - (object) A JSON tree object. See also <Loader.loadJSON>.
+        id - (string) The _id_ of the child node whose parent will be returned.
+
+    Returns:
+
+        A tree JSON node if any, or false otherwise.
+  
+  */
+  getParent: function(tree, id) {
+    if (tree.id == id)
+      return false;
+    var ch = tree.children;
+    if (ch && ch.length > 0) {
+      for ( var i = 0; i < ch.length; i++) {
+        if (ch[i].id == id)
+          return tree;
+        else {
+          var ans = this.getParent(ch[i], id);
+          if (ans)
+            return ans;
+        }
+      }
+    }
+    return false;
+  },
+  /*
+     Method: getSubtree
+  
+     Returns the subtree that matches the given id.
+  
+     Parameters:
+  
+        tree - (object) A JSON tree object. See also <Loader.loadJSON>.
+        id - (string) A node *unique* identifier.
+  
+     Returns:
+  
+        A subtree having a root node matching the given id. Returns null if no subtree matching the id is found.
+
+  */
+  getSubtree: function(tree, id) {
+    if (tree.id == id)
+      return tree;
+    for ( var i = 0, ch = tree.children; i < ch.length; i++) {
+      var t = this.getSubtree(ch[i], id);
+      if (t != null)
+        return t;
+    }
+    return null;
+  },
+  /*
+     Method: eachLevel
+  
+      Iterates on tree nodes with relative depth less or equal than a specified level.
+  
+     Parameters:
+  
+        tree - (object) A JSON tree or subtree. See also <Loader.loadJSON>.
+        initLevel - (number) An integer specifying the initial relative level. Usually zero.
+        toLevel - (number) An integer specifying a top level. This method will iterate only through nodes with depth less than or equal this number.
+        action - (function) A function that receives a node and an integer specifying the actual level of the node.
+          
+    Example:
+   (start code js)
+     $jit.json.eachLevel(tree, 0, 3, function(node, depth) {
+        alert(node.name + ' ' + depth);
+     });
+   (end code)
+  */
+  eachLevel: function(tree, initLevel, toLevel, action) {
+    if (initLevel <= toLevel) {
+      action(tree, initLevel);
+      if(!tree.children) return;
+      for ( var i = 0, ch = tree.children; i < ch.length; i++) {
+        this.eachLevel(ch[i], initLevel + 1, toLevel, action);
+      }
+    }
+  },
+  /*
+     Method: each
+  
+      A JSON tree iterator.
+  
+     Parameters:
+  
+        tree - (object) A JSON tree or subtree. See also <Loader.loadJSON>.
+        action - (function) A function that receives a node.
+
+    Example:
+    (start code js)
+      $jit.json.each(tree, function(node) {
+        alert(node.name);
+      });
+    (end code)
+          
+  */
+  each: function(tree, action) {
+    this.eachLevel(tree, 0, Number.MAX_VALUE, action);
+  }
+};
+
+
+/*
+     An object containing multiple type of transformations. 
+*/
+
+$jit.Trans = {
+  $extend: true,
+  
+  linear: function(p){
+    return p;
+  }
+};
+
+var Trans = $jit.Trans;
+
+(function(){
+
+  var makeTrans = function(transition, params){
+    params = $.splat(params);
+    return $.extend(transition, {
+      easeIn: function(pos){
+        return transition(pos, params);
+      },
+      easeOut: function(pos){
+        return 1 - transition(1 - pos, params);
+      },
+      easeInOut: function(pos){
+        return (pos <= 0.5)? transition(2 * pos, params) / 2 : (2 - transition(
+            2 * (1 - pos), params)) / 2;
+      }
+    });
+  };
+
+  var transitions = {
+
+    Pow: function(p, x){
+      return Math.pow(p, x[0] || 6);
+    },
+
+    Expo: function(p){
+      return Math.pow(2, 8 * (p - 1));
+    },
+
+    Circ: function(p){
+      return 1 - Math.sin(Math.acos(p));
+    },
+
+    Sine: function(p){
+      return 1 - Math.sin((1 - p) * Math.PI / 2);
+    },
+
+    Back: function(p, x){
+      x = x[0] || 1.618;
+      return Math.pow(p, 2) * ((x + 1) * p - x);
+    },
+
+    Bounce: function(p){
+      var value;
+      for ( var a = 0, b = 1; 1; a += b, b /= 2) {
+        if (p >= (7 - 4 * a) / 11) {
+          value = b * b - Math.pow((11 - 6 * a - 11 * p) / 4, 2);
+          break;
+        }
+      }
+      return value;
+    },
+
+    Elastic: function(p, x){
+      return Math.pow(2, 10 * --p)
+          * Math.cos(20 * p * Math.PI * (x[0] || 1) / 3);
+    }
+
+  };
+
+  $.each(transitions, function(val, key){
+    Trans[key] = makeTrans(val);
+  });
+
+  $.each( [
+      'Quad', 'Cubic', 'Quart', 'Quint'
+  ], function(elem, i){
+    Trans[elem] = makeTrans(function(p){
+      return Math.pow(p, [
+        i + 2
+      ]);
+    });
+  });
+
+})();
+
+/*
+   A Class that can perform animations for generic objects.
+
+   If you are looking for animation transitions please take a look at the <Trans> object.
+
+   Used by:
+
+   <Graph.Plot>
+   
+   Based on:
+   
+   The Animation class is based in the MooTools Framework <http://mootools.net>. Copyright (c) 2006-2009 Valerio Proietti, <http://mad4milk.net/>. MIT license <http://mootools.net/license.txt>.
+
+*/
+
+var Animation = new Class( {
+
+  initialize: function(options){
+    this.setOptions(options);
+  },
+
+  setOptions: function(options){
+    var opt = {
+      duration: 2500,
+      fps: 40,
+      transition: Trans.Quart.easeInOut,
+      compute: $.empty,
+      complete: $.empty,
+      link: 'ignore'
+    };
+    this.opt = $.merge(opt, options || {});
+    return this;
+  },
+
+  step: function(){
+    var time = $.time(), opt = this.opt;
+    if (time < this.time + opt.duration) {
+      var delta = opt.transition((time - this.time) / opt.duration);
+      opt.compute(delta);
+    } else {
+      this.timer = clearInterval(this.timer);
+      opt.compute(1);
+      opt.complete();
+    }
+  },
+
+  start: function(){
+    if (!this.check())
+      return this;
+    this.time = 0;
+    this.startTimer();
+    return this;
+  },
+
+  startTimer: function(){
+    var that = this, fps = this.opt.fps;
+    if (this.timer)
+      return false;
+    this.time = $.time() - this.time;
+    this.timer = setInterval((function(){
+      that.step();
+    }), Math.round(1000 / fps));
+    return true;
+  },
+
+  pause: function(){
+    this.stopTimer();
+    return this;
+  },
+
+  resume: function(){
+    this.startTimer();
+    return this;
+  },
+
+  stopTimer: function(){
+    if (!this.timer)
+      return false;
+    this.time = $.time() - this.time;
+    this.timer = clearInterval(this.timer);
+    return true;
+  },
+
+  check: function(){
+    if (!this.timer)
+      return true;
+    if (this.opt.link == 'cancel') {
+      this.stopTimer();
+      return true;
+    }
+    return false;
+  }
+});
+
+
+var Options = function() {
+  var args = arguments;
+  for(var i=0, l=args.length, ans={}; i<l; i++) {
+    var opt = Options[args[i]];
+    if(opt.$extend) {
+      $.extend(ans, opt);
+    } else {
+      ans[args[i]] = opt;  
+    }
+  }
+  return ans;
+};
+
+/*
+ * File: Options.AreaChart.js
+ *
+*/
+
+/*
+  Object: Options.AreaChart
+  
+  <AreaChart> options. 
+  Other options included in the AreaChart are <Options.Canvas>, <Options.Label>, <Options.Margin>, <Options.Tips> and <Options.Events>.
+  
+  Syntax:
+  
+  (start code js)
+
+  Options.AreaChart = {
+    animate: true,
+    labelOffset: 3,
+    type: 'stacked',
+    selectOnHover: true,
+    showAggregates: true,
+    showLabels: true,
+    filterOnClick: false,
+    restoreOnRightClick: false
+  };
+  
+  (end code)
+  
+  Example:
+  
+  (start code js)
+
+  var areaChart = new $jit.AreaChart({
+    animate: true,
+    type: 'stacked:gradient',
+    selectOnHover: true,
+    filterOnClick: true,
+    restoreOnRightClick: true
+  });
+  
+  (end code)
+
+  Parameters:
+  
+  animate - (boolean) Default's *true*. Whether to add animated transitions when filtering/restoring stacks.
+  labelOffset - (number) Default's *3*. Adds margin between the label and the default place where it should be drawn.
+  type - (string) Default's *'stacked'*. Stack style. Posible values are 'stacked', 'stacked:gradient' to add gradients.
+  selectOnHover - (boolean) Default's *true*. If true, it will add a mark to the hovered stack.
+  showAggregates - (boolean) Default's *true*. Display the sum of the values of the different stacks.
+  showLabels - (boolean) Default's *true*. Display the name of the slots.
+  filterOnClick - (boolean) Default's *true*. Select the clicked stack by hiding all other stacks.
+  restoreOnRightClick - (boolean) Default's *true*. Show all stacks by right clicking.
+  
+*/
+  
+Options.AreaChart = {
+  $extend: true,
+
+  animate: true,
+  labelOffset: 3, // label offset
+  type: 'stacked', // gradient
+  Tips: {
+    enable: false,
+    onShow: $.empty,
+    onHide: $.empty
+  },
+  Events: {
+    enable: false,
+    onClick: $.empty
+  },
+  selectOnHover: true,
+  showAggregates: true,
+  showLabels: true,
+  filterOnClick: false,
+  restoreOnRightClick: false
+};
+
+/*
+ * File: Options.Margin.js
+ *
+*/
+
+/*
+  Object: Options.Margin
+  
+  Canvas drawing margins. 
+  
+  Syntax:
+  
+  (start code js)
+
+  Options.Margin = {
+    top: 0,
+    left: 0,
+    right: 0,
+    bottom: 0
+  };
+  
+  (end code)
+  
+  Example:
+  
+  (start code js)
+
+  var viz = new $jit.Viz({
+    Margin: {
+      right: 10,
+      bottom: 20
+    }
+  });
+  
+  (end code)
+
+  Parameters:
+  
+  top - (number) Default's *0*. Top margin.
+  left - (number) Default's *0*. Left margin.
+  right - (number) Default's *0*. Right margin.
+  bottom - (number) Default's *0*. Bottom margin.
+  
+*/
+
+Options.Margin = {
+  $extend: false,
+  
+  top: 0,
+  left: 0,
+  right: 0,
+  bottom: 0
+};
+
+/*
+ * File: Options.Canvas.js
+ *
+*/
+
+/*
+  Object: Options.Canvas
+  
+  These are Canvas general options, like where to append it in the DOM, its dimensions, background, 
+  and other more advanced options.
+  
+  Syntax:
+  
+  (start code js)
+
+  Options.Canvas = {
+    injectInto: 'id',
+    width: false,
+    height: false,
+    useCanvas: false,
+    withLabels: true,
+    background: false
+  };  
+  (end code)
+  
+  Example:
+  
+  (start code js)
+  var viz = new $jit.Viz({
+    injectInto: 'someContainerId',
+    width: 500,
+    height: 700
+  });
+  (end code)
+  
+  Parameters:
+  
+  injectInto - *required* (string|element) The id of the DOM container for the visualization. It can also be an Element provided that it has an id.
+  width - (number) Default's to the *container's offsetWidth*. The width of the canvas.
+  height - (number) Default's to the *container's offsetHeight*. The height of the canvas.
+  useCanvas - (boolean|object) Default's *false*. You can pass another <Canvas> instance to be used by the visualization.
+  withLabels - (boolean) Default's *true*. Whether to use a label container for the visualization.
+  background - (boolean|object) Default's *false*. An object containing information about the rendering of a background canvas.
+*/
+
+Options.Canvas = {
+    $extend: true,
+    
+    injectInto: 'id',
+    width: false,
+    height: false,
+    useCanvas: false,
+    withLabels: true,
+    background: false
+};
+
+/*
+ * File: Options.Tree.js
+ *
+*/
+
+/*
+  Object: Options.Tree
+  
+  Options related to (strict) Tree layout algorithms. These options are used by the <ST> visualization.
+  
+  Syntax:
+  
+  (start code js)
+  Options.Tree = {
+    orientation: "left",
+    subtreeOffset: 8,
+    siblingOffset: 5,
+    indent:10,
+    multitree: false,
+    align:"center"
+  };
+  (end code)
+  
+  Example:
+  
+  (start code js)
+  var st = new $jit.ST({
+    orientation: 'left',
+    subtreeOffset: 1,
+    siblingOFfset: 5,
+    multitree: true
+  });
+  (end code)
+
+  Parameters:
+    
+  subtreeOffset - (number) Default's 8. Separation offset between subtrees.
+  siblingOffset - (number) Default's 5. Separation offset between siblings.
+  orientation - (string) Default's 'left'. Tree orientation layout. Possible values are 'left', 'top', 'right', 'bottom'.
+  align - (string) Default's *center*. Whether the tree alignment is 'left', 'center' or 'right'.
+  indent - (number) Default's 10. Used when *align* is left or right and shows an indentation between parent and children.
+  multitree - (boolean) Default's *false*. Used with the node $orn data property for creating multitrees.
+     
+*/
+Options.Tree = {
+    $extend: true,
+    
+    orientation: "left",
+    subtreeOffset: 8,
+    siblingOffset: 5,
+    indent:10,
+    multitree: false,
+    align:"center"
+};
+
+
+/*
+ * File: Options.Node.js
+ *
+*/
+
+/*
+  Object: Options.Node
+
+  Provides Node rendering options for Tree and Graph based visualizations.
+
+  Syntax:
+    
+  (start code js)
+  Options.Node = {
+    overridable: false,
+    type: 'circle',
+    color: '#ccb',
+    alpha: 1,
+    dim: 3,
+    height: 20,
+    width: 90,
+    autoHeight: false,
+    autoWidth: false,
+    lineWidth: 1,
+    transform: true,
+    align: "center",
+    angularWidth:1,
+    span:1,
+    CanvasStyles: {}
+  };
+  (end code)
+  
+  Example:
+  
+  (start code js)
+  var viz = new $jit.Viz({
+    Node: {
+      overridable: true,
+      width: 30,
+      autoHeight: true,
+      type: 'rectangle'
+    }
+  });
+  (end code)
+  
+  Parameters:
+
+  overridable - (boolean) Default's *false*. Determine whether or not general node properties can be overridden by a particular <Graph.Node>.
+  type - (string) Default's *circle*. Node's shape. Node built-in types include 'circle', 'rectangle', 'square', 'ellipse', 'triangle', 'star'. The default Node type might vary in each visualization. You can also implement (non built-in) custom Node types into your visualizations.
+  color - (string) Default's *#ccb*. Node color.
+  alpha - (number) Default's *1*. The Node's alpha value. *1* is for full opacity.
+  dim - (number) Default's *3*. An extra parameter used by other node shapes such as circle or square, to determine the shape's diameter.
+  height - (number) Default's *20*. Used by 'rectangle' and 'ellipse' node types. The height of the node shape.
+  width - (number) Default's *90*. Used by 'rectangle' and 'ellipse' node types. The width of the node shape.
+  autoHeight - (boolean) Default's *false*. Whether to set an auto height for the node depending on the content of the Node's label.
+  autoWidth - (boolean) Default's *false*. Whether to set an auto width for the node depending on the content of the Node's label.
+  lineWidth - (number) Default's *1*. Used only by some Node shapes. The line width of the strokes of a node.
+  transform - (boolean) Default's *true*. Only used by the <Hypertree> visualization. Whether to scale the nodes according to the moebius transformation.
+  align - (string) Default's *center*. Possible values are 'center', 'left' or 'right'. Used only by the <ST> visualization, these parameters are used for aligning nodes when some of they dimensions vary.
+  angularWidth - (number) Default's *1*. Used in radial layouts (like <RGraph> or <Sunburst> visualizations). The amount of relative 'space' set for a node.
+  span - (number) Default's *1*. Used in radial layouts (like <RGraph> or <Sunburst> visualizations). The angle span amount set for a node.
+  CanvasStyles - (object) Default's an empty object (i.e. {}). Attach any other canvas specific property that you'd set to the canvas context before plotting a Node.
+
+*/
+Options.Node = {
+  $extend: false,
+  
+  overridable: false,
+  type: 'circle',
+  color: '#ccb',
+  alpha: 1,
+  dim: 3,
+  height: 20,
+  width: 90,
+  autoHeight: false,
+  autoWidth: false,
+  lineWidth: 1,
+  transform: true,
+  align: "center",
+  angularWidth:1,
+  span:1,
+  //Raw canvas styles to be
+  //applied to the context instance
+  //before plotting a node
+  CanvasStyles: {}
+};
+
+
+/*
+ * File: Options.Edge.js
+ *
+*/
+
+/*
+  Object: Options.Edge
+
+  Provides Edge rendering options for Tree and Graph based visualizations.
+
+  Syntax:
+    
+  (start code js)
+  Options.Edge = {
+    overridable: false,
+    type: 'line',
+    color: '#ccb',
+    lineWidth: 1,
+    dim:15,
+    alpha: 1,
+    CanvasStyles: {}
+  };
+  (end code)
+  
+  Example:
+  
+  (start code js)
+  var viz = new $jit.Viz({
+    Edge: {
+      overridable: true,
+      type: 'line',
+      color: '#fff',
+      CanvasStyles: {
+        shadowColor: '#ccc',
+        shadowBlur: 10
+      }
+    }
+  });
+  (end code)
+  
+  Parameters:
+    
+   overridable - (boolean) Default's *false*. Determine whether or not general edges properties can be overridden by a particular <Graph.Adjacence>.
+   type - (string) Default's 'line'. Edge styles include 'line', 'hyperline', 'arrow'. The default Edge type might vary in each visualization. You can also implement custom Edge types.
+   color - (string) Default's '#ccb'. Edge color.
+   lineWidth - (number) Default's *1*. Line/Edge width.
+   alpha - (number) Default's *1*. The Edge's alpha value. *1* is for full opacity.
+   dim - (number) Default's *15*. An extra parameter used by other complex shapes such as quadratic, bezier or arrow, to determine the shape's diameter.
+   epsilon - (number) Default's *7*. Only used when using *enableForEdges* in <Options.Events>. This dimension is used to create an area for the line where the contains method for the edge returns *true*.
+   CanvasStyles - (object) Default's an empty object (i.e. {}). Attach any other canvas specific property that you'd set to the canvas context before plotting an Edge.
+
+  See also:
+   
+   If you want to know more about how to customize Node/Edge data per element, in the JSON or programmatically, take a look at this article.
+*/
+Options.Edge = {
+  $extend: false,
+  
+  overridable: false,
+  type: 'line',
+  color: '#ccb',
+  lineWidth: 1,
+  dim:15,
+  alpha: 1,
+  epsilon: 7,
+
+  //Raw canvas styles to be
+  //applied to the context instance
+  //before plotting an edge
+  CanvasStyles: {}
+};
+
+
+/*
+ * File: Options.Fx.js
+ *
+*/
+
+/*
+  Object: Options.Fx
+
+  Provides animation options like duration of the animations, frames per second and animation transitions.  
+
+  Syntax:
+  
+  (start code js)
+    Options.Fx = {
+      fps:40,
+      duration: 2500,
+      transition: $jit.Trans.Quart.easeInOut,
+      clearCanvas: true
+    };
+  (end code)
+  
+  Example:
+  
+  (start code js)
+  var viz = new $jit.Viz({
+    duration: 1000,
+    fps: 35,
+    transition: $jit.Trans.linear
+  });
+  (end code)
+  
+  Parameters:
+  
+  clearCanvas - (boolean) Default's *true*. Whether to clear the frame/canvas when the viz is plotted or animated.
+  duration - (number) Default's *2500*. Duration of the animation in milliseconds.
+  fps - (number) Default's *40*. Frames per second.
+  transition - (object) Default's *$jit.Trans.Quart.easeInOut*. The transition used for the animations. See below for a more detailed explanation.
+  
+  Object: $jit.Trans
+  
+  This object is used for specifying different animation transitions in all visualizations.
+
+  There are many different type of animation transitions.
+
+  linear:
+
+  Displays a linear transition
+
+  >Trans.linear
+  
+  (see Linear.png)
+
+  Quad:
+
+  Displays a Quadratic transition.
+
+  >Trans.Quad.easeIn
+  >Trans.Quad.easeOut
+  >Trans.Quad.easeInOut
+  
+ (see Quad.png)
+
+ Cubic:
+
+ Displays a Cubic transition.
+
+ >Trans.Cubic.easeIn
+ >Trans.Cubic.easeOut
+ >Trans.Cubic.easeInOut
+
+ (see Cubic.png)
+
+ Quart:
+
+ Displays a Quartetic transition.
+
+ >Trans.Quart.easeIn
+ >Trans.Quart.easeOut
+ >Trans.Quart.easeInOut
+
+ (see Quart.png)
+
+ Quint:
+
+ Displays a Quintic transition.
+
+ >Trans.Quint.easeIn
+ >Trans.Quint.easeOut
+ >Trans.Quint.easeInOut
+
+ (see Quint.png)
+
+ Expo:
+
+ Displays an Exponential transition.
+
+ >Trans.Expo.easeIn
+ >Trans.Expo.easeOut
+ >Trans.Expo.easeInOut
+
+ (see Expo.png)
+
+ Circ:
+
+ Displays a Circular transition.
+
+ >Trans.Circ.easeIn
+ >Trans.Circ.easeOut
+ >Trans.Circ.easeInOut
+
+ (see Circ.png)
+
+ Sine:
+
+ Displays a Sineousidal transition.
+
+ >Trans.Sine.easeIn
+ >Trans.Sine.easeOut
+ >Trans.Sine.easeInOut
+
+ (see Sine.png)
+
+ Back:
+
+ >Trans.Back.easeIn
+ >Trans.Back.easeOut
+ >Trans.Back.easeInOut
+
+ (see Back.png)
+
+ Bounce:
+
+ Bouncy transition.
+
+ >Trans.Bounce.easeIn
+ >Trans.Bounce.easeOut
+ >Trans.Bounce.easeInOut
+
+ (see Bounce.png)
+
+ Elastic:
+
+ Elastic curve.
+
+ >Trans.Elastic.easeIn
+ >Trans.Elastic.easeOut
+ >Trans.Elastic.easeInOut
+
+ (see Elastic.png)
+ 
+ Based on:
+     
+ Easing and Transition animation methods are based in the MooTools Framework <http://mootools.net>. Copyright (c) 2006-2010 Valerio Proietti, <http://mad4milk.net/>. MIT license <http://mootools.net/license.txt>.
+
+
+*/
+Options.Fx = {
+  $extend: true,
+  
+  fps:40,
+  duration: 2500,
+  transition: $jit.Trans.Quart.easeInOut,
+  clearCanvas: true
+};
+
+/*
+ * File: Options.Label.js
+ *
+*/
+/*
+  Object: Options.Label
+
+  Provides styling for Labels such as font size, family, etc. Also sets Node labels as HTML, SVG or Native canvas elements.  
+
+  Syntax:
+  
+  (start code js)
+    Options.Label = {
+      overridable: false,
+      type: 'HTML', //'SVG', 'Native'
+      style: ' ',
+      size: 10,
+      family: 'sans-serif',
+      textAlign: 'center',
+      textBaseline: 'alphabetic',
+      color: '#fff'
+    };
+  (end code)
+  
+  Example:
+  
+  (start code js)
+  var viz = new $jit.Viz({
+    Label: {
+      type: 'Native',
+      size: 11,
+      color: '#ccc'
+    }
+  });
+  (end code)
+  
+  Parameters:
+    
+  overridable - (boolean) Default's *false*. Determine whether or not general label properties can be overridden by a particular <Graph.Node>.
+  type - (string) Default's *HTML*. The type for the labels. Can be 'HTML', 'SVG' or 'Native' canvas labels.
+  style - (string) Default's *empty string*. Can be 'italic' or 'bold'. This parameter is only taken into account when using 'Native' canvas labels. For DOM based labels the className *node* is added to the DOM element for styling via CSS. You can also use <Options.Controller> methods to style individual labels.
+  size - (number) Default's *10*. The font's size. This parameter is only taken into account when using 'Native' canvas labels. For DOM based labels the className *node* is added to the DOM element for styling via CSS. You can also use <Options.Controller> methods to style individual labels.
+  family - (string) Default's *sans-serif*. The font's family. This parameter is only taken into account when using 'Native' canvas labels. For DOM based labels the className *node* is added to the DOM element for styling via CSS. You can also use <Options.Controller> methods to style individual labels.
+  color - (string) Default's *#fff*. The font's color. This parameter is only taken into account when using 'Native' canvas labels. For DOM based labels the className *node* is added to the DOM element for styling via CSS. You can also use <Options.Controller> methods to style individual labels.
+*/
+Options.Label = {
+  $extend: false,
+  
+  overridable: false,
+  type: 'HTML', //'SVG', 'Native'
+  style: ' ',
+  size: 10,
+  family: 'sans-serif',
+  textAlign: 'center',
+  textBaseline: 'alphabetic',
+  color: '#fff'
+};
+
+
+/*
+ * File: Options.Tips.js
+ *
+ */
+
+/*
+  Object: Options.Tips
+  
+  Tips options
+  
+  Syntax:
+    
+  (start code js)
+  Options.Tips = {
+    enable: false,
+    type: 'auto',
+    offsetX: 20,
+    offsetY: 20,
+    onShow: $.empty,
+    onHide: $.empty
+  };
+  (end code)
+  
+  Example:
+  
+  (start code js)
+  var viz = new $jit.Viz({
+    Tips: {
+      enable: true,
+      type: 'Native',
+      offsetX: 10,
+      offsetY: 10,
+      onShow: function(tip, node) {
+        tip.innerHTML = node.name;
+      }
+    }
+  });
+  (end code)
+
+  Parameters:
+
+  enable - (boolean) Default's *false*. If *true*, a tooltip will be shown when a node is hovered. The tooltip is a div DOM element having "tip" as CSS class. 
+  type - (string) Default's *auto*. Defines where to attach the MouseEnter/Leave tooltip events. Possible values are 'Native' to attach them to the canvas or 'HTML' to attach them to DOM label elements (if defined). 'auto' sets this property to the value of <Options.Label>'s *type* property.
+  offsetX - (number) Default's *20*. An offset added to the current tooltip x-position (which is the same as the current mouse position). Default's 20.
+  offsetY - (number) Default's *20*. An offset added to the current tooltip y-position (which is the same as the current mouse position). Default's 20.
+  onShow(tip, node) - This callack is used right before displaying a tooltip. The first formal parameter is the tip itself (which is a DivElement). The second parameter may be a <Graph.Node> for graph based visualizations or an object with label, value properties for charts.
+  onHide() - This callack is used when hiding a tooltip.
+
+*/
+Options.Tips = {
+  $extend: false,
+  
+  enable: false,
+  type: 'auto',
+  offsetX: 20,
+  offsetY: 20,
+  force: false,
+  onShow: $.empty,
+  onHide: $.empty
+};
+
+
+/*
+ * File: Options.NodeStyles.js
+ *
+ */
+
+/*
+  Object: Options.NodeStyles
+  
+  Apply different styles when a node is hovered or selected.
+  
+  Syntax:
+    
+  (start code js)
+  Options.NodeStyles = {
+    enable: false,
+    type: 'auto',
+    stylesHover: false,
+    stylesClick: false
+  };
+  (end code)
+  
+  Example:
+  
+  (start code js)
+  var viz = new $jit.Viz({
+    NodeStyles: {
+      enable: true,
+      type: 'Native',
+      stylesHover: {
+        dim: 30,
+        color: '#fcc'
+      },
+      duration: 600
+    }
+  });
+  (end code)
+
+  Parameters:
+  
+  enable - (boolean) Default's *false*. Whether to enable this option.
+  type - (string) Default's *auto*. Use this to attach the hover/click events in the nodes or the nodes labels (if they have been defined as DOM elements: 'HTML' or 'SVG', see <Options.Label> for more details). The default 'auto' value will set NodeStyles to the same type defined for <Options.Label>.
+  stylesHover - (boolean|object) Default's *false*. An object with node styles just like the ones defined for <Options.Node> or *false* otherwise.
+  stylesClick - (boolean|object) Default's *false*. An object with node styles just like the ones defined for <Options.Node> or *false* otherwise.
+*/
+
+Options.NodeStyles = {
+  $extend: false,
+  
+  enable: false,
+  type: 'auto',
+  stylesHover: false,
+  stylesClick: false
+};
+
+
+/*
+ * File: Options.Events.js
+ *
+*/
+
+/*
+  Object: Options.Events
+  
+  Configuration for adding mouse/touch event handlers to Nodes.
+  
+  Syntax:
+  
+  (start code js)
+  Options.Events = {
+    enable: false,
+    enableForEdges: false,
+    type: 'auto',
+    onClick: $.empty,
+    onRightClick: $.empty,
+    onMouseMove: $.empty,
+    onMouseEnter: $.empty,
+    onMouseLeave: $.empty,
+    onDragStart: $.empty,
+    onDragMove: $.empty,
+    onDragCancel: $.empty,
+    onDragEnd: $.empty,
+    onTouchStart: $.empty,
+    onTouchMove: $.empty,
+    onTouchEnd: $.empty,
+    onTouchCancel: $.empty,
+    onMouseWheel: $.empty
+  };
+  (end code)
+  
+  Example:
+  
+  (start code js)
+  var viz = new $jit.Viz({
+    Events: {
+      enable: true,
+      onClick: function(node, eventInfo, e) {
+        viz.doSomething();
+      },
+      onMouseEnter: function(node, eventInfo, e) {
+        viz.canvas.getElement().style.cursor = 'pointer';
+      },
+      onMouseLeave: function(node, eventInfo, e) {
+        viz.canvas.getElement().style.cursor = '';
+      }
+    }
+  });
+  (end code)
+  
+  Parameters:
+  
+  enable - (boolean) Default's *false*. Whether to enable the Event system.
+  enableForEdges - (boolean) Default's *false*. Whether to track events also in arcs. If *true* the same callbacks -described below- are used for nodes *and* edges. A simple duck type check for edges is to check for *node.nodeFrom*.
+  type - (string) Default's 'auto'. Whether to attach the events onto the HTML labels (via event delegation) or to use the custom 'Native' canvas Event System of the library. 'auto' is set when you let the <Options.Label> *type* parameter decide this.
+  onClick(node, eventInfo, e) - Triggered when a user performs a click in the canvas. *node* is the <Graph.Node> clicked or false if no node has been clicked. *e* is the grabbed event (should return the native event in a cross-browser manner). *eventInfo* is an object containing useful methods like *getPos* to get the mouse position relative to the canvas. 
+  onRightClick(node, eventInfo, e) - Triggered when a user performs a right click in the canvas. *node* is the <Graph.Node> right clicked or false if no node has been clicked. *e* is the grabbed event (should return the native event in a cross-browser manner). *eventInfo* is an object containing useful methods like *getPos* to get the mouse position relative to the canvas. 
+  onMouseMove(node, eventInfo, e) - Triggered when the user moves the mouse. *node* is the <Graph.Node> under the cursor as it's moving over the canvas or false if no node has been clicked. *e* is the grabbed event (should return the native event in a cross-browser manner).  *eventInfo* is an object containing useful methods like *getPos* to get the mouse position relative to the canvas.
+  onMouseEnter(node, eventInfo, e) - Triggered when a user moves the mouse over a node. *node* is the <Graph.Node> that the mouse just entered. *e* is the grabbed event (should return the native event in a cross-browser manner). *eventInfo* is an object containing useful methods like *getPos* to get the mouse position relative to the canvas. 
+  onMouseLeave(node, eventInfo, e) - Triggered when the user mouse-outs a node. *node* is the <Graph.Node> 'mouse-outed'. *e* is the grabbed event (should return the native event in a cross-browser manner). *eventInfo* is an object containing useful methods like *getPos* to get the mouse position relative to the canvas. 
+  onDragStart(node, eventInfo, e) - Triggered when the user mouse-downs over a node. *node* is the <Graph.Node> being pressed. *e* is the grabbed event (should return the native event in a cross-browser manner). *eventInfo* is an object containing useful methods like *getPos* to get the mouse position relative to the canvas. 
+  onDragMove(node, eventInfo, e) - Triggered when a user, after pressing the mouse button over a node, moves the mouse around. *node* is the <Graph.Node> being dragged. *e* is the grabbed event (should return the native event in a cross-browser manner). *eventInfo* is an object containing useful methods like *getPos* to get the mouse position relative to the canvas. 
+  onDragEnd(node, eventInfo, e) - Triggered when a user finished dragging a node. *node* is the <Graph.Node> being dragged. *e* is the grabbed event (should return the native event in a cross-browser manner). *eventInfo* is an object containing useful methods like *getPos* to get the mouse position relative to the canvas. 
+  onDragCancel(node, eventInfo, e) - Triggered when the user releases the mouse button over a <Graph.Node> that wasn't dragged (i.e. the user didn't perform any mouse movement after pressing the mouse button). *node* is the <Graph.Node> being dragged. *e* is the grabbed event (should return the native event in a cross-browser manner). *eventInfo* is an object containing useful methods like *getPos* to get the mouse position relative to the canvas. 
+  onTouchStart(node, eventInfo, e) - Behaves just like onDragStart. 
+  onTouchMove(node, eventInfo, e) - Behaves just like onDragMove. 
+  onTouchEnd(node, eventInfo, e) - Behaves just like onDragEnd. 
+  onTouchCancel(node, eventInfo, e) - Behaves just like onDragCancel.
+  onMouseWheel(delta, e) - Triggered when the user uses the mouse scroll over the canvas. *delta* is 1 or -1 depending on the sense of the mouse scroll.
+*/
+
+Options.Events = {
+  $extend: false,
+  
+  enable: false,
+  enableForEdges: false,
+  type: 'auto',
+  onClick: $.empty,
+  onRightClick: $.empty,
+  onMouseMove: $.empty,
+  onMouseEnter: $.empty,
+  onMouseLeave: $.empty,
+  onDragStart: $.empty,
+  onDragMove: $.empty,
+  onDragCancel: $.empty,
+  onDragEnd: $.empty,
+  onTouchStart: $.empty,
+  onTouchMove: $.empty,
+  onTouchEnd: $.empty,
+  onMouseWheel: $.empty
+};
+
+/*
+ * File: Options.Navigation.js
+ *
+*/
+
+/*
+  Object: Options.Navigation
+  
+  Panning and zooming options for Graph/Tree based visualizations. These options are implemented 
+  by all visualizations except charts (<AreaChart>, <BarChart> and <PieChart>).
+  
+  Syntax:
+  
+  (start code js)
+
+  Options.Navigation = {
+    enable: false,
+    type: 'auto',
+    panning: false, //true, 'avoid nodes'
+    zooming: false
+  };
+  
+  (end code)
+  
+  Example:
+    
+  (start code js)
+  var viz = new $jit.Viz({
+    Navigation: {
+      enable: true,
+      panning: 'avoid nodes',
+      zooming: 20
+    }
+  });
+  (end code)
+  
+  Parameters:
+  
+  enable - (boolean) Default's *false*. Whether to enable Navigation capabilities.
+  panning - (boolean|string) Default's *false*. Set this property to *true* if you want to add Drag and Drop panning support to the visualization. You can also set this parameter to 'avoid nodes' to enable DnD panning but disable it if the DnD is taking place over a node. This is useful when some other events like Drag & Drop for nodes are added to <Graph.Nodes>.
+  zooming - (boolean|number) Default's *false*. Set this property to a numeric value to turn mouse-scroll zooming on. The number will be proportional to the mouse-scroll sensitivity.
+  
+*/
+
+Options.Navigation = {
+  $extend: false,
+  
+  enable: false,
+  type: 'auto',
+  panning: false, //true | 'avoid nodes'
+  zooming: false
+};
+
+/*
+ * File: Options.Controller.js
+ *
+*/
+
+/*
+  Object: Options.Controller
+  
+  Provides controller methods. Controller methods are callback functions that get called at different stages 
+  of the animation, computing or plotting of the visualization.
+  
+  Implemented by:
+    
+  All visualizations except charts (<AreaChart>, <BarChart> and <PieChart>).
+  
+  Syntax:
+  
+  (start code js)
+
+  Options.Controller = {
+    onBeforeCompute: $.empty,
+    onAfterCompute:  $.empty,
+    onCreateLabel:   $.empty,
+    onPlaceLabel:    $.empty,
+    onComplete:      $.empty,
+    onBeforePlotLine:$.empty,
+    onAfterPlotLine: $.empty,
+    onBeforePlotNode:$.empty,
+    onAfterPlotNode: $.empty,
+    request:         false
+  };
+  
+  (end code)
+  
+  Example:
+    
+  (start code js)
+  var viz = new $jit.Viz({
+    onBeforePlotNode: function(node) {
+      if(node.selected) {
+        node.setData('color', '#ffc');
+      } else {
+        node.removeData('color');
+      }
+    },
+    onBeforePlotLine: function(adj) {
+      if(adj.nodeFrom.selected && adj.nodeTo.selected) {
+        adj.setData('color', '#ffc');
+      } else {
+        adj.removeData('color');
+      }
+    },
+    onAfterCompute: function() {
+      alert("computed!");
+    }
+  });
+  (end code)
+  
+  Parameters:
+
+   onBeforeCompute(node) - This method is called right before performing all computations and animations. The selected <Graph.Node> is passed as parameter.
+   onAfterCompute() - This method is triggered after all animations or computations ended.
+   onCreateLabel(domElement, node) - This method receives a new label DIV element as first parameter, and the corresponding <Graph.Node> as second parameter. This method will only be called once for each label. This method is useful when adding events or styles to the labels used by the JIT.
+   onPlaceLabel(domElement, node) - This method receives a label DIV element as first parameter and the corresponding <Graph.Node> as second parameter. This method is called each time a label has been placed in the visualization, for example at each step of an animation, and thus it allows you to update the labels properties, such as size or position. Note that onPlaceLabel will be triggered after updating the labels positions. That means that, for example, the left and top css properties are already updated to match the nodes positions. Width and height properties are not set however.
+   onBeforePlotNode(node) - This method is triggered right before plotting each <Graph.Node>. This method is useful for changing a node style right before plotting it.
+   onAfterPlotNode(node) - This method is triggered right after plotting each <Graph.Node>.
+   onBeforePlotLine(adj) - This method is triggered right before plotting a <Graph.Adjacence>. This method is useful for adding some styles to a particular edge before being plotted.
+   onAfterPlotLine(adj) - This method is triggered right after plotting a <Graph.Adjacence>.
+
+    *Used in <ST>, <TM.Base> and <Icicle> visualizations*
+    
+    request(nodeId, level, onComplete) - This method is used for buffering information into the visualization. When clicking on an empty node, the visualization will make a request for this node's subtrees, specifying a given level for this subtree (defined by _levelsToShow_). Once the request is completed, the onComplete callback should be called with the given result. This is useful to provide on-demand information into the visualizations withought having to load the entire information from start. The parameters used by this method are _nodeId_, which is the id of the root of the subtree to request, _level_ which is the depth of the subtree to be requested (0 would mean just the root node). _onComplete_ is an object having the callback method _onComplete.onComplete(json)_ that should be called once the json has been retrieved.  
+ 
+ */
+Options.Controller = {
+  $extend: true,
+  
+  onBeforeCompute: $.empty,
+  onAfterCompute:  $.empty,
+  onCreateLabel:   $.empty,
+  onPlaceLabel:    $.empty,
+  onComplete:      $.empty,
+  onBeforePlotLine:$.empty,
+  onAfterPlotLine: $.empty,
+  onBeforePlotNode:$.empty,
+  onAfterPlotNode: $.empty,
+  request:         false
+};
+
+
+/*
+ * File: Extras.js
+ * 
+ * Provides Extras such as Tips and Style Effects.
+ * 
+ * Description:
+ * 
+ * Provides the <Tips> and <NodeStyles> classes and functions.
+ *
+ */
+
+/*
+ * Manager for mouse events (clicking and mouse moving).
+ * 
+ * This class is used for registering objects implementing onClick
+ * and onMousemove methods. These methods are called when clicking or
+ * moving the mouse around  the Canvas.
+ * For now, <Tips> and <NodeStyles> are classes implementing these methods.
+ * 
+ */
+var ExtrasInitializer = {
+  initialize: function(className, viz) {
+    this.viz = viz;
+    this.canvas = viz.canvas;
+    this.config = viz.config[className];
+    this.nodeTypes = viz.fx.nodeTypes;
+    var type = this.config.type;
+    this.dom = type == 'auto'? (viz.config.Label.type != 'Native') : (type != 'Native');
+    this.labelContainer = this.dom && viz.labels.getLabelContainer();
+    this.isEnabled() && this.initializePost();
+  },
+  initializePost: $.empty,
+  setAsProperty: $.lambda(false),
+  isEnabled: function() {
+    return this.config.enable;
+  },
+  isLabel: function(e, win) {
+    e = $.event.get(e, win);
+    var labelContainer = this.labelContainer,
+        target = e.target || e.srcElement;
+    if(target && target.parentNode == labelContainer)
+      return target;
+    return false;
+  }
+};
+
+var EventsInterface = {
+  onMouseUp: $.empty,
+  onMouseDown: $.empty,
+  onMouseMove: $.empty,
+  onMouseOver: $.empty,
+  onMouseOut: $.empty,
+  onMouseWheel: $.empty,
+  onTouchStart: $.empty,
+  onTouchMove: $.empty,
+  onTouchEnd: $.empty,
+  onTouchCancel: $.empty
+};
+
+var MouseEventsManager = new Class({
+  initialize: function(viz) {
+    this.viz = viz;
+    this.canvas = viz.canvas;
+    this.node = false;
+    this.edge = false;
+    this.registeredObjects = [];
+    this.attachEvents();
+  },
+  
+  attachEvents: function() {
+    var htmlCanvas = this.canvas.getElement(), 
+        that = this;
+    htmlCanvas.oncontextmenu = $.lambda(false);
+    $.addEvents(htmlCanvas, {
+      'mouseup': function(e, win) {
+        var event = $.event.get(e, win);
+        that.handleEvent('MouseUp', e, win, 
+            that.makeEventObject(e, win), 
+            $.event.isRightClick(event));
+      },
+      'mousedown': function(e, win) {
+        var event = $.event.get(e, win);
+        that.handleEvent('MouseDown', e, win, that.makeEventObject(e, win), 
+            $.event.isRightClick(event));
+      },
+      'mousemove': function(e, win) {
+        that.handleEvent('MouseMove', e, win, that.makeEventObject(e, win));
+      },
+      'mouseover': function(e, win) {
+        that.handleEvent('MouseOver', e, win, that.makeEventObject(e, win));
+      },
+      'mouseout': function(e, win) {
+        that.handleEvent('MouseOut', e, win, that.makeEventObject(e, win));
+      },
+      'touchstart': function(e, win) {
+        that.handleEvent('TouchStart', e, win, that.makeEventObject(e, win));
+      },
+      'touchmove': function(e, win) {
+        that.handleEvent('TouchMove', e, win, that.makeEventObject(e, win));
+      },
+      'touchend': function(e, win) {
+        that.handleEvent('TouchEnd', e, win, that.makeEventObject(e, win));
+      }
+    });
+    //attach mousewheel event
+    var handleMouseWheel = function(e, win) {
+      var event = $.event.get(e, win);
+      var wheel = $.event.getWheel(event);
+      that.handleEvent('MouseWheel', e, win, wheel);
+    };
+    //TODO(nico): this is a horrible check for non-gecko browsers!
+    if(!document.getBoxObjectFor && window.mozInnerScreenX == null) {
+      $.addEvent(htmlCanvas, 'mousewheel', handleMouseWheel);
+    } else {
+      htmlCanvas.addEventListener('DOMMouseScroll', handleMouseWheel, false);
+    }
+  },
+  
+  register: function(obj) {
+    this.registeredObjects.push(obj);
+  },
+  
+  handleEvent: function() {
+    var args = Array.prototype.slice.call(arguments),
+        type = args.shift();
+    for(var i=0, regs=this.registeredObjects, l=regs.length; i<l; i++) {
+      regs[i]['on' + type].apply(regs[i], args);
+    }
+  },
+  
+  makeEventObject: function(e, win) {
+    var that = this,
+        graph = this.viz.graph,
+        fx = this.viz.fx,
+        ntypes = fx.nodeTypes,
+        etypes = fx.edgeTypes;
+    return {
+      pos: false,
+      node: false,
+      edge: false,
+      contains: false,
+      getNodeCalled: false,
+      getEdgeCalled: false,
+      getPos: function() {
+        //TODO(nico): check why this can't be cache anymore when using edge detection
+        //if(this.pos) return this.pos;
+        var canvas = that.viz.canvas,
+            s = canvas.getSize(),
+            p = canvas.getPos(),
+            ox = canvas.translateOffsetX,
+            oy = canvas.translateOffsetY,
+            sx = canvas.scaleOffsetX,
+            sy = canvas.scaleOffsetY,
+            pos = $.event.getPos(e, win);
+        this.pos = {
+          x: (pos.x - p.x - s.width/2 - ox) * 1/sx,
+          y: (pos.y - p.y - s.height/2 - oy) * 1/sy
+        };
+        return this.pos;
+      },
+      getNode: function() {
+        if(this.getNodeCalled) return this.node;
+        this.getNodeCalled = true;
+        for(var id in graph.nodes) {
+          var n = graph.nodes[id],
+              geom = n && ntypes[n.getData('type')],
+              contains = geom && geom.contains && geom.contains.call(fx, n, this.getPos());
+          if(contains) {
+            this.contains = contains;
+            return that.node = this.node = n;
+          }
+        }
+        return that.node = this.node = false;
+      },
+      getEdge: function() {
+        if(this.getEdgeCalled) return this.edge;
+        this.getEdgeCalled = true;
+        var hashset = {};
+        for(var id in graph.edges) {
+          var edgeFrom = graph.edges[id];
+          hashset[id] = true;
+          for(var edgeId in edgeFrom) {
+            if(edgeId in hashset) continue;
+            var e = edgeFrom[edgeId],
+                geom = e && etypes[e.getData('type')],
+                contains = geom && geom.contains && geom.contains.call(fx, e, this.getPos());
+            if(contains) {
+              this.contains = contains;
+              return that.edge = this.edge = e;
+            }
+          }
+        }
+        return that.edge = this.edge = false;
+      },
+      getContains: function() {
+        if(this.getNodeCalled) return this.contains;
+        this.getNode();
+        return this.contains;
+      }
+    };
+  }
+});
+
+/* 
+ * Provides the initialization function for <NodeStyles> and <Tips> implemented 
+ * by all main visualizations.
+ *
+ */
+var Extras = {
+  initializeExtras: function() {
+    var mem = new MouseEventsManager(this), that = this;
+    $.each(['NodeStyles', 'Tips', 'Navigation', 'Events'], function(k) {
+      var obj = new Extras.Classes[k](k, that);
+      if(obj.isEnabled()) {
+        mem.register(obj);
+      }
+      if(obj.setAsProperty()) {
+        that[k.toLowerCase()] = obj;
+      }
+    });
+  }   
+};
+
+Extras.Classes = {};
+/*
+  Class: Events
+   
+  This class defines an Event API to be accessed by the user.
+  The methods implemented are the ones defined in the <Options.Events> object.
+*/
+
+Extras.Classes.Events = new Class({
+  Implements: [ExtrasInitializer, EventsInterface],
+  
+  initializePost: function() {
+    this.fx = this.viz.fx;
+    this.ntypes = this.viz.fx.nodeTypes;
+    this.etypes = this.viz.fx.edgeTypes;
+    
+    this.hovered = false;
+    this.pressed = false;
+    this.touched = false;
+
+    this.touchMoved = false;
+    this.moved = false;
+    
+  },
+  
+  setAsProperty: $.lambda(true),
+  
+  onMouseUp: function(e, win, event, isRightClick) {
+    var evt = $.event.get(e, win);
+    if(!this.moved) {
+      if(isRightClick) {
+        this.config.onRightClick(this.hovered, event, evt);
+      } else {
+        this.config.onClick(this.pressed, event, evt);
+      }
+    }
+    if(this.pressed) {
+      if(this.moved) {
+        this.config.onDragEnd(this.pressed, event, evt);
+      } else {
+        this.config.onDragCancel(this.pressed, event, evt);
+      }
+      this.pressed = this.moved = false;
+    }
+  },
+
+  onMouseOut: function(e, win, event) {
+   //mouseout a label
+   var evt = $.event.get(e, win), label;
+   if(this.dom && (label = this.isLabel(e, win))) {
+     this.config.onMouseLeave(this.viz.graph.getNode(label.id),
+                              event, evt);
+     this.hovered = false;
+     return;
+   }
+   //mouseout canvas
+   var rt = evt.relatedTarget,
+       canvasWidget = this.canvas.getElement();
+   while(rt && rt.parentNode) {
+     if(canvasWidget == rt.parentNode) return;
+     rt = rt.parentNode;
+   }
+   if(this.hovered) {
+     this.config.onMouseLeave(this.hovered,
+         event, evt);
+     this.hovered = false;
+   }
+  },
+  
+  onMouseOver: function(e, win, event) {
+    //mouseover a label
+    var evt = $.event.get(e, win), label;
+    if(this.dom && (label = this.isLabel(e, win))) {
+      this.hovered = this.viz.graph.getNode(label.id);
+      this.config.onMouseEnter(this.hovered,
+                               event, evt);
+    }
+  },
+  
+  onMouseMove: function(e, win, event) {
+   var label, evt = $.event.get(e, win);
+   if(this.pressed) {
+     this.moved = true;
+     this.config.onDragMove(this.pressed, event, evt);
+     return;
+   }
+   if(this.dom) {
+     this.config.onMouseMove(this.hovered,
+         event, evt);
+   } else {
+     if(this.hovered) {
+       var hn = this.hovered;
+       var geom = hn.nodeFrom? this.etypes[hn.getData('type')] : this.ntypes[hn.getData('type')];
+       var contains = geom && geom.contains 
+         && geom.contains.call(this.fx, hn, event.getPos());
+       if(contains) {
+         this.config.onMouseMove(hn, event, evt);
+         return;
+       } else {
+         this.config.onMouseLeave(hn, event, evt);
+         this.hovered = false;
+       }
+     }
+     if(this.hovered = (event.getNode() || (this.config.enableForEdges && event.getEdge()))) {
+       this.config.onMouseEnter(this.hovered, event, evt);
+     } else {
+       this.config.onMouseMove(false, event, evt);
+     }
+   }
+  },
+  
+  onMouseWheel: function(e, win, delta) {
+    this.config.onMouseWheel(delta, $.event.get(e, win));
+  },
+  
+  onMouseDown: function(e, win, event) {
+    var evt = $.event.get(e, win);
+    this.pressed = event.getNode() || (this.config.enableForEdges && event.getEdge());
+    this.config.onDragStart(this.pressed, event, evt);
+  },
+  
+  onTouchStart: function(e, win, event) {
+    var evt = $.event.get(e, win);
+    this.touched = event.getNode() || (this.config.enableForEdges && event.getEdge());
+    this.config.onTouchStart(this.touched, event, evt);
+  },
+  
+  onTouchMove: function(e, win, event) {
+    var evt = $.event.get(e, win);
+    if(this.touched) {
+      this.touchMoved = true;
+      this.config.onTouchMove(this.touched, event, evt);
+    }
+  },
+  
+  onTouchEnd: function(e, win, event) {
+    var evt = $.event.get(e, win);
+    if(this.touched) {
+      if(this.touchMoved) {
+        this.config.onTouchEnd(this.touched, event, evt);
+      } else {
+        this.config.onTouchCancel(this.touched, event, evt);
+      }
+      this.touched = this.touchMoved = false;
+    }
+  }
+});
+
+/*
+   Class: Tips
+    
+   A class containing tip related functions. This class is used internally.
+   
+   Used by:
+   
+   <ST>, <Sunburst>, <Hypertree>, <RGraph>, <TM>, <ForceDirected>, <Icicle>
+   
+   See also:
+   
+   <Options.Tips>
+*/
+
+Extras.Classes.Tips = new Class({
+  Implements: [ExtrasInitializer, EventsInterface],
+  
+  initializePost: function() {
+    //add DOM tooltip
+    if(document.body) {
+      var tip = $('_tooltip') || document.createElement('div');
+      tip.id = '_tooltip';
+      tip.className = 'tip';
+      $.extend(tip.style, {
+        position: 'absolute',
+        display: 'none',
+        zIndex: 13000
+      });
+      document.body.appendChild(tip);
+      this.tip = tip;
+      this.node = false;
+    }
+  },
+  
+  setAsProperty: $.lambda(true),
+  
+  onMouseOut: function(e, win) {
+    //mouseout a label
+    if(this.dom && this.isLabel(e, win)) {
+      this.hide(true);
+      return;
+    }
+    //mouseout canvas
+    var rt = e.relatedTarget,
+        canvasWidget = this.canvas.getElement();
+    while(rt && rt.parentNode) {
+      if(canvasWidget == rt.parentNode) return;
+      rt = rt.parentNode;
+    }
+    this.hide(false);
+  },
+  
+  onMouseOver: function(e, win) {
+    //mouseover a label
+    var label;
+    if(this.dom && (label = this.isLabel(e, win))) {
+      this.node = this.viz.graph.getNode(label.id);
+      this.config.onShow(this.tip, this.node, label);
+    }
+  },
+  
+  onMouseMove: function(e, win, opt) {
+    if(this.dom && this.isLabel(e, win)) {
+      this.setTooltipPosition($.event.getPos(e, win));
+    }
+    if(!this.dom) {
+      var node = opt.getNode();
+      if(!node) {
+        this.hide(true);
+        return;
+      }
+      if(this.config.force || !this.node || this.node.id != node.id) {
+        this.node = node;
+        this.config.onShow(this.tip, node, opt.getContains());
+      }
+      this.setTooltipPosition($.event.getPos(e, win));
+    }
+  },
+  
+  setTooltipPosition: function(pos) {
+    var tip = this.tip, 
+        style = tip.style, 
+        cont = this.config;
+    style.display = '';
+    //get window dimensions
+    var win = {
+      'height': document.body.clientHeight,
+      'width': document.body.clientWidth
+    };
+    //get tooltip dimensions
+    var obj = {
+      'width': tip.offsetWidth,
+      'height': tip.offsetHeight  
+    };
+    //set tooltip position
+    var x = cont.offsetX, y = cont.offsetY;
+    style.top = ((pos.y + y + obj.height > win.height)?  
+        (pos.y - obj.height - y) : pos.y + y) + 'px';
+    style.left = ((pos.x + obj.width + x > win.width)? 
+        (pos.x - obj.width - x) : pos.x + x) + 'px';
+  },
+  
+  hide: function(triggerCallback) {
+    this.tip.style.display = 'none';
+    triggerCallback && this.config.onHide();
+  }
+});
+
+/*
+  Class: NodeStyles
+   
+  Change node styles when clicking or hovering a node. This class is used internally.
+  
+  Used by:
+  
+  <ST>, <Sunburst>, <Hypertree>, <RGraph>, <TM>, <ForceDirected>, <Icicle>
+  
+  See also:
+  
+  <Options.NodeStyles>
+*/
+Extras.Classes.NodeStyles = new Class({
+  Implements: [ExtrasInitializer, EventsInterface],
+  
+  initializePost: function() {
+    this.fx = this.viz.fx;
+    this.types = this.viz.fx.nodeTypes;
+    this.nStyles = this.config;
+    this.nodeStylesOnHover = this.nStyles.stylesHover;
+    this.nodeStylesOnClick = this.nStyles.stylesClick;
+    this.hoveredNode = false;
+    this.fx.nodeFxAnimation = new Animation();
+    
+    this.down = false;
+    this.move = false;
+  },
+  
+  onMouseOut: function(e, win) {
+    this.down = this.move = false;
+    if(!this.hoveredNode) return;
+    //mouseout a label
+    if(this.dom && this.isLabel(e, win)) {
+      this.toggleStylesOnHover(this.hoveredNode, false);
+    }
+    //mouseout canvas
+    var rt = e.relatedTarget,
+        canvasWidget = this.canvas.getElement();
+    while(rt && rt.parentNode) {
+      if(canvasWidget == rt.parentNode) return;
+      rt = rt.parentNode;
+    }
+    this.toggleStylesOnHover(this.hoveredNode, false);
+    this.hoveredNode = false;
+  },
+  
+  onMouseOver: function(e, win) {
+    //mouseover a label
+    var label;
+    if(this.dom && (label = this.isLabel(e, win))) {
+      var node = this.viz.graph.getNode(label.id);
+      if(node.selected) return;
+      this.hoveredNode = node;
+      this.toggleStylesOnHover(this.hoveredNode, true);
+    }
+  },
+  
+  onMouseDown: function(e, win, event, isRightClick) {
+    if(isRightClick) return;
+    var label;
+    if(this.dom && (label = this.isLabel(e, win))) {
+      this.down = this.viz.graph.getNode(label.id);
+    } else if(!this.dom) {
+      this.down = event.getNode();
+    }
+    this.move = false;
+  },
+  
+  onMouseUp: function(e, win, event, isRightClick) {
+    if(isRightClick) return;
+    if(!this.move) {
+      this.onClick(event.getNode());
+    }
+    this.down = this.move = false;
+  },
+  
+  getRestoredStyles: function(node, type) {
+    var restoredStyles = {}, 
+        nStyles = this['nodeStylesOn' + type];
+    for(var prop in nStyles) {
+      restoredStyles[prop] = node.styles['$' + prop];
+    }
+    return restoredStyles;
+  },
+  
+  toggleStylesOnHover: function(node, set) {
+    if(this.nodeStylesOnHover) {
+      this.toggleStylesOn('Hover', node, set);
+    }
+  },
+
+  toggleStylesOnClick: function(node, set) {
+    if(this.nodeStylesOnClick) {
+      this.toggleStylesOn('Click', node, set);
+    }
+  },
+  
+  toggleStylesOn: function(type, node, set) {
+    var viz = this.viz;
+    var nStyles = this.nStyles;
+    if(set) {
+      var that = this;
+      if(!node.styles) {
+        node.styles = $.merge(node.data, {});
+      }
+      for(var s in this['nodeStylesOn' + type]) {
+        var $s = '$' + s;
+        if(!($s in node.styles)) {
+            node.styles[$s] = node.getData(s); 
+        }
+      }
+      viz.fx.nodeFx($.extend({
+        'elements': {
+          'id': node.id,
+          'properties': that['nodeStylesOn' + type]
+         },
+         transition: Trans.Quart.easeOut,
+         duration:300,
+         fps:40
+      }, this.config));
+    } else {
+      var restoredStyles = this.getRestoredStyles(node, type);
+      viz.fx.nodeFx($.extend({
+        'elements': {
+          'id': node.id,
+          'properties': restoredStyles
+         },
+         transition: Trans.Quart.easeOut,
+         duration:300,
+         fps:40
+      }, this.config));
+    }
+  },
+
+  onClick: function(node) {
+    if(!node) return;
+    var nStyles = this.nodeStylesOnClick;
+    if(!nStyles) return;
+    //if the node is selected then unselect it
+    if(node.selected) {
+      this.toggleStylesOnClick(node, false);
+      delete node.selected;
+    } else {
+      //unselect all selected nodes...
+      this.viz.graph.eachNode(function(n) {
+        if(n.selected) {
+          for(var s in nStyles) {
+            n.setData(s, n.styles['$' + s], 'end');
+          }
+          delete n.selected;
+        }
+      });
+      //select clicked node
+      this.toggleStylesOnClick(node, true);
+      node.selected = true;
+      delete node.hovered;
+      this.hoveredNode = false;
+    }
+  },
+  
+  onMouseMove: function(e, win, event) {
+    //if mouse button is down and moving set move=true
+    if(this.down) this.move = true;
+    //already handled by mouseover/out
+    if(this.dom && this.isLabel(e, win)) return;
+    var nStyles = this.nodeStylesOnHover;
+    if(!nStyles) return;
+    
+    if(!this.dom) {
+      if(this.hoveredNode) {
+        var geom = this.types[this.hoveredNode.getData('type')];
+        var contains = geom && geom.contains && geom.contains.call(this.fx, 
+            this.hoveredNode, event.getPos());
+        if(contains) return;
+      }
+      var node = event.getNode();
+      //if no node is being hovered then just exit
+      if(!this.hoveredNode && !node) return;
+      //if the node is hovered then exit
+      if(node.hovered) return;
+      //select hovered node
+      if(node && !node.selected) {
+        //check if an animation is running and exit it
+        this.fx.nodeFxAnimation.stopTimer();
+        //unselect all hovered nodes...
+        this.viz.graph.eachNode(function(n) {
+          if(n.hovered && !n.selected) {
+            for(var s in nStyles) {
+              n.setData(s, n.styles['$' + s], 'end');
+            }
+            delete n.hovered;
+          }
+        });
+        //select hovered node
+        node.hovered = true;
+        this.hoveredNode = node;
+        this.toggleStylesOnHover(node, true);
+      } else if(this.hoveredNode && !this.hoveredNode.selected) {
+        //check if an animation is running and exit it
+        this.fx.nodeFxAnimation.stopTimer();
+        //unselect hovered node
+        this.toggleStylesOnHover(this.hoveredNode, false);
+        delete this.hoveredNode.hovered;
+        this.hoveredNode = false;
+      }
+    }
+  }
+});
+
+Extras.Classes.Navigation = new Class({
+  Implements: [ExtrasInitializer, EventsInterface],
+  
+  initializePost: function() {
+    this.pos = false;
+    this.pressed = false;
+  },
+  
+  onMouseWheel: function(e, win, scroll) {
+    if(!this.config.zooming) return;
+    $.event.stop($.event.get(e, win));
+    var val = this.config.zooming / 1000,
+        ans = 1 + scroll * val;
+    this.canvas.scale(ans, ans);
+  },
+  
+  onMouseDown: function(e, win, eventInfo) {
+    if(!this.config.panning) return;
+    if(this.config.panning == 'avoid nodes' && eventInfo.getNode()) return;
+    this.pressed = true;
+    this.pos = eventInfo.getPos();
+    var canvas = this.canvas,
+        ox = canvas.translateOffsetX,
+        oy = canvas.translateOffsetY,
+        sx = canvas.scaleOffsetX,
+        sy = canvas.scaleOffsetY;
+    this.pos.x *= sx;
+    this.pos.x += ox;
+    this.pos.y *= sy;
+    this.pos.y += oy;
+  },
+  
+  onMouseMove: function(e, win, eventInfo) {
+    if(!this.config.panning) return;
+    if(!this.pressed) return;
+    if(this.config.panning == 'avoid nodes' && eventInfo.getNode()) return;
+    var thispos = this.pos, 
+        currentPos = eventInfo.getPos(),
+        canvas = this.canvas,
+        ox = canvas.translateOffsetX,
+        oy = canvas.translateOffsetY,
+        sx = canvas.scaleOffsetX,
+        sy = canvas.scaleOffsetY;
+    currentPos.x *= sx;
+    currentPos.y *= sy;
+    currentPos.x += ox;
+    currentPos.y += oy;
+    var x = currentPos.x - thispos.x,
+        y = currentPos.y - thispos.y;
+    this.pos = currentPos;
+    this.canvas.translate(x * 1/sx, y * 1/sy);
+  },
+  
+  onMouseUp: function(e, win, eventInfo, isRightClick) {
+    if(!this.config.panning) return;
+    this.pressed = false;
+  }
+});
+
+
+/*
+ * File: Canvas.js
+ *
+ */
+
+/*
+ Class: Canvas
+ 
+ 	A canvas widget used by all visualizations. The canvas object can be accessed by doing *viz.canvas*. If you want to 
+ 	know more about <Canvas> options take a look at <Options.Canvas>.
+ 
+ A canvas widget is a set of DOM elements that wrap the native canvas DOM Element providing a consistent API and behavior 
+ across all browsers. It can also include Elements to add DOM (SVG or HTML) label support to all visualizations.
+ 
+ Example:
+ 
+ Suppose we have this HTML
+ 
+ (start code xml)
+ 	<div id="infovis"></div>
+ (end code)
+ 
+ Now we create a new Visualization
+ 
+ (start code js)
+ 	var viz = new $jit.Viz({
+ 		//Where to inject the canvas. Any div container will do.
+ 		'injectInto':'infovis',
+		 //width and height for canvas. 
+		 //Default's to the container offsetWidth and Height.
+		 'width': 900,
+		 'height':500
+	 });
+ (end code)
+
+ The generated HTML will look like this
+ 
+ (start code xml)
+ <div id="infovis">
+ 	<div id="infovis-canvaswidget" style="position:relative;">
+ 	<canvas id="infovis-canvas" width=900 height=500
+ 	style="position:absolute; top:0; left:0; width:900px; height:500px;" />
+ 	<div id="infovis-label"
+ 	style="overflow:visible; position:absolute; top:0; left:0; width:900px; height:0px">
+ 	</div>
+ 	</div>
+ </div>
+ (end code)
+ 
+ As you can see, the generated HTML consists of a canvas DOM Element of id *infovis-canvas* and a div label container
+ of id *infovis-label*, wrapped in a main div container of id *infovis-canvaswidget*.
+ */
+
+var Canvas;
+(function() {
+  //check for native canvas support
+  var canvasType = typeof HTMLCanvasElement,
+      supportsCanvas = (canvasType == 'object' || canvasType == 'function');
+  //create element function
+  function $E(tag, props) {
+    var elem = document.createElement(tag);
+    for(var p in props) {
+      if(typeof props[p] == "object") {
+        $.extend(elem[p], props[p]);
+      } else {
+        elem[p] = props[p];
+      }
+    }
+    if (tag == "canvas" && !supportsCanvas && G_vmlCanvasManager) {
+      elem = G_vmlCanvasManager.initElement(document.body.appendChild(elem));
+    }
+    return elem;
+  }
+  //canvas widget which we will call just Canvas
+  $jit.Canvas = Canvas = new Class({
+    canvases: [],
+    pos: false,
+    element: false,
+    labelContainer: false,
+    translateOffsetX: 0,
+    translateOffsetY: 0,
+    scaleOffsetX: 1,
+    scaleOffsetY: 1,
+    
+    initialize: function(viz, opt) {
+      this.viz = viz;
+      this.opt = opt;
+      var id = $.type(opt.injectInto) == 'string'? 
+          opt.injectInto:opt.injectInto.id,
+          idLabel = id + "-label", 
+          wrapper = $(id),
+          width = opt.width || wrapper.offsetWidth,
+          height = opt.height || wrapper.offsetHeight;
+      this.id = id;
+      //canvas options
+      var canvasOptions = {
+        injectInto: id,
+        width: width,
+        height: height
+      };
+      //create main wrapper
+      this.element = $E('div', {
+        'id': id + '-canvaswidget',
+        'style': {
+          'position': 'relative',
+          'width': width + 'px',
+          'height': height + 'px'
+        }
+      });
+      //create label container
+      this.labelContainer = this.createLabelContainer(opt.Label.type, 
+          idLabel, canvasOptions);
+      //create primary canvas
+      this.canvases.push(new Canvas.Base({
+        config: $.extend({idSuffix: '-canvas'}, canvasOptions),
+        plot: function(base) {
+          viz.fx.plot();
+        },
+        resize: function() {
+          viz.refresh();
+        }
+      }));
+      //create secondary canvas
+      var back = opt.background;
+      if(back) {
+        var backCanvas = new Canvas.Background[back.type](viz, $.extend(back, canvasOptions));
+        this.canvases.push(new Canvas.Base(backCanvas));
+      }
+      //insert canvases
+      var len = this.canvases.length;
+      while(len--) {
+        this.element.appendChild(this.canvases[len].canvas);
+        if(len > 0) {
+          this.canvases[len].plot();
+        }
+      }
+      this.element.appendChild(this.labelContainer);
+      wrapper.appendChild(this.element);
+      //Update canvas position when the page is scrolled.
+      var timer = null, that = this;
+      $.addEvent(window, 'scroll', function() {
+        clearTimeout(timer);
+        timer = setTimeout(function() {
+          that.getPos(true); //update canvas position
+        }, 500);
+      });
+    },
+    /*
+      Method: getCtx
+      
+      Returns the main canvas context object
+      
+      Example:
+      
+      (start code js)
+       var ctx = canvas.getCtx();
+       //Now I can use the native canvas context
+       //and for example change some canvas styles
+       ctx.globalAlpha = 1;
+      (end code)
+    */
+    getCtx: function(i) {
+      return this.canvases[i || 0].getCtx();
+    },
+    /*
+      Method: getConfig
+      
+      Returns the current Configuration for this Canvas Widget.
+      
+      Example:
+      
+      (start code js)
+       var config = canvas.getConfig();
+      (end code)
+    */
+    getConfig: function() {
+      return this.opt;
+    },
+    /*
+      Method: getElement
+
+      Returns the main Canvas DOM wrapper
+      
+      Example:
+      
+      (start code js)
+       var wrapper = canvas.getElement();
+       //Returns <div id="infovis-canvaswidget" ... >...</div> as element
+      (end code)
+    */
+    getElement: function() {
+      return this.element;
+    },
+    /*
+      Method: getSize
+      
+      Returns canvas dimensions.
+      
+      Returns:
+      
+      An object with *width* and *height* properties.
+      
+      Example:
+      (start code js)
+      canvas.getSize(); //returns { width: 900, height: 500 }
+      (end code)
+    */
+    getSize: function(i) {
+      return this.canvases[i || 0].getSize();
+    },
+    /*
+      Method: resize
+      
+      Resizes the canvas.
+      
+      Parameters:
+      
+      width - New canvas width.
+      height - New canvas height.
+      
+      Example:
+      
+      (start code js)
+       canvas.resize(width, height);
+      (end code)
+    
+    */
+    resize: function(width, height) {
+      this.getPos(true);
+      this.translateOffsetX = this.translateOffsetY = 0;
+      this.scaleOffsetX = this.scaleOffsetY = 1;
+      for(var i=0, l=this.canvases.length; i<l; i++) {
+        this.canvases[i].resize(width, height);
+      }
+      var style = this.element.style;
+      style.width = width + 'px';
+      style.height = height + 'px';
+      if(this.labelContainer)
+        this.labelContainer.style.width = width + 'px';
+    },
+    /*
+      Method: translate
+      
+      Applies a translation to the canvas.
+      
+      Parameters:
+      
+      x - (number) x offset.
+      y - (number) y offset.
+      disablePlot - (boolean) Default's *false*. Set this to *true* if you don't want to refresh the visualization.
+      
+      Example:
+      
+      (start code js)
+       canvas.translate(30, 30);
+      (end code)
+    
+    */
+    translate: function(x, y, disablePlot) {
+      this.translateOffsetX += x*this.scaleOffsetX;
+      this.translateOffsetY += y*this.scaleOffsetY;
+      for(var i=0, l=this.canvases.length; i<l; i++) {
+        this.canvases[i].translate(x, y, disablePlot);
+      }
+    },
+    /*
+      Method: scale
+      
+      Scales the canvas.
+      
+      Parameters:
+      
+      x - (number) scale value.
+      y - (number) scale value.
+      disablePlot - (boolean) Default's *false*. Set this to *true* if you don't want to refresh the visualization.
+      
+      Example:
+      
+      (start code js)
+       canvas.scale(0.5, 0.5);
+      (end code)
+    
+    */
+    scale: function(x, y, disablePlot) {
+      var px = this.scaleOffsetX * x,
+          py = this.scaleOffsetY * y;
+      var dx = this.translateOffsetX * (x -1) / px,
+          dy = this.translateOffsetY * (y -1) / py;
+      this.scaleOffsetX = px;
+      this.scaleOffsetY = py;
+      for(var i=0, l=this.canvases.length; i<l; i++) {
+        this.canvases[i].scale(x, y, true);
+      }
+      this.translate(dx, dy, false);
+    },
+    /*
+      Method: getPos
+      
+      Returns the canvas position as an *x, y* object.
+      
+      Parameters:
+      
+      force - (boolean) Default's *false*. Set this to *true* if you want to recalculate the position without using any cache information.
+      
+      Returns:
+      
+      An object with *x* and *y* properties.
+      
+      Example:
+      (start code js)
+      canvas.getPos(true); //returns { x: 900, y: 500 }
+      (end code)
+    */
+    getPos: function(force){
+      if(force || !this.pos) {
+        return this.pos = $.getPos(this.getElement());
+      }
+      return this.pos;
+    },
+    /*
+       Method: clear
+       
+       Clears the canvas.
+    */
+    clear: function(i){
+      this.canvases[i||0].clear();
+    },
+    
+    path: function(type, action){
+      var ctx = this.canvases[0].getCtx();
+      ctx.beginPath();
+      action(ctx);
+      ctx[type]();
+      ctx.closePath();
+    },
+    
+    createLabelContainer: function(type, idLabel, dim) {
+      var NS = 'http://www.w3.org/2000/svg';
+      if(type == 'HTML' || type == 'Native') {
+        return $E('div', {
+          'id': idLabel,
+          'style': {
+            'overflow': 'visible',
+            'position': 'absolute',
+            'top': 0,
+            'left': 0,
+            'width': dim.width + 'px',
+            'height': 0
+          }
+        });
+      } else if(type == 'SVG') {
+        var svgContainer = document.createElementNS(NS, 'svg:svg');
+        svgContainer.setAttribute("width", dim.width);
+        svgContainer.setAttribute('height', dim.height);
+        var style = svgContainer.style;
+        style.position = 'absolute';
+        style.left = style.top = '0px';
+        var labelContainer = document.createElementNS(NS, 'svg:g');
+        labelContainer.setAttribute('width', dim.width);
+        labelContainer.setAttribute('height', dim.height);
+        labelContainer.setAttribute('x', 0);
+        labelContainer.setAttribute('y', 0);
+        labelContainer.setAttribute('id', idLabel);
+        svgContainer.appendChild(labelContainer);
+        return svgContainer;
+      }
+    }
+  });
+  //base canvas wrapper
+  Canvas.Base = new Class({
+    translateOffsetX: 0,
+    translateOffsetY: 0,
+    scaleOffsetX: 1,
+    scaleOffsetY: 1,
+
+    initialize: function(viz) {
+      this.viz = viz;
+      this.opt = viz.config;
+      this.size = false;
+      this.createCanvas();
+      this.translateToCenter();
+    },
+    createCanvas: function() {
+      var opt = this.opt,
+          width = opt.width,
+          height = opt.height;
+      this.canvas = $E('canvas', {
+        'id': opt.injectInto + opt.idSuffix,
+        'width': width,
+        'height': height,
+        'style': {
+          'position': 'absolute',
+          'top': 0,
+          'left': 0,
+          'width': width + 'px',
+          'height': height + 'px'
+        }
+      });
+    },
+    getCtx: function() {
+      if(!this.ctx) 
+        return this.ctx = this.canvas.getContext('2d');
+      return this.ctx;
+    },
+    getSize: function() {
+      if(this.size) return this.size;
+      var canvas = this.canvas;
+      return this.size = {
+        width: canvas.width,
+        height: canvas.height
+      };
+    },
+    translateToCenter: function(ps) {
+      var size = this.getSize(),
+          width = ps? (size.width - ps.width - this.translateOffsetX*2) : size.width;
+          height = ps? (size.height - ps.height - this.translateOffsetY*2) : size.height;
+      var ctx = this.getCtx();
+      ps && ctx.scale(1/this.scaleOffsetX, 1/this.scaleOffsetY);
+      ctx.translate(width/2, height/2);
+    },
+    resize: function(width, height) {
+      var size = this.getSize(),
+          canvas = this.canvas,
+          styles = canvas.style;
+      this.size = false;
+      canvas.width = width;
+      canvas.height = height;
+      styles.width = width + "px";
+      styles.height = height + "px";
+      //small ExCanvas fix
+      if(!supportsCanvas) {
+        this.translateToCenter(size);
+      } else {
+        this.translateToCenter();
+      }
+      this.translateOffsetX =
+        this.translateOffsetY = 0;
+      this.scaleOffsetX = 
+        this.scaleOffsetY = 1;
+      this.clear();
+      this.viz.resize(width, height, this);
+    },
+    translate: function(x, y, disablePlot) {
+      var sx = this.scaleOffsetX,
+          sy = this.scaleOffsetY;
+      this.translateOffsetX += x*sx;
+      this.translateOffsetY += y*sy;
+      this.getCtx().translate(x, y);
+      !disablePlot && this.plot();
+    },
+    scale: function(x, y, disablePlot) {
+      this.scaleOffsetX *= x;
+      this.scaleOffsetY *= y;
+      this.getCtx().scale(x, y);
+      !disablePlot && this.plot();
+    },
+    clear: function(){
+      var size = this.getSize(),
+          ox = this.translateOffsetX,
+          oy = this.translateOffsetY,
+          sx = this.scaleOffsetX,
+          sy = this.scaleOffsetY;
+      this.getCtx().clearRect((-size.width / 2 - ox) * 1/sx, 
+                              (-size.height / 2 - oy) * 1/sy, 
+                              size.width * 1/sx, size.height * 1/sy);
+    },
+    plot: function() {
+      this.clear();
+      this.viz.plot(this);
+    }
+  });
+  //background canvases
+  //TODO(nico): document this!
+  Canvas.Background = {};
+  Canvas.Background.Circles = new Class({
+    initialize: function(viz, options) {
+      this.viz = viz;
+      this.config = $.merge({
+        idSuffix: '-bkcanvas',
+        levelDistance: 100,
+        numberOfCircles: 6,
+        CanvasStyles: {},
+        offset: 0
+      }, options);
+    },
+    resize: function(width, height, base) {
+      this.plot(base);
+    },
+    plot: function(base) {
+      var canvas = base.canvas,
+          ctx = base.getCtx(),
+          conf = this.config,
+          styles = conf.CanvasStyles;
+      //set canvas styles
+      for(var s in styles) ctx[s] = styles[s];
+      var n = conf.numberOfCircles,
+          rho = conf.levelDistance;
+      for(var i=1; i<=n; i++) {
+        ctx.beginPath();
+        ctx.arc(0, 0, rho * i, 0, 2 * Math.PI, false);
+        ctx.stroke();
+        ctx.closePath();
+      }
+      //TODO(nico): print labels too!
+    }
+  });
+})();
+
+
+/*
+ * File: Polar.js
+ * 
+ * Defines the <Polar> class.
+ *
+ * Description:
+ *
+ * The <Polar> class, just like the <Complex> class, is used by the <Hypertree>, <ST> and <RGraph> as a 2D point representation.
+ *
+ * See also:
+ *
+ * <http://en.wikipedia.org/wiki/Polar_coordinates>
+ *
+*/
+
+/*
+   Class: Polar
+
+   A multi purpose polar representation.
+
+   Description:
+ 
+   The <Polar> class, just like the <Complex> class, is used by the <Hypertree>, <ST> and <RGraph> as a 2D point representation.
+ 
+   See also:
+ 
+   <http://en.wikipedia.org/wiki/Polar_coordinates>
+ 
+   Parameters:
+
+      theta - An angle.
+      rho - The norm.
+*/
+
+var Polar = function(theta, rho) {
+  this.theta = theta;
+  this.rho = rho;
+};
+
+$jit.Polar = Polar;
+
+Polar.prototype = {
+    /*
+       Method: getc
+    
+       Returns a complex number.
+    
+       Parameters:
+
+       simple - _optional_ If *true*, this method will return only an object holding x and y properties and not a <Complex> instance. Default's *false*.
+
+      Returns:
+    
+          A complex number.
+    */
+    getc: function(simple) {
+        return this.toComplex(simple);
+    },
+
+    /*
+       Method: getp
+    
+       Returns a <Polar> representation.
+    
+       Returns:
+    
+          A variable in polar coordinates.
+    */
+    getp: function() {
+        return this;
+    },
+
+
+    /*
+       Method: set
+    
+       Sets a number.
+
+       Parameters:
+
+       v - A <Complex> or <Polar> instance.
+    
+    */
+    set: function(v) {
+        v = v.getp();
+        this.theta = v.theta; this.rho = v.rho;
+    },
+
+    /*
+       Method: setc
+    
+       Sets a <Complex> number.
+
+       Parameters:
+
+       x - A <Complex> number real part.
+       y - A <Complex> number imaginary part.
+    
+    */
+    setc: function(x, y) {
+        this.rho = Math.sqrt(x * x + y * y);
+        this.theta = Math.atan2(y, x);
+        if(this.theta < 0) this.theta += Math.PI * 2;
+    },
+
+    /*
+       Method: setp
+    
+       Sets a polar number.
+
+       Parameters:
+
+       theta - A <Polar> number angle property.
+       rho - A <Polar> number rho property.
+    
+    */
+    setp: function(theta, rho) {
+        this.theta = theta; 
+        this.rho = rho;
+    },
+
+    /*
+       Method: clone
+    
+       Returns a copy of the current object.
+    
+       Returns:
+    
+          A copy of the real object.
+    */
+    clone: function() {
+        return new Polar(this.theta, this.rho);
+    },
+
+    /*
+       Method: toComplex
+    
+        Translates from polar to cartesian coordinates and returns a new <Complex> instance.
+    
+        Parameters:
+
+        simple - _optional_ If *true* this method will only return an object with x and y properties (and not the whole <Complex> instance). Default's *false*.
+ 
+        Returns:
+    
+          A new <Complex> instance.
+    */
+    toComplex: function(simple) {
+        var x = Math.cos(this.theta) * this.rho;
+        var y = Math.sin(this.theta) * this.rho;
+        if(simple) return { 'x': x, 'y': y};
+        return new Complex(x, y);
+    },
+
+    /*
+       Method: add
+    
+        Adds two <Polar> instances.
+    
+       Parameters:
+
+       polar - A <Polar> number.
+
+       Returns:
+    
+          A new Polar instance.
+    */
+    add: function(polar) {
+        return new Polar(this.theta + polar.theta, this.rho + polar.rho);
+    },
+    
+    /*
+       Method: scale
+    
+        Scales a polar norm.
+    
+        Parameters:
+
+        number - A scale factor.
+        
+        Returns:
+    
+          A new Polar instance.
+    */
+    scale: function(number) {
+        return new Polar(this.theta, this.rho * number);
+    },
+    
+    /*
+       Method: equals
+    
+       Comparison method.
+
+       Returns *true* if the theta and rho properties are equal.
+
+       Parameters:
+
+       c - A <Polar> number.
+
+       Returns:
+
+       *true* if the theta and rho parameters for these objects are equal. *false* otherwise.
+    */
+    equals: function(c) {
+        return this.theta == c.theta && this.rho == c.rho;
+    },
+    
+    /*
+       Method: $add
+    
+        Adds two <Polar> instances affecting the current object.
+    
+       Paramters:
+
+       polar - A <Polar> instance.
+
+       Returns:
+    
+          The changed object.
+    */
+    $add: function(polar) {
+        this.theta = this.theta + polar.theta; this.rho += polar.rho;
+        return this;
+    },
+
+    /*
+       Method: $madd
+    
+        Adds two <Polar> instances affecting the current object. The resulting theta angle is modulo 2pi.
+    
+       Parameters:
+
+       polar - A <Polar> instance.
+
+       Returns:
+    
+          The changed object.
+    */
+    $madd: function(polar) {
+        this.theta = (this.theta + polar.theta) % (Math.PI * 2); this.rho += polar.rho;
+        return this;
+    },
+
+    
+    /*
+       Method: $scale
+    
+        Scales a polar instance affecting the object.
+    
+      Parameters:
+
+      number - A scaling factor.
+
+      Returns:
+    
+          The changed object.
+    */
+    $scale: function(number) {
+        this.rho *= number;
+        return this;
+    },
+    
+    /*
+       Method: interpolate
+    
+        Calculates a polar interpolation between two points at a given delta moment.
+
+        Parameters:
+      
+        elem - A <Polar> instance.
+        delta - A delta factor ranging [0, 1].
+    
+       Returns:
+    
+          A new <Polar> instance representing an interpolation between _this_ and _elem_
+    */
+    interpolate: function(elem, delta) {
+        var pi = Math.PI, pi2 = pi * 2;
+        var ch = function(t) {
+            var a =  (t < 0)? (t % pi2) + pi2 : t % pi2;
+            return a;
+        };
+        var tt = this.theta, et = elem.theta;
+        var sum, diff = Math.abs(tt - et);
+        if(diff == pi) {
+          if(tt > et) {
+            sum = ch((et + ((tt - pi2) - et) * delta)) ;
+          } else {
+            sum = ch((et - pi2 + (tt - (et)) * delta));
+          }
+        } else if(diff >= pi) {
+          if(tt > et) {
+            sum = ch((et + ((tt - pi2) - et) * delta)) ;
+          } else {
+            sum = ch((et - pi2 + (tt - (et - pi2)) * delta));
+          }
+        } else {  
+          sum = ch((et + (tt - et) * delta)) ;
+        }
+        var r = (this.rho - elem.rho) * delta + elem.rho;
+        return {
+          'theta': sum,
+          'rho': r
+        };
+    }
+};
+
+
+var $P = function(a, b) { return new Polar(a, b); };
+
+Polar.KER = $P(0, 0);
+
+
+
+/*
+ * File: Complex.js
+ * 
+ * Defines the <Complex> class.
+ *
+ * Description:
+ *
+ * The <Complex> class, just like the <Polar> class, is used by the <Hypertree>, <ST> and <RGraph> as a 2D point representation.
+ *
+ * See also:
+ *
+ * <http://en.wikipedia.org/wiki/Complex_number>
+ *
+*/
+
+/*
+   Class: Complex
+    
+   A multi-purpose Complex Class with common methods.
+ 
+   Description:
+ 
+   The <Complex> class, just like the <Polar> class, is used by the <Hypertree>, <ST> and <RGraph> as a 2D point representation.
+ 
+   See also:
+ 
+   <http://en.wikipedia.org/wiki/Complex_number>
+
+   Parameters:
+
+   x - _optional_ A Complex number real part.
+   y - _optional_ A Complex number imaginary part.
+ 
+*/
+
+var Complex = function(x, y) {
+  this.x = x;
+  this.y = y;
+};
+
+$jit.Complex = Complex;
+
+Complex.prototype = {
+    /*
+       Method: getc
+    
+       Returns a complex number.
+    
+       Returns:
+    
+          A complex number.
+    */
+    getc: function() {
+        return this;
+    },
+
+    /*
+       Method: getp
+    
+       Returns a <Polar> representation of this number.
+    
+       Parameters:
+
+       simple - _optional_ If *true*, this method will return only an object holding theta and rho properties and not a <Polar> instance. Default's *false*.
+
+       Returns:
+    
+          A variable in <Polar> coordinates.
+    */
+    getp: function(simple) {
+        return this.toPolar(simple);
+    },
+
+
+    /*
+       Method: set
+    
+       Sets a number.
+
+       Parameters:
+
+       c - A <Complex> or <Polar> instance.
+    
+    */
+    set: function(c) {
+      c = c.getc(true);
+      this.x = c.x; 
+      this.y = c.y;
+    },
+
+    /*
+       Method: setc
+    
+       Sets a complex number.
+
+       Parameters:
+
+       x - A <Complex> number Real part.
+       y - A <Complex> number Imaginary part.
+    
+    */
+    setc: function(x, y) {
+        this.x = x; 
+        this.y = y;
+    },
+
+    /*
+       Method: setp
+    
+       Sets a polar number.
+
+       Parameters:
+
+       theta - A <Polar> number theta property.
+       rho - A <Polar> number rho property.
+    
+    */
+    setp: function(theta, rho) {
+        this.x = Math.cos(theta) * rho;
+        this.y = Math.sin(theta) * rho;
+    },
+
+    /*
+       Method: clone
+    
+       Returns a copy of the current object.
+    
+       Returns:
+    
+          A copy of the real object.
+    */
+    clone: function() {
+        return new Complex(this.x, this.y);
+    },
+
+    /*
+       Method: toPolar
+    
+       Transforms cartesian to polar coordinates.
+    
+       Parameters:
+
+       simple - _optional_ If *true* this method will only return an object with theta and rho properties (and not the whole <Polar> instance). Default's *false*.
+       
+       Returns:
+    
+          A new <Polar> instance.
+    */
+    
+    toPolar: function(simple) {
+        var rho = this.norm();
+        var atan = Math.atan2(this.y, this.x);
+        if(atan < 0) atan += Math.PI * 2;
+        if(simple) return { 'theta': atan, 'rho': rho };
+        return new Polar(atan, rho);
+    },
+    /*
+       Method: norm
+    
+       Calculates a <Complex> number norm.
+    
+       Returns:
+    
+          A real number representing the complex norm.
+    */
+    norm: function () {
+        return Math.sqrt(this.squaredNorm());
+    },
+    
+    /*
+       Method: squaredNorm
+    
+       Calculates a <Complex> number squared norm.
+    
+       Returns:
+    
+          A real number representing the complex squared norm.
+    */
+    squaredNorm: function () {
+        return this.x*this.x + this.y*this.y;
+    },
+
+    /*
+       Method: add
+    
+       Returns the result of adding two complex numbers.
+       
+       Does not alter the original object.
+
+       Parameters:
+    
+          pos - A <Complex> instance.
+    
+       Returns:
+    
+         The result of adding two complex numbers.
+    */
+    add: function(pos) {
+        return new Complex(this.x + pos.x, this.y + pos.y);
+    },
+
+    /*
+       Method: prod
+    
+       Returns the result of multiplying two <Complex> numbers.
+       
+       Does not alter the original object.
+
+       Parameters:
+    
+          pos - A <Complex> instance.
+    
+       Returns:
+    
+         The result of multiplying two complex numbers.
+    */
+    prod: function(pos) {
+        return new Complex(this.x*pos.x - this.y*pos.y, this.y*pos.x + this.x*pos.y);
+    },
+
+    /*
+       Method: conjugate
+    
+       Returns the conjugate of this <Complex> number.
+
+       Does not alter the original object.
+
+       Returns:
+    
+         The conjugate of this <Complex> number.
+    */
+    conjugate: function() {
+        return new Complex(this.x, -this.y);
+    },
+
+
+    /*
+       Method: scale
+    
+       Returns the result of scaling a <Complex> instance.
+       
+       Does not alter the original object.
+
+       Parameters:
+    
+          factor - A scale factor.
+    
+       Returns:
+    
+         The result of scaling this complex to a factor.
+    */
+    scale: function(factor) {
+        return new Complex(this.x * factor, this.y * factor);
+    },
+
+    /*
+       Method: equals
+    
+       Comparison method.
+
+       Returns *true* if both real and imaginary parts are equal.
+
+       Parameters:
+
+       c - A <Complex> instance.
+
+       Returns:
+
+       A boolean instance indicating if both <Complex> numbers are equal.
+    */
+    equals: function(c) {
+        return this.x == c.x && this.y == c.y;
+    },
+
+    /*
+       Method: $add
+    
+       Returns the result of adding two <Complex> numbers.
+       
+       Alters the original object.
+
+       Parameters:
+    
+          pos - A <Complex> instance.
+    
+       Returns:
+    
+         The result of adding two complex numbers.
+    */
+    $add: function(pos) {
+        this.x += pos.x; this.y += pos.y;
+        return this;    
+    },
+    
+    /*
+       Method: $prod
+    
+       Returns the result of multiplying two <Complex> numbers.
+       
+       Alters the original object.
+
+       Parameters:
+    
+          pos - A <Complex> instance.
+    
+       Returns:
+    
+         The result of multiplying two complex numbers.
+    */
+    $prod:function(pos) {
+        var x = this.x, y = this.y;
+        this.x = x*pos.x - y*pos.y;
+        this.y = y*pos.x + x*pos.y;
+        return this;
+    },
+    
+    /*
+       Method: $conjugate
+    
+       Returns the conjugate for this <Complex>.
+       
+       Alters the original object.
+
+       Returns:
+    
+         The conjugate for this complex.
+    */
+    $conjugate: function() {
+        this.y = -this.y;
+        return this;
+    },
+    
+    /*
+       Method: $scale
+    
+       Returns the result of scaling a <Complex> instance.
+       
+       Alters the original object.
+
+       Parameters:
+    
+          factor - A scale factor.
+    
+       Returns:
+    
+         The result of scaling this complex to a factor.
+    */
+    $scale: function(factor) {
+        this.x *= factor; this.y *= factor;
+        return this;
+    },
+    
+    /*
+       Method: $div
+    
+       Returns the division of two <Complex> numbers.
+       
+       Alters the original object.
+
+       Parameters:
+    
+          pos - A <Complex> number.
+    
+       Returns:
+    
+         The result of scaling this complex to a factor.
+    */
+    $div: function(pos) {
+        var x = this.x, y = this.y;
+        var sq = pos.squaredNorm();
+        this.x = x * pos.x + y * pos.y; this.y = y * pos.x - x * pos.y;
+        return this.$scale(1 / sq);
+    }
+};
+
+var $C = function(a, b) { return new Complex(a, b); };
+
+Complex.KER = $C(0, 0);
+
+
+
+/*
+ * File: Graph.js
+ *
+*/
+
+/*
+ Class: Graph
+
+ A Graph Class that provides useful manipulation functions. You can find more manipulation methods in the <Graph.Util> object.
+
+ An instance of this class can be accessed by using the *graph* parameter of any tree or graph visualization.
+ 
+ Example:
+
+ (start code js)
+   //create new visualization
+   var viz = new $jit.Viz(options);
+   //load JSON data
+   viz.loadJSON(json);
+   //access model
+   viz.graph; //<Graph> instance
+ (end code)
+ 
+ Implements:
+ 
+ The following <Graph.Util> methods are implemented in <Graph>
+ 
+  - <Graph.Util.getNode>
+  - <Graph.Util.eachNode>
+  - <Graph.Util.computeLevels>
+  - <Graph.Util.eachBFS>
+  - <Graph.Util.clean>
+  - <Graph.Util.getClosestNodeToPos>
+  - <Graph.Util.getClosestNodeToOrigin>
+ 
+*/  
+
+$jit.Graph = new Class({
+
+  initialize: function(opt, Node, Edge, Label) {
+    var innerOptions = {
+    'complex': false,
+    'Node': {}
+    };
+    this.Node = Node;
+    this.Edge = Edge;
+    this.Label = Label;
+    this.opt = $.merge(innerOptions, opt || {});
+    this.nodes = {};
+    this.edges = {};
+    
+    //add nodeList methods
+    var that = this;
+    this.nodeList = {};
+    for(var p in Accessors) {
+      that.nodeList[p] = (function(p) {
+        return function() {
+          var args = Array.prototype.slice.call(arguments);
+          that.eachNode(function(n) {
+            n[p].apply(n, args);
+          });
+        };
+      })(p);
+    }
+
+ },
+
+/*
+     Method: getNode
+    
+     Returns a <Graph.Node> by *id*.
+
+     Parameters:
+
+     id - (string) A <Graph.Node> id.
+
+     Example:
+
+     (start code js)
+       var node = graph.getNode('nodeId');
+     (end code)
+*/  
+ getNode: function(id) {
+    if(this.hasNode(id)) return this.nodes[id];
+    return false;
+ },
+
+ /*
+   Method: getByName
+  
+   Returns a <Graph.Node> by *name*.
+  
+   Parameters:
+  
+   name - (string) A <Graph.Node> name.
+  
+   Example:
+  
+   (start code js)
+     var node = graph.getByName('someName');
+   (end code)
+  */  
+  getByName: function(name) {
+    for(var id in this.nodes) {
+      var n = this.nodes[id];
+      if(n.name == name) return n;
+    }
+    return false;
+  },
+
+/*
+   Method: getAdjacence
+  
+   Returns a <Graph.Adjacence> object connecting nodes with ids *id* and *id2*.
+
+   Parameters:
+
+   id - (string) A <Graph.Node> id.
+   id2 - (string) A <Graph.Node> id.
+*/  
+  getAdjacence: function (id, id2) {
+    if(id in this.edges) {
+      return this.edges[id][id2];
+    }
+    return false;
+ },
+
+    /*
+     Method: addNode
+    
+     Adds a node.
+     
+     Parameters:
+    
+      obj - An object with the properties described below
+
+      id - (string) A node id
+      name - (string) A node's name
+      data - (object) A node's data hash
+
+    See also:
+    <Graph.Node>
+
+  */  
+  addNode: function(obj) { 
+   if(!this.nodes[obj.id]) {  
+     var edges = this.edges[obj.id] = {};
+     this.nodes[obj.id] = new Graph.Node($.extend({
+        'id': obj.id,
+        'name': obj.name,
+        'data': $.merge(obj.data || {}, {}),
+        'adjacencies': edges 
+      }, this.opt.Node), 
+      this.opt.complex, 
+      this.Node, 
+      this.Edge,
+      this.Label);
+    }
+    return this.nodes[obj.id];
+  },
+  
+    /*
+     Method: addAdjacence
+    
+     Connects nodes specified by *obj* and *obj2*. If not found, nodes are created.
+     
+     Parameters:
+    
+      obj - (object) A <Graph.Node> object.
+      obj2 - (object) Another <Graph.Node> object.
+      data - (object) A data object. Used to store some extra information in the <Graph.Adjacence> object created.
+
+    See also:
+
+    <Graph.Node>, <Graph.Adjacence>
+    */  
+  addAdjacence: function (obj, obj2, data) {
+    if(!this.hasNode(obj.id)) { this.addNode(obj); }
+    if(!this.hasNode(obj2.id)) { this.addNode(obj2); }
+    obj = this.nodes[obj.id]; obj2 = this.nodes[obj2.id];
+    if(!obj.adjacentTo(obj2)) {
+      var adjsObj = this.edges[obj.id] = this.edges[obj.id] || {};
+      var adjsObj2 = this.edges[obj2.id] = this.edges[obj2.id] || {};
+      adjsObj[obj2.id] = adjsObj2[obj.id] = new Graph.Adjacence(obj, obj2, data, this.Edge, this.Label);
+      return adjsObj[obj2.id];
+    }
+    return this.edges[obj.id][obj2.id];
+ },
+
+    /*
+     Method: removeNode
+    
+     Removes a <Graph.Node> matching the specified *id*.
+
+     Parameters:
+
+     id - (string) A node's id.
+
+    */  
+  removeNode: function(id) {
+    if(this.hasNode(id)) {
+      delete this.nodes[id];
+      var adjs = this.edges[id];
+      for(var to in adjs) {
+        delete this.edges[to][id];
+      }
+      delete this.edges[id];
+    }
+  },
+  
+/*
+     Method: removeAdjacence
+    
+     Removes a <Graph.Adjacence> matching *id1* and *id2*.
+
+     Parameters:
+
+     id1 - (string) A <Graph.Node> id.
+     id2 - (string) A <Graph.Node> id.
+*/  
+  removeAdjacence: function(id1, id2) {
+    delete this.edges[id1][id2];
+    delete this.edges[id2][id1];
+  },
+
+   /*
+     Method: hasNode
+    
+     Returns a boolean indicating if the node belongs to the <Graph> or not.
+     
+     Parameters:
+    
+        id - (string) Node id.
+   */  
+  hasNode: function(id) {
+    return id in this.nodes;
+  },
+  
+  /*
+    Method: empty
+
+    Empties the Graph
+
+  */
+  empty: function() { this.nodes = {}; this.edges = {};}
+
+});
+
+var Graph = $jit.Graph;
+
+/*
+ Object: Accessors
+ 
+ Defines a set of methods for data, canvas and label styles manipulation implemented by <Graph.Node> and <Graph.Adjacence> instances.
+ 
+ */
+var Accessors;
+
+(function () {
+  var getDataInternal = function(prefix, prop, type, force, prefixConfig) {
+    var data;
+    type = type || 'current';
+    prefix = "$" + (prefix ? prefix + "-" : "");
+
+    if(type == 'current') {
+      data = this.data;
+    } else if(type == 'start') {
+      data = this.startData;
+    } else if(type == 'end') {
+      data = this.endData;
+    }
+
+    var dollar = prefix + prop;
+
+    if(force) {
+      return data[dollar];
+    }
+
+    if(!this.Config.overridable)
+      return prefixConfig[prop] || 0;
+
+    return (dollar in data) ?
+      data[dollar] : ((dollar in this.data) ? this.data[dollar] : (prefixConfig[prop] || 0));
+  }
+
+  var setDataInternal = function(prefix, prop, value, type) {
+    type = type || 'current';
+    prefix = '$' + (prefix ? prefix + '-' : '');
+
+    var data;
+
+    if(type == 'current') {
+      data = this.data;
+    } else if(type == 'start') {
+      data = this.startData;
+    } else if(type == 'end') {
+      data = this.endData;
+    }
+
+    data[prefix + prop] = value;
+  }
+
+  var removeDataInternal = function(prefix, properties) {
+    prefix = '$' + (prefix ? prefix + '-' : '');
+    var that = this;
+    $.each(properties, function(prop) {
+      var pref = prefix + prop;
+      delete that.data[pref];
+      delete that.endData[pref];
+      delete that.startData[pref];
+    });
+  }
+
+  Accessors = {
+    /*
+    Method: getData
+
+    Returns the specified data value property.
+    This is useful for querying special/reserved <Graph.Node> data properties
+    (i.e dollar prefixed properties).
+
+    Parameters:
+
+      prop  - (string) The name of the property. The dollar sign is not needed. For
+              example *getData(width)* will return *data.$width*.
+      type  - (string) The type of the data property queried. Default's "current". You can access *start* and *end* 
+              data properties also. These properties are used when making animations.
+      force - (boolean) Whether to obtain the true value of the property (equivalent to
+              *data.$prop*) or to check for *node.overridable = true* first.
+
+    Returns:
+
+      The value of the dollar prefixed property or the global Node/Edge property
+      value if *overridable=false*
+
+    Example:
+    (start code js)
+     node.getData('width'); //will return node.data.$width if Node.overridable=true;
+    (end code)
+    */
+    getData: function(prop, type, force) {
+      return getDataInternal.call(this, "", prop, type, force, this.Config);
+    },
+
+
+    /*
+    Method: setData
+
+    Sets the current data property with some specific value.
+    This method is only useful for reserved (dollar prefixed) properties.
+
+    Parameters:
+
+      prop  - (string) The name of the property. The dollar sign is not necessary. For
+              example *setData(width)* will set *data.$width*.
+      value - (mixed) The value to store.
+      type  - (string) The type of the data property to store. Default's "current" but
+              can also be "start" or "end".
+
+    Example:
+    
+    (start code js)
+     node.setData('width', 30);
+    (end code)
+    
+    If we were to make an animation of a node/edge width then we could do
+    
+    (start code js)
+      var node = viz.getNode('nodeId');
+      //set start and end values
+      node.setData('width', 10, 'start');
+      node.setData('width', 30, 'end');
+      //will animate nodes width property
+      viz.fx.animate({
+        modes: ['node-property:width'],
+        duration: 1000
+      });
+    (end code)
+    */
+    setData: function(prop, value, type) {
+      setDataInternal.call(this, "", prop, value, type);
+    },
+
+    /*
+    Method: setDataset
+
+    Convenience method to set multiple data values at once.
+    
+    Parameters:
+    
+    types - (array|string) A set of 'current', 'end' or 'start' values.
+    obj - (object) A hash containing the names and values of the properties to be altered.
+
+    Example:
+    (start code js)
+      node.setDataset(['current', 'end'], {
+        'width': [100, 5],
+        'color': ['#fff', '#ccc']
+      });
+      //...or also
+      node.setDataset('end', {
+        'width': 5,
+        'color': '#ccc'
+      });
+    (end code)
+    
+    See also: 
+    
+    <Accessors.setData>
+    
+    */
+    setDataset: function(types, obj) {
+      types = $.splat(types);
+      for(var attr in obj) {
+        for(var i=0, val = $.splat(obj[attr]), l=types.length; i<l; i++) {
+          this.setData(attr, val[i], types[i]);
+        }
+      }
+    },
+    
+    /*
+    Method: removeData
+
+    Remove data properties.
+
+    Parameters:
+
+    One or more property names as arguments. The dollar sign is not needed.
+
+    Example:
+    (start code js)
+    node.removeData('width'); //now the default width value is returned
+    (end code)
+    */
+    removeData: function() {
+      removeDataInternal.call(this, "", Array.prototype.slice.call(arguments));
+    },
+
+    /*
+    Method: getCanvasStyle
+
+    Returns the specified canvas style data value property. This is useful for
+    querying special/reserved <Graph.Node> canvas style data properties (i.e.
+    dollar prefixed properties that match with $canvas-<name of canvas style>).
+
+    Parameters:
+
+      prop  - (string) The name of the property. The dollar sign is not needed. For
+              example *getCanvasStyle(shadowBlur)* will return *data[$canvas-shadowBlur]*.
+      type  - (string) The type of the data property queried. Default's *current*. You can access *start* and *end* 
+              data properties also.
+              
+    Example:
+    (start code js)
+      node.getCanvasStyle('shadowBlur');
+    (end code)
+    
+    See also:
+    
+    <Accessors.getData>
+    */
+    getCanvasStyle: function(prop, type, force) {
+      return getDataInternal.call(
+          this, 'canvas', prop, type, force, this.Config.CanvasStyles);
+    },
+
+    /*
+    Method: setCanvasStyle
+
+    Sets the canvas style data property with some specific value.
+    This method is only useful for reserved (dollar prefixed) properties.
+    
+    Parameters:
+    
+    prop - (string) Name of the property. Can be any canvas property like 'shadowBlur', 'shadowColor', 'strokeStyle', etc.
+    value - (mixed) The value to set to the property.
+    type - (string) Default's *current*. Whether to set *start*, *current* or *end* type properties.
+    
+    Example:
+    
+    (start code js)
+     node.setCanvasStyle('shadowBlur', 30);
+    (end code)
+    
+    If we were to make an animation of a node/edge shadowBlur canvas style then we could do
+    
+    (start code js)
+      var node = viz.getNode('nodeId');
+      //set start and end values
+      node.setCanvasStyle('shadowBlur', 10, 'start');
+      node.setCanvasStyle('shadowBlur', 30, 'end');
+      //will animate nodes canvas style property for nodes
+      viz.fx.animate({
+        modes: ['node-style:shadowBlur'],
+        duration: 1000
+      });
+    (end code)
+    
+    See also:
+    
+    <Accessors.setData>.
+    */
+    setCanvasStyle: function(prop, value, type) {
+      setDataInternal.call(this, 'canvas', prop, value, type);
+    },
+
+    /*
+    Method: setCanvasStyles
+
+    Convenience method to set multiple styles at once.
+
+    Parameters:
+    
+    types - (array|string) A set of 'current', 'end' or 'start' values.
+    obj - (object) A hash containing the names and values of the properties to be altered.
+
+    See also:
+    
+    <Accessors.setDataset>.
+    */
+    setCanvasStyles: function(types, obj) {
+      types = $.splat(types);
+      for(var attr in obj) {
+        for(var i=0, val = $.splat(obj[attr]), l=types.length; i<l; i++) {
+          this.setCanvasStyle(attr, val[i], types[i]);
+        }
+      }
+    },
+
+    /*
+    Method: removeCanvasStyle
+
+    Remove canvas style properties from data.
+
+    Parameters:
+    
+    A variable number of canvas style strings.
+
+    See also:
+    
+    <Accessors.removeData>.
+    */
+    removeCanvasStyle: function() {
+      removeDataInternal.call(this, 'canvas', Array.prototype.slice.call(arguments));
+    },
+
+    /*
+    Method: getLabelData
+
+    Returns the specified label data value property. This is useful for
+    querying special/reserved <Graph.Node> label options (i.e.
+    dollar prefixed properties that match with $label-<name of label style>).
+
+    Parameters:
+
+      prop  - (string) The name of the property. The dollar sign prefix is not needed. For
+              example *getLabelData(size)* will return *data[$label-size]*.
+      type  - (string) The type of the data property queried. Default's *current*. You can access *start* and *end* 
+              data properties also.
+              
+    See also:
+    
+    <Accessors.getData>.
+    */
+    getLabelData: function(prop, type, force) {
+      return getDataInternal.call(
+          this, 'label', prop, type, force, this.Label);
+    },
+
+    /*
+    Method: setLabelData
+
+    Sets the current label data with some specific value.
+    This method is only useful for reserved (dollar prefixed) properties.
+
+    Parameters:
+    
+    prop - (string) Name of the property. Can be any canvas property like 'shadowBlur', 'shadowColor', 'strokeStyle', etc.
+    value - (mixed) The value to set to the property.
+    type - (string) Default's *current*. Whether to set *start*, *current* or *end* type properties.
+    
+    Example:
+    
+    (start code js)
+     node.setLabelData('size', 30);
+    (end code)
+    
+    If we were to make an animation of a node label size then we could do
+    
+    (start code js)
+      var node = viz.getNode('nodeId');
+      //set start and end values
+      node.setLabelData('size', 10, 'start');
+      node.setLabelData('size', 30, 'end');
+      //will animate nodes label size
+      viz.fx.animate({
+        modes: ['label-property:size'],
+        duration: 1000
+      });
+    (end code)
+    
+    See also:
+    
+    <Accessors.setData>.
+    */
+    setLabelData: function(prop, value, type) {
+      setDataInternal.call(this, 'label', prop, value, type);
+    },
+
+    /*
+    Method: setLabelDataset
+
+    Convenience function to set multiple label data at once.
+
+    Parameters:
+    
+    types - (array|string) A set of 'current', 'end' or 'start' values.
+    obj - (object) A hash containing the names and values of the properties to be altered.
+
+    See also:
+    
+    <Accessors.setDataset>.
+    */
+    setLabelDataset: function(types, obj) {
+      types = $.splat(types);
+      for(var attr in obj) {
+        for(var i=0, val = $.splat(obj[attr]), l=types.length; i<l; i++) {
+          this.setLabelData(attr, val[i], types[i]);
+        }
+      }
+    },
+
+    /*
+    Method: removeLabelData
+
+    Remove label properties from data.
+    
+    Parameters:
+    
+    A variable number of label property strings.
+
+    See also:
+    
+    <Accessors.removeData>.
+    */
+    removeLabelData: function() {
+      removeDataInternal.call(this, 'label', Array.prototype.slice.call(arguments));
+    }
+  };
+})();
+
+/*
+     Class: Graph.Node
+
+     A <Graph> node.
+     
+     Implements:
+     
+     <Accessors> methods.
+     
+     The following <Graph.Util> methods are implemented by <Graph.Node>
+     
+    - <Graph.Util.eachAdjacency>
+    - <Graph.Util.eachLevel>
+    - <Graph.Util.eachSubgraph>
+    - <Graph.Util.eachSubnode>
+    - <Graph.Util.anySubnode>
+    - <Graph.Util.getSubnodes>
+    - <Graph.Util.getParents>
+    - <Graph.Util.isDescendantOf>     
+*/
+Graph.Node = new Class({
+    
+  initialize: function(opt, complex, Node, Edge, Label) {
+    var innerOptions = {
+      'id': '',
+      'name': '',
+      'data': {},
+      'startData': {},
+      'endData': {},
+      'adjacencies': {},
+
+      'selected': false,
+      'drawn': false,
+      'exist': false,
+
+      'angleSpan': {
+        'begin': 0,
+        'end' : 0
+      },
+
+      'pos': (complex && $C(0, 0)) || $P(0, 0),
+      'startPos': (complex && $C(0, 0)) || $P(0, 0),
+      'endPos': (complex && $C(0, 0)) || $P(0, 0)
+    };
+    
+    $.extend(this, $.extend(innerOptions, opt));
+    this.Config = this.Node = Node;
+    this.Edge = Edge;
+    this.Label = Label;
+  },
+
+    /*
+       Method: adjacentTo
+    
+       Indicates if the node is adjacent to the node specified by id
+
+       Parameters:
+    
+          id - (string) A node id.
+    
+       Example:
+       (start code js)
+        node.adjacentTo('nodeId') == true;
+       (end code)
+    */
+    adjacentTo: function(node) {
+        return node.id in this.adjacencies;
+    },
+
+    /*
+       Method: getAdjacency
+    
+       Returns a <Graph.Adjacence> object connecting the current <Graph.Node> and the node having *id* as id.
+
+       Parameters:
+    
+          id - (string) A node id.
+    */  
+    getAdjacency: function(id) {
+        return this.adjacencies[id];
+    },
+
+    /*
+      Method: getPos
+   
+      Returns the position of the node.
+  
+      Parameters:
+   
+         type - (string) Default's *current*. Possible values are "start", "end" or "current".
+   
+      Returns:
+   
+        A <Complex> or <Polar> instance.
+  
+      Example:
+      (start code js)
+       var pos = node.getPos('end');
+      (end code)
+   */
+   getPos: function(type) {
+       type = type || "current";
+       if(type == "current") {
+         return this.pos;
+       } else if(type == "end") {
+         return this.endPos;
+       } else if(type == "start") {
+         return this.startPos;
+       }
+   },
+   /*
+     Method: setPos
+  
+     Sets the node's position.
+  
+     Parameters:
+  
+        value - (object) A <Complex> or <Polar> instance.
+        type - (string) Default's *current*. Possible values are "start", "end" or "current".
+  
+     Example:
+     (start code js)
+      node.setPos(new $jit.Complex(0, 0), 'end');
+     (end code)
+  */
+  setPos: function(value, type) {
+      type = type || "current";
+      var pos;
+      if(type == "current") {
+        pos = this.pos;
+      } else if(type == "end") {
+        pos = this.endPos;
+      } else if(type == "start") {
+        pos = this.startPos;
+      }
+      pos.set(value);
+  }
+});
+
+Graph.Node.implement(Accessors);
+
+/*
+     Class: Graph.Adjacence
+
+     A <Graph> adjacence (or edge) connecting two <Graph.Nodes>.
+     
+     Implements:
+     
+     <Accessors> methods.
+
+     See also:
+
+     <Graph>, <Graph.Node>
+
+     Properties:
+     
+      nodeFrom - A <Graph.Node> connected by this edge.
+      nodeTo - Another  <Graph.Node> connected by this edge.
+      data - Node data property containing a hash (i.e {}) with custom options.
+*/
+Graph.Adjacence = new Class({
+  
+  initialize: function(nodeFrom, nodeTo, data, Edge, Label) {
+    this.nodeFrom = nodeFrom;
+    this.nodeTo = nodeTo;
+    this.data = data || {};
+    this.startData = {};
+    this.endData = {};
+    this.Config = this.Edge = Edge;
+    this.Label = Label;
+  }
+});
+
+Graph.Adjacence.implement(Accessors);
+
+/*
+   Object: Graph.Util
+
+   <Graph> traversal and processing utility object.
+   
+   Note:
+   
+   For your convenience some of these methods have also been appended to <Graph> and <Graph.Node> classes.
+*/
+Graph.Util = {
+    /*
+       filter
+    
+       For internal use only. Provides a filtering function based on flags.
+    */
+    filter: function(param) {
+        if(!param || !($.type(param) == 'string')) return function() { return true; };
+        var props = param.split(" ");
+        return function(elem) {
+            for(var i=0; i<props.length; i++) { 
+              if(elem[props[i]]) { 
+                return false; 
+              }
+            }
+            return true;
+        };
+    },
+    /*
+       Method: getNode
+    
+       Returns a <Graph.Node> by *id*.
+       
+       Also implemented by:
+       
+       <Graph>
+
+       Parameters:
+
+       graph - (object) A <Graph> instance.
+       id - (string) A <Graph.Node> id.
+
+       Example:
+
+       (start code js)
+         $jit.Graph.Util.getNode(graph, 'nodeid');
+         //or...
+         graph.getNode('nodeid');
+       (end code)
+    */
+    getNode: function(graph, id) {
+        return graph.nodes[id];
+    },
+    
+    /*
+       Method: eachNode
+    
+       Iterates over <Graph> nodes performing an *action*.
+       
+       Also implemented by:
+       
+       <Graph>.
+
+       Parameters:
+
+       graph - (object) A <Graph> instance.
+       action - (function) A callback function having a <Graph.Node> as first formal parameter.
+
+       Example:
+       (start code js)
+         $jit.Graph.Util.eachNode(graph, function(node) {
+          alert(node.name);
+         });
+         //or...
+         graph.eachNode(function(node) {
+           alert(node.name);
+         });
+       (end code)
+    */
+    eachNode: function(graph, action, flags) {
+        var filter = this.filter(flags);
+        for(var i in graph.nodes) {
+          if(filter(graph.nodes[i])) action(graph.nodes[i]);
+        } 
+    },
+    
+    /*
+       Method: eachAdjacency
+    
+       Iterates over <Graph.Node> adjacencies applying the *action* function.
+       
+       Also implemented by:
+       
+       <Graph.Node>.
+
+       Parameters:
+
+       node - (object) A <Graph.Node>.
+       action - (function) A callback function having <Graph.Adjacence> as first formal parameter.
+
+       Example:
+       (start code js)
+         $jit.Graph.Util.eachAdjacency(node, function(adj) {
+          alert(adj.nodeTo.name);
+         });
+         //or...
+         node.eachAdjacency(function(adj) {
+           alert(adj.nodeTo.name);
+         });
+       (end code)
+    */
+    eachAdjacency: function(node, action, flags) {
+        var adj = node.adjacencies, filter = this.filter(flags);
+        for(var id in adj) {
+          var a = adj[id];
+          if(filter(a)) {
+            if(a.nodeFrom != node) {
+              var tmp = a.nodeFrom;
+              a.nodeFrom = a.nodeTo;
+              a.nodeTo = tmp;
+            }
+            action(a, id);
+          }
+        }
+    },
+
+     /*
+       Method: computeLevels
+    
+       Performs a BFS traversal setting the correct depth for each node.
+        
+       Also implemented by:
+       
+       <Graph>.
+       
+       Note:
+       
+       The depth of each node can then be accessed by 
+       >node._depth
+
+       Parameters:
+
+       graph - (object) A <Graph>.
+       id - (string) A starting node id for the BFS traversal.
+       startDepth - (optional|number) A minimum depth value. Default's 0.
+
+    */
+    computeLevels: function(graph, id, startDepth, flags) {
+        startDepth = startDepth || 0;
+        var filter = this.filter(flags);
+        this.eachNode(graph, function(elem) {
+            elem._flag = false;
+            elem._depth = -1;
+        }, flags);
+        var root = graph.getNode(id);
+        root._depth = startDepth;
+        var queue = [root];
+        while(queue.length != 0) {
+            var node = queue.pop();
+            node._flag = true;
+            this.eachAdjacency(node, function(adj) {
+                var n = adj.nodeTo;
+                if(n._flag == false && filter(n)) {
+                    if(n._depth < 0) n._depth = node._depth + 1 + startDepth;
+                    queue.unshift(n);
+                }
+            }, flags);
+        }
+    },
+
+    /*
+       Method: eachBFS
+    
+       Performs a BFS traversal applying *action* to each <Graph.Node>.
+       
+       Also implemented by:
+       
+       <Graph>.
+
+       Parameters:
+
+       graph - (object) A <Graph>.
+       id - (string) A starting node id for the BFS traversal.
+       action - (function) A callback function having a <Graph.Node> as first formal parameter.
+
+       Example:
+       (start code js)
+         $jit.Graph.Util.eachBFS(graph, 'mynodeid', function(node) {
+          alert(node.name);
+         });
+         //or...
+         graph.eachBFS('mynodeid', function(node) {
+           alert(node.name);
+         });
+       (end code)
+    */
+    eachBFS: function(graph, id, action, flags) {
+        var filter = this.filter(flags);
+        this.clean(graph);
+        var queue = [graph.getNode(id)];
+        while(queue.length != 0) {
+            var node = queue.pop();
+            node._flag = true;
+            action(node, node._depth);
+            this.eachAdjacency(node, function(adj) {
+                var n = adj.nodeTo;
+                if(n._flag == false && filter(n)) {
+                    n._flag = true;
+                    queue.unshift(n);
+                }
+            }, flags);
+        }
+    },
+    
+    /*
+       Method: eachLevel
+    
+       Iterates over a node's subgraph applying *action* to the nodes of relative depth between *levelBegin* and *levelEnd*.
+       
+       Also implemented by:
+       
+       <Graph.Node>.
+
+       Parameters:
+       
+       node - (object) A <Graph.Node>.
+       levelBegin - (number) A relative level value.
+       levelEnd - (number) A relative level value.
+       action - (function) A callback function having a <Graph.Node> as first formal parameter.
+
+    */
+    eachLevel: function(node, levelBegin, levelEnd, action, flags) {
+        var d = node._depth, filter = this.filter(flags), that = this;
+        levelEnd = levelEnd === false? Number.MAX_VALUE -d : levelEnd;
+        (function loopLevel(node, levelBegin, levelEnd) {
+            var d = node._depth;
+            if(d >= levelBegin && d <= levelEnd && filter(node)) action(node, d);
+            if(d < levelEnd) {
+                that.eachAdjacency(node, function(adj) {
+                    var n = adj.nodeTo;
+                    if(n._depth > d) loopLevel(n, levelBegin, levelEnd);
+                });
+            }
+        })(node, levelBegin + d, levelEnd + d);      
+    },
+
+    /*
+       Method: eachSubgraph
+    
+       Iterates over a node's children recursively.
+       
+       Also implemented by:
+       
+       <Graph.Node>.
+
+       Parameters:
+       node - (object) A <Graph.Node>.
+       action - (function) A callback function having a <Graph.Node> as first formal parameter.
+
+       Example:
+       (start code js)
+         $jit.Graph.Util.eachSubgraph(node, function(node) {
+           alert(node.name);
+         });
+         //or...
+         node.eachSubgraph(function(node) {
+           alert(node.name);
+         });
+       (end code)
+    */
+    eachSubgraph: function(node, action, flags) {
+      this.eachLevel(node, 0, false, action, flags);
+    },
+
+    /*
+       Method: eachSubnode
+    
+       Iterates over a node's children (without deeper recursion).
+       
+       Also implemented by:
+       
+       <Graph.Node>.
+       
+       Parameters:
+       node - (object) A <Graph.Node>.
+       action - (function) A callback function having a <Graph.Node> as first formal parameter.
+
+       Example:
+       (start code js)
+         $jit.Graph.Util.eachSubnode(node, function(node) {
+          alert(node.name);
+         });
+         //or...
+         node.eachSubnode(function(node) {
+           alert(node.name);
+         });
+       (end code)
+    */
+    eachSubnode: function(node, action, flags) {
+        this.eachLevel(node, 1, 1, action, flags);
+    },
+
+    /*
+       Method: anySubnode
+    
+       Returns *true* if any subnode matches the given condition.
+       
+       Also implemented by:
+       
+       <Graph.Node>.
+
+       Parameters:
+       node - (object) A <Graph.Node>.
+       cond - (function) A callback function returning a Boolean instance. This function has as first formal parameter a <Graph.Node>.
+
+       Example:
+       (start code js)
+         $jit.Graph.Util.anySubnode(node, function(node) { return node.name == "mynodename"; });
+         //or...
+         node.anySubnode(function(node) { return node.name == 'mynodename'; });
+       (end code)
+    */
+    anySubnode: function(node, cond, flags) {
+      var flag = false;
+      cond = cond || $.lambda(true);
+      var c = $.type(cond) == 'string'? function(n) { return n[cond]; } : cond;
+      this.eachSubnode(node, function(elem) {
+        if(c(elem)) flag = true;
+      }, flags);
+      return flag;
+    },
+  
+    /*
+       Method: getSubnodes
+    
+       Collects all subnodes for a specified node. 
+       The *level* parameter filters nodes having relative depth of *level* from the root node. 
+       
+       Also implemented by:
+       
+       <Graph.Node>.
+
+       Parameters:
+       node - (object) A <Graph.Node>.
+       level - (optional|number) Default's *0*. A starting relative depth for collecting nodes.
+
+       Returns:
+       An array of nodes.
+
+    */
+    getSubnodes: function(node, level, flags) {
+        var ans = [], that = this;
+        level = level || 0;
+        var levelStart, levelEnd;
+        if($.type(level) == 'array') {
+            levelStart = level[0];
+            levelEnd = level[1];
+        } else {
+            levelStart = level;
+            levelEnd = Number.MAX_VALUE - node._depth;
+        }
+        this.eachLevel(node, levelStart, levelEnd, function(n) {
+            ans.push(n);
+        }, flags);
+        return ans;
+    },
+  
+  
+    /*
+       Method: getParents
+    
+       Returns an Array of <Graph.Nodes> which are parents of the given node.
+       
+       Also implemented by:
+       
+       <Graph.Node>.
+
+       Parameters:
+       node - (object) A <Graph.Node>.
+
+       Returns:
+       An Array of <Graph.Nodes>.
+
+       Example:
+       (start code js)
+         var pars = $jit.Graph.Util.getParents(node);
+         //or...
+         var pars = node.getParents();
+         
+         if(pars.length > 0) {
+           //do stuff with parents
+         }
+       (end code)
+    */
+    getParents: function(node) {
+        var ans = [];
+        this.eachAdjacency(node, function(adj) {
+            var n = adj.nodeTo;
+            if(n._depth < node._depth) ans.push(n);
+        });
+        return ans;
+    },
+    
+    /*
+    Method: isDescendantOf
+ 
+    Returns a boolean indicating if some node is descendant of the node with the given id. 
+
+    Also implemented by:
+    
+    <Graph.Node>.
+    
+    
+    Parameters:
+    node - (object) A <Graph.Node>.
+    id - (string) A <Graph.Node> id.
+
+    Example:
+    (start code js)
+      $jit.Graph.Util.isDescendantOf(node, "nodeid"); //true|false
+      //or...
+      node.isDescendantOf('nodeid');//true|false
+    (end code)
+ */
+ isDescendantOf: function(node, id) {
+    if(node.id == id) return true;
+    var pars = this.getParents(node), ans = false;
+    for ( var i = 0; !ans && i < pars.length; i++) {
+    ans = ans || this.isDescendantOf(pars[i], id);
+  }
+    return ans;
+ },
+
+ /*
+     Method: clean
+  
+     Cleans flags from nodes.
+
+     Also implemented by:
+     
+     <Graph>.
+     
+     Parameters:
+     graph - A <Graph> instance.
+  */
+  clean: function(graph) { this.eachNode(graph, function(elem) { elem._flag = false; }); },
+  
+  /* 
+    Method: getClosestNodeToOrigin 
+  
+    Returns the closest node to the center of canvas.
+  
+    Also implemented by:
+    
+    <Graph>.
+    
+    Parameters:
+   
+     graph - (object) A <Graph> instance.
+     prop - (optional|string) Default's 'current'. A <Graph.Node> position property. Possible properties are 'start', 'current' or 'end'.
+  
+  */
+  getClosestNodeToOrigin: function(graph, prop, flags) {
+   return this.getClosestNodeToPos(graph, Polar.KER, prop, flags);
+  },
+  
+  /* 
+    Method: getClosestNodeToPos
+  
+    Returns the closest node to the given position.
+  
+    Also implemented by:
+    
+    <Graph>.
+    
+    Parameters:
+   
+     graph - (object) A <Graph> instance.
+     pos - (object) A <Complex> or <Polar> instance.
+     prop - (optional|string) Default's *current*. A <Graph.Node> position property. Possible properties are 'start', 'current' or 'end'.
+  
+  */
+  getClosestNodeToPos: function(graph, pos, prop, flags) {
+   var node = null;
+   prop = prop || 'current';
+   pos = pos && pos.getc(true) || Complex.KER;
+   var distance = function(a, b) {
+     var d1 = a.x - b.x, d2 = a.y - b.y;
+     return d1 * d1 + d2 * d2;
+   };
+   this.eachNode(graph, function(elem) {
+     node = (node == null || distance(elem.getPos(prop).getc(true), pos) < distance(
+         node.getPos(prop).getc(true), pos)) ? elem : node;
+   }, flags);
+   return node;
+  } 
+};
+
+//Append graph methods to <Graph>
+$.each(['getNode', 'eachNode', 'computeLevels', 'eachBFS', 'clean', 'getClosestNodeToPos', 'getClosestNodeToOrigin'], function(m) {
+  Graph.prototype[m] = function() {
+    return Graph.Util[m].apply(Graph.Util, [this].concat(Array.prototype.slice.call(arguments)));
+  };
+});
+
+//Append node methods to <Graph.Node>
+$.each(['eachAdjacency', 'eachLevel', 'eachSubgraph', 'eachSubnode', 'anySubnode', 'getSubnodes', 'getParents', 'isDescendantOf'], function(m) {
+  Graph.Node.prototype[m] = function() {
+    return Graph.Util[m].apply(Graph.Util, [this].concat(Array.prototype.slice.call(arguments)));
+  };
+});
+
+/*
+ * File: Graph.Op.js
+ *
+*/
+
+/*
+   Object: Graph.Op
+
+   Perform <Graph> operations like adding/removing <Graph.Nodes> or <Graph.Adjacences>, 
+   morphing a <Graph> into another <Graph>, contracting or expanding subtrees, etc.
+
+*/
+Graph.Op = {
+
+    options: {
+      type: 'nothing',
+      duration: 2000,
+      hideLabels: true,
+      fps:30
+    },
+    
+    initialize: function(viz) {
+      this.viz = viz;
+    },
+
+    /*
+       Method: removeNode
+    
+       Removes one or more <Graph.Nodes> from the visualization. 
+       It can also perform several animations like fading sequentially, fading concurrently, iterating or replotting.
+
+       Parameters:
+    
+        node - (string|array) The node's id. Can also be an array having many ids.
+        opt - (object) Animation options. It's an object with optional properties described below
+        type - (string) Default's *nothing*. Type of the animation. Can be "nothing", "replot", "fade:seq",  "fade:con" or "iter".
+        duration - Described in <Options.Fx>.
+        fps - Described in <Options.Fx>.
+        transition - Described in <Options.Fx>.
+        hideLabels - (boolean) Default's *true*. Hide labels during the animation.
+   
+      Example:
+      (start code js)
+        var viz = new $jit.Viz(options);
+        viz.op.removeNode('nodeId', {
+          type: 'fade:seq',
+          duration: 1000,
+          hideLabels: false,
+          transition: $jit.Trans.Quart.easeOut
+        });
+        //or also
+        viz.op.removeNode(['someId', 'otherId'], {
+          type: 'fade:con',
+          duration: 1500
+        });
+      (end code)
+    */
+  
+    removeNode: function(node, opt) {
+        var viz = this.viz;
+        var options = $.merge(this.options, viz.controller, opt);
+        var n = $.splat(node);
+        var i, that, nodeObj;
+        switch(options.type) {
+            case 'nothing':
+                for(i=0; i<n.length; i++) viz.graph.removeNode(n[i]);
+                break;
+            
+            case 'replot':
+                this.removeNode(n, { type: 'nothing' });
+                viz.labels.clearLabels();
+                viz.refresh(true);
+                break;
+            
+            case 'fade:seq': case 'fade':
+                that = this;
+                //set alpha to 0 for nodes to remove.
+                for(i=0; i<n.length; i++) {
+                    nodeObj = viz.graph.getNode(n[i]);
+                    nodeObj.setData('alpha', 0, 'end');
+                }
+                viz.fx.animate($.merge(options, {
+                    modes: ['node-property:alpha'],
+                    onComplete: function() {
+                        that.removeNode(n, { type: 'nothing' });
+                        viz.labels.clearLabels();
+                        viz.reposition();
+                        viz.fx.animate($.merge(options, {
+                            modes: ['linear']
+                        }));
+                    }
+                }));
+                break;
+            
+            case 'fade:con':
+                that = this;
+                //set alpha to 0 for nodes to remove. Tag them for being ignored on computing positions.
+                for(i=0; i<n.length; i++) {
+                    nodeObj = viz.graph.getNode(n[i]);
+                    nodeObj.setData('alpha', 0, 'end');
+                    nodeObj.ignore = true;
+                }
+                viz.reposition();
+                viz.fx.animate($.merge(options, {
+                    modes: ['node-property:alpha', 'linear'],
+                    onComplete: function() {
+                        that.removeNode(n, { type: 'nothing' });
+                    }
+                }));
+                break;
+            
+            case 'iter':
+                that = this;
+                viz.fx.sequence({
+                    condition: function() { return n.length != 0; },
+                    step: function() { that.removeNode(n.shift(), { type: 'nothing' });  viz.labels.clearLabels(); },
+                    onComplete: function() { options.onComplete(); },
+                    duration: Math.ceil(options.duration / n.length)
+                });
+                break;
+                
+            default: this.doError();
+        }
+    },
+    
+    /*
+       Method: removeEdge
+    
+       Removes one or more <Graph.Adjacences> from the visualization. 
+       It can also perform several animations like fading sequentially, fading concurrently, iterating or replotting.
+
+       Parameters:
+    
+       vertex - (array) An array having two strings which are the ids of the nodes connected by this edge (i.e ['id1', 'id2']). Can also be a two dimensional array holding many edges (i.e [['id1', 'id2'], ['id3', 'id4'], ...]).
+       opt - (object) Animation options. It's an object with optional properties described below
+       type - (string) Default's *nothing*. Type of the animation. Can be "nothing", "replot", "fade:seq",  "fade:con" or "iter".
+       duration - Described in <Options.Fx>.
+       fps - Described in <Options.Fx>.
+       transition - Described in <Options.Fx>.
+       hideLabels - (boolean) Default's *true*. Hide labels during the animation.
+   
+      Example:
+      (start code js)
+        var viz = new $jit.Viz(options);
+        viz.op.removeEdge(['nodeId', 'otherId'], {
+          type: 'fade:seq',
+          duration: 1000,
+          hideLabels: false,
+          transition: $jit.Trans.Quart.easeOut
+        });
+        //or also
+        viz.op.removeEdge([['someId', 'otherId'], ['id3', 'id4']], {
+          type: 'fade:con',
+          duration: 1500
+        });
+      (end code)
+    
+    */
+    removeEdge: function(vertex, opt) {
+        var viz = this.viz;
+        var options = $.merge(this.options, viz.controller, opt);
+        var v = ($.type(vertex[0]) == 'string')? [vertex] : vertex;
+        var i, that, adj;
+        switch(options.type) {
+            case 'nothing':
+                for(i=0; i<v.length; i++)   viz.graph.removeAdjacence(v[i][0], v[i][1]);
+                break;
+            
+            case 'replot':
+                this.removeEdge(v, { type: 'nothing' });
+                viz.refresh(true);
+                break;
+            
+            case 'fade:seq': case 'fade':
+                that = this;
+                //set alpha to 0 for edges to remove.
+                for(i=0; i<v.length; i++) {
+                    adj = viz.graph.getAdjacence(v[i][0], v[i][1]);
+                    if(adj) {
+                        adj.setData('alpha', 0,'end');
+                    }
+                }
+                viz.fx.animate($.merge(options, {
+                    modes: ['edge-property:alpha'],
+                    onComplete: function() {
+                        that.removeEdge(v, { type: 'nothing' });
+                        viz.reposition();
+                        viz.fx.animate($.merge(options, {
+                            modes: ['linear']
+                        }));
+                    }
+                }));
+                break;
+            
+            case 'fade:con':
+                that = this;
+                //set alpha to 0 for nodes to remove. Tag them for being ignored when computing positions.
+                for(i=0; i<v.length; i++) {
+                    adj = viz.graph.getAdjacence(v[i][0], v[i][1]);
+                    if(adj) {
+                        adj.setData('alpha',0 ,'end');
+                        adj.ignore = true;
+                    }
+                }
+                viz.reposition();
+                viz.fx.animate($.merge(options, {
+                    modes: ['edge-property:alpha', 'linear'],
+                    onComplete: function() {
+                        that.removeEdge(v, { type: 'nothing' });
+                    }
+                }));
+                break;
+            
+            case 'iter':
+                that = this;
+                viz.fx.sequence({
+                    condition: function() { return v.length != 0; },
+                    step: function() { that.removeEdge(v.shift(), { type: 'nothing' }); viz.labels.clearLabels(); },
+                    onComplete: function() { options.onComplete(); },
+                    duration: Math.ceil(options.duration / v.length)
+                });
+                break;
+                
+            default: this.doError();
+        }
+    },
+    
+    /*
+       Method: sum
+    
+       Adds a new graph to the visualization. 
+       The JSON graph (or tree) must at least have a common node with the current graph plotted by the visualization. 
+       The resulting graph can be defined as follows <http://mathworld.wolfram.com/GraphSum.html>
+
+       Parameters:
+    
+       json - (object) A json tree or graph structure. See also <Loader.loadJSON>.
+       opt - (object) Animation options. It's an object with optional properties described below
+       type - (string) Default's *nothing*. Type of the animation. Can be "nothing", "replot", "fade:seq",  "fade:con".
+       duration - Described in <Options.Fx>.
+       fps - Described in <Options.Fx>.
+       transition - Described in <Options.Fx>.
+       hideLabels - (boolean) Default's *true*. Hide labels during the animation.
+   
+      Example:
+      (start code js)
+        //...json contains a tree or graph structure...
+
+        var viz = new $jit.Viz(options);
+        viz.op.sum(json, {
+          type: 'fade:seq',
+          duration: 1000,
+          hideLabels: false,
+          transition: $jit.Trans.Quart.easeOut
+        });
+        //or also
+        viz.op.sum(json, {
+          type: 'fade:con',
+          duration: 1500
+        });
+      (end code)
+    
+    */
+    sum: function(json, opt) {
+        var viz = this.viz;
+        var options = $.merge(this.options, viz.controller, opt), root = viz.root;
+        var graph;
+        viz.root = opt.id || viz.root;
+        switch(options.type) {
+            case 'nothing':
+                graph = viz.construct(json);
+                graph.eachNode(function(elem) {
+                    elem.eachAdjacency(function(adj) {
+                        viz.graph.addAdjacence(adj.nodeFrom, adj.nodeTo, adj.data);
+                    });
+                });
+                break;
+            
+            case 'replot':
+                viz.refresh(true);
+                this.sum(json, { type: 'nothing' });
+                viz.refresh(true);
+                break;
+            
+            case 'fade:seq': case 'fade': case 'fade:con':
+                that = this;
+                graph = viz.construct(json);
+
+                //set alpha to 0 for nodes to add.
+                var fadeEdges = this.preprocessSum(graph);
+                var modes = !fadeEdges? ['node-property:alpha'] : ['node-property:alpha', 'edge-property:alpha'];
+                viz.reposition();
+                if(options.type != 'fade:con') {
+                    viz.fx.animate($.merge(options, {
+                        modes: ['linear'],
+                        onComplete: function() {
+                            viz.fx.animate($.merge(options, {
+                                modes: modes,
+                                onComplete: function() {
+                                    options.onComplete();
+                                }
+                            }));
+                        }
+                    }));
+                } else {
+                    viz.graph.eachNode(function(elem) {
+                        if (elem.id != root && elem.pos.getp().equals(Polar.KER)) {
+                          elem.pos.set(elem.endPos); elem.startPos.set(elem.endPos);
+                        }
+                    });
+                    viz.fx.animate($.merge(options, {
+                        modes: ['linear'].concat(modes)
+                    }));
+                }
+                break;
+
+            default: this.doError();
+        }
+    },
+    
+    /*
+       Method: morph
+    
+       This method will transform the current visualized graph into the new JSON representation passed in the method. 
+       The JSON object must at least have the root node in common with the current visualized graph.
+
+       Parameters:
+    
+       json - (object) A json tree or graph structure. See also <Loader.loadJSON>.
+       opt - (object) Animation options. It's an object with optional properties described below
+       type - (string) Default's *nothing*. Type of the animation. Can be "nothing", "replot", "fade:con".
+       duration - Described in <Options.Fx>.
+       fps - Described in <Options.Fx>.
+       transition - Described in <Options.Fx>.
+       hideLabels - (boolean) Default's *true*. Hide labels during the animation.
+       id - (string) The shared <Graph.Node> id between both graphs.
+       
+       extraModes - (optional|object) When morphing with an animation, dollar prefixed data parameters are added to 
+                    *endData* and not *data* itself. This way you can animate dollar prefixed parameters during your morphing operation. 
+                    For animating these extra-parameters you have to specify an object that has animation groups as keys and animation 
+                    properties as values, just like specified in <Graph.Plot.animate>.
+   
+      Example:
+      (start code js)
+        //...json contains a tree or graph structure...
+
+        var viz = new $jit.Viz(options);
+        viz.op.morph(json, {
+          type: 'fade',
+          duration: 1000,
+          hideLabels: false,
+          transition: $jit.Trans.Quart.easeOut
+        });
+        //or also
+        viz.op.morph(json, {
+          type: 'fade',
+          duration: 1500
+        });
+        //if the json data contains dollar prefixed params
+        //like $width or $height these too can be animated
+        viz.op.morph(json, {
+          type: 'fade',
+          duration: 1500
+        }, {
+          'node-property': ['width', 'height']
+        });
+      (end code)
+    
+    */
+    morph: function(json, opt, extraModes) {
+        var viz = this.viz;
+        var options = $.merge(this.options, viz.controller, opt), root = viz.root;
+        var graph;
+        //TODO(nico) this hack makes morphing work with the Hypertree. 
+        //Need to check if it has been solved and this can be removed.
+        viz.root = opt.id || viz.root;
+        switch(options.type) {
+            case 'nothing':
+                graph = viz.construct(json);
+                graph.eachNode(function(elem) {
+                  var nodeExists = viz.graph.hasNode(elem.id);  
+                  elem.eachAdjacency(function(adj) {
+                    var adjExists = !!viz.graph.getAdjacence(adj.nodeFrom.id, adj.nodeTo.id);
+                    viz.graph.addAdjacence(adj.nodeFrom, adj.nodeTo, adj.data);
+                    //Update data properties if the node existed
+                    if(adjExists) {
+                      var addedAdj = viz.graph.getAdjacence(adj.nodeFrom.id, adj.nodeTo.id);
+                      for(var prop in (adj.data || {})) {
+                        addedAdj.data[prop] = adj.data[prop];
+                      }
+                    }
+                  });
+                  //Update data properties if the node existed
+                  if(nodeExists) {
+                    var addedNode = viz.graph.getNode(elem.id);
+                    for(var prop in (elem.data || {})) {
+                      addedNode.data[prop] = elem.data[prop];
+                    }
+                  }
+                });
+                viz.graph.eachNode(function(elem) {
+                    elem.eachAdjacency(function(adj) {
+                        if(!graph.getAdjacence(adj.nodeFrom.id, adj.nodeTo.id)) {
+                            viz.graph.removeAdjacence(adj.nodeFrom.id, adj.nodeTo.id);
+                        }
+                    });
+                    if(!graph.hasNode(elem.id)) viz.graph.removeNode(elem.id);
+                });
+                
+                break;
+            
+            case 'replot':
+                viz.labels.clearLabels(true);
+                this.morph(json, { type: 'nothing' });
+                viz.refresh(true);
+                viz.refresh(true);
+                break;
+                
+            case 'fade:seq': case 'fade': case 'fade:con':
+                that = this;
+                graph = viz.construct(json);
+                //preprocessing for nodes to delete.
+                //get node property modes to interpolate
+                var nodeModes = extraModes && ('node-property' in extraModes) 
+                  && $.map($.splat(extraModes['node-property']), 
+                      function(n) { return '$' + n; });
+                viz.graph.eachNode(function(elem) {
+                  var graphNode = graph.getNode(elem.id);   
+                  if(!graphNode) {
+                      elem.setData('alpha', 1);
+                      elem.setData('alpha', 1, 'start');
+                      elem.setData('alpha', 0, 'end');
+                      elem.ignore = true;
+                    } else {
+                      //Update node data information
+                      var graphNodeData = graphNode.data;
+                      for(var prop in graphNodeData) {
+                        if(nodeModes && ($.indexOf(nodeModes, prop) > -1)) {
+                          elem.endData[prop] = graphNodeData[prop];
+                        } else {
+                          elem.data[prop] = graphNodeData[prop];
+                        }
+                      }
+                    }
+                }); 
+                viz.graph.eachNode(function(elem) {
+                    if(elem.ignore) return;
+                    elem.eachAdjacency(function(adj) {
+                        if(adj.nodeFrom.ignore || adj.nodeTo.ignore) return;
+                        var nodeFrom = graph.getNode(adj.nodeFrom.id);
+                        var nodeTo = graph.getNode(adj.nodeTo.id);
+                        if(!nodeFrom.adjacentTo(nodeTo)) {
+                            var adj = viz.graph.getAdjacence(nodeFrom.id, nodeTo.id);
+                            fadeEdges = true;
+                            adj.setData('alpha', 1);
+                            adj.setData('alpha', 1, 'start');
+                            adj.setData('alpha', 0, 'end');
+                        }
+                    });
+                }); 
+                //preprocessing for adding nodes.
+                var fadeEdges = this.preprocessSum(graph);
+
+                var modes = !fadeEdges? ['node-property:alpha'] : 
+                                        ['node-property:alpha', 
+                                         'edge-property:alpha'];
+                //Append extra node-property animations (if any)
+                modes[0] = modes[0] + ((extraModes && ('node-property' in extraModes))? 
+                    (':' + $.splat(extraModes['node-property']).join(':')) : '');
+                //Append extra edge-property animations (if any)
+                modes[1] = (modes[1] || 'edge-property:alpha') + ((extraModes && ('edge-property' in extraModes))? 
+                    (':' + $.splat(extraModes['edge-property']).join(':')) : '');
+                //Add label-property animations (if any)
+                if(extraModes && ('label-property' in extraModes)) {
+                  modes.push('label-property:' + $.splat(extraModes['label-property']).join(':'))
+                }
+                viz.reposition();
+                viz.graph.eachNode(function(elem) {
+                    if (elem.id != root && elem.pos.getp().equals(Polar.KER)) {
+                      elem.pos.set(elem.endPos); elem.startPos.set(elem.endPos);
+                    }
+                });
+                viz.fx.animate($.merge(options, {
+                    modes: ['polar'].concat(modes),
+                    onComplete: function() {
+                        viz.graph.eachNode(function(elem) {
+                            if(elem.ignore) viz.graph.removeNode(elem.id);
+                        });
+                        viz.graph.eachNode(function(elem) {
+                            elem.eachAdjacency(function(adj) {
+                                if(adj.ignore) viz.graph.removeAdjacence(adj.nodeFrom.id, adj.nodeTo.id);
+                            });
+                        });
+                        options.onComplete();
+                    }
+                }));
+                break;
+
+            default:;
+        }
+    },
+
+    
+  /*
+    Method: contract
+ 
+    Collapses the subtree of the given node. The node will have a _collapsed=true_ property.
+    
+    Parameters:
+ 
+    node - (object) A <Graph.Node>.
+    opt - (object) An object containing options described below
+    type - (string) Whether to 'replot' or 'animate' the contraction.
+   
+    There are also a number of Animation options. For more information see <Options.Fx>.
+
+    Example:
+    (start code js)
+     var viz = new $jit.Viz(options);
+     viz.op.contract(node, {
+       type: 'animate',
+       duration: 1000,
+       hideLabels: true,
+       transition: $jit.Trans.Quart.easeOut
+     });
+   (end code)
+ 
+   */
+    contract: function(node, opt) {
+      var viz = this.viz;
+      if(node.collapsed || !node.anySubnode($.lambda(true))) return;
+      opt = $.merge(this.options, viz.config, opt || {}, {
+        'modes': ['node-property:alpha:span', 'linear']
+      });
+      node.collapsed = true;
+      (function subn(n) {
+        n.eachSubnode(function(ch) {
+          ch.ignore = true;
+          ch.setData('alpha', 0, opt.type == 'animate'? 'end' : 'current');
+          subn(ch);
+        });
+      })(node);
+      if(opt.type == 'animate') {
+        viz.compute('end');
+        if(viz.rotated) {
+          viz.rotate(viz.rotated, 'none', {
+            'property':'end'
+          });
+        }
+        (function subn(n) {
+          n.eachSubnode(function(ch) {
+            ch.setPos(node.getPos('end'), 'end');
+            subn(ch);
+          });
+        })(node);
+        viz.fx.animate(opt);
+      } else if(opt.type == 'replot'){
+        viz.refresh();
+      }
+    },
+    
+    /*
+    Method: expand
+ 
+    Expands the previously contracted subtree. The given node must have the _collapsed=true_ property.
+    
+    Parameters:
+ 
+    node - (object) A <Graph.Node>.
+    opt - (object) An object containing options described below
+    type - (string) Whether to 'replot' or 'animate'.
+     
+    There are also a number of Animation options. For more information see <Options.Fx>.
+
+    Example:
+    (start code js)
+      var viz = new $jit.Viz(options);
+      viz.op.expand(node, {
+        type: 'animate',
+        duration: 1000,
+        hideLabels: true,
+        transition: $jit.Trans.Quart.easeOut
+      });
+    (end code)
+ 
+   */
+    expand: function(node, opt) {
+      if(!('collapsed' in node)) return;
+      var viz = this.viz;
+      opt = $.merge(this.options, viz.config, opt || {}, {
+        'modes': ['node-property:alpha:span', 'linear']
+      });
+      delete node.collapsed;
+      (function subn(n) {
+        n.eachSubnode(function(ch) {
+          delete ch.ignore;
+          ch.setData('alpha', 1, opt.type == 'animate'? 'end' : 'current');
+          subn(ch);
+        });
+      })(node);
+      if(opt.type == 'animate') {
+        viz.compute('end');
+        if(viz.rotated) {
+          viz.rotate(viz.rotated, 'none', {
+            'property':'end'
+          });
+        }
+        viz.fx.animate(opt);
+      } else if(opt.type == 'replot'){
+        viz.refresh();
+      }
+    },
+
+    preprocessSum: function(graph) {
+        var viz = this.viz;
+        graph.eachNode(function(elem) {
+            if(!viz.graph.hasNode(elem.id)) {
+                viz.graph.addNode(elem);
+                var n = viz.graph.getNode(elem.id);
+                n.setData('alpha', 0);
+                n.setData('alpha', 0, 'start');
+                n.setData('alpha', 1, 'end');
+            }
+        }); 
+        var fadeEdges = false;
+        graph.eachNode(function(elem) {
+            elem.eachAdjacency(function(adj) {
+                var nodeFrom = viz.graph.getNode(adj.nodeFrom.id);
+                var nodeTo = viz.graph.getNode(adj.nodeTo.id);
+                if(!nodeFrom.adjacentTo(nodeTo)) {
+                    var adj = viz.graph.addAdjacence(nodeFrom, nodeTo, adj.data);
+                    if(nodeFrom.startAlpha == nodeFrom.endAlpha 
+                    && nodeTo.startAlpha == nodeTo.endAlpha) {
+                        fadeEdges = true;
+                        adj.setData('alpha', 0);
+                        adj.setData('alpha', 0, 'start');
+                        adj.setData('alpha', 1, 'end');
+                    } 
+                }
+            });
+        }); 
+        return fadeEdges;
+    }
+};
+
+
+
+/*
+   File: Helpers.js
+ 
+   Helpers are objects that contain rendering primitives (like rectangles, ellipses, etc), for plotting nodes and edges.
+   Helpers also contain implementations of the *contains* method, a method returning a boolean indicating whether the mouse
+   position is over the rendered shape.
+   
+   Helpers are very useful when implementing new NodeTypes, since you can access them through *this.nodeHelper* and 
+   *this.edgeHelper* <Graph.Plot> properties, providing you with simple primitives and mouse-position check functions.
+   
+   Example:
+   (start code js)
+   //implement a new node type
+   $jit.Viz.Plot.NodeTypes.implement({
+     'customNodeType': {
+       'render': function(node, canvas) {
+         this.nodeHelper.circle.render ...
+       },
+       'contains': function(node, pos) {
+         this.nodeHelper.circle.contains ...
+       }
+     }
+   });
+   //implement an edge type
+   $jit.Viz.Plot.EdgeTypes.implement({
+     'customNodeType': {
+       'render': function(node, canvas) {
+         this.edgeHelper.circle.render ...
+       },
+       //optional
+       'contains': function(node, pos) {
+         this.edgeHelper.circle.contains ...
+       }
+     }
+   });
+   (end code)
+
+*/
+
+/*
+   Object: NodeHelper
+   
+   Contains rendering and other type of primitives for simple shapes.
+ */
+var NodeHelper = {
+  'none': {
+    'render': $.empty,
+    'contains': $.lambda(false)
+  },
+  /*
+   Object: NodeHelper.circle
+   */
+  'circle': {
+    /*
+     Method: render
+     
+     Renders a circle into the canvas.
+     
+     Parameters:
+     
+     type - (string) Possible options are 'fill' or 'stroke'.
+     pos - (object) An *x*, *y* object with the position of the center of the circle.
+     radius - (number) The radius of the circle to be rendered.
+     canvas - (object) A <Canvas> instance.
+     
+     Example:
+     (start code js)
+     NodeHelper.circle.render('fill', { x: 10, y: 30 }, 30, viz.canvas);
+     (end code)
+     */
+    'render': function(type, pos, radius, canvas){
+      var ctx = canvas.getCtx();
+      ctx.beginPath();
+      ctx.arc(pos.x, pos.y, radius, 0, Math.PI * 2, true);
+      ctx.closePath();
+      ctx[type]();
+    },
+    /*
+    Method: contains
+    
+    Returns *true* if *pos* is contained in the area of the shape. Returns *false* otherwise.
+    
+    Parameters:
+    
+    npos - (object) An *x*, *y* object with the <Graph.Node> position.
+    pos - (object) An *x*, *y* object with the position to check.
+    radius - (number) The radius of the rendered circle.
+    
+    Example:
+    (start code js)
+    NodeHelper.circle.contains({ x: 10, y: 30 }, { x: 15, y: 35 }, 30); //true
+    (end code)
+    */
+    'contains': function(npos, pos, radius){
+      var diffx = npos.x - pos.x, 
+          diffy = npos.y - pos.y, 
+          diff = diffx * diffx + diffy * diffy;
+      return diff <= radius * radius;
+    }
+  },
+  /*
+  Object: NodeHelper.ellipse
+  */
+  'ellipse': {
+    /*
+    Method: render
+    
+    Renders an ellipse into the canvas.
+    
+    Parameters:
+    
+    type - (string) Possible options are 'fill' or 'stroke'.
+    pos - (object) An *x*, *y* object with the position of the center of the ellipse.
+    width - (number) The width of the ellipse.
+    height - (number) The height of the ellipse.
+    canvas - (object) A <Canvas> instance.
+    
+    Example:
+    (start code js)
+    NodeHelper.ellipse.render('fill', { x: 10, y: 30 }, 30, 40, viz.canvas);
+    (end code)
+    */
+    'render': function(type, pos, width, height, canvas){
+      var ctx = canvas.getCtx();
+      height /= 2;
+      width /= 2;
+      ctx.save();
+      ctx.scale(width / height, height / width);
+      ctx.beginPath();
+      ctx.arc(pos.x * (height / width), pos.y * (width / height), height, 0,
+          Math.PI * 2, true);
+      ctx.closePath();
+      ctx[type]();
+      ctx.restore();
+    },
+    /*
+    Method: contains
+    
+    Returns *true* if *pos* is contained in the area of the shape. Returns *false* otherwise.
+    
+    Parameters:
+    
+    npos - (object) An *x*, *y* object with the <Graph.Node> position.
+    pos - (object) An *x*, *y* object with the position to check.
+    width - (number) The width of the rendered ellipse.
+    height - (number) The height of the rendered ellipse.
+    
+    Example:
+    (start code js)
+    NodeHelper.ellipse.contains({ x: 10, y: 30 }, { x: 15, y: 35 }, 30, 40);
+    (end code)
+    */
+    'contains': function(npos, pos, width, height){
+      // TODO(nico): be more precise...
+      width /= 2; 
+      height /= 2;
+      var dist = (width + height) / 2, 
+          diffx = npos.x - pos.x, 
+          diffy = npos.y - pos.y, 
+          diff = diffx * diffx + diffy * diffy;
+      return diff <= dist * dist;
+    }
+  },
+  /*
+  Object: NodeHelper.square
+  */
+  'square': {
+    /*
+    Method: render
+    
+    Renders a square into the canvas.
+    
+    Parameters:
+    
+    type - (string) Possible options are 'fill' or 'stroke'.
+    pos - (object) An *x*, *y* object with the position of the center of the square.
+    dim - (number) The radius (or half-diameter) of the square.
+    canvas - (object) A <Canvas> instance.
+    
+    Example:
+    (start code js)
+    NodeHelper.square.render('stroke', { x: 10, y: 30 }, 40, viz.canvas);
+    (end code)
+    */
+    'render': function(type, pos, dim, canvas){
+      canvas.getCtx()[type + "Rect"](pos.x - dim, pos.y - dim, 2*dim, 2*dim);
+    },
+    /*
+    Method: contains
+    
+    Returns *true* if *pos* is contained in the area of the shape. Returns *false* otherwise.
+    
+    Parameters:
+    
+    npos - (object) An *x*, *y* object with the <Graph.Node> position.
+    pos - (object) An *x*, *y* object with the position to check.
+    dim - (number) The radius (or half-diameter) of the square.
+    
+    Example:
+    (start code js)
+    NodeHelper.square.contains({ x: 10, y: 30 }, { x: 15, y: 35 }, 30);
+    (end code)
+    */
+    'contains': function(npos, pos, dim){
+      return Math.abs(pos.x - npos.x) <= dim && Math.abs(pos.y - npos.y) <= dim;
+    }
+  },
+  /*
+  Object: NodeHelper.rectangle
+  */
+  'rectangle': {
+    /*
+    Method: render
+    
+    Renders a rectangle into the canvas.
+    
+    Parameters:
+    
+    type - (string) Possible options are 'fill' or 'stroke'.
+    pos - (object) An *x*, *y* object with the position of the center of the rectangle.
+    width - (number) The width of the rectangle.
+    height - (number) The height of the rectangle.
+    canvas - (object) A <Canvas> instance.
+    
+    Example:
+    (start code js)
+    NodeHelper.rectangle.render('fill', { x: 10, y: 30 }, 30, 40, viz.canvas);
+    (end code)
+    */
+    'render': function(type, pos, width, height, canvas){
+      canvas.getCtx()[type + "Rect"](pos.x - width / 2, pos.y - height / 2, 
+                                      width, height);
+    },
+    /*
+    Method: contains
+    
+    Returns *true* if *pos* is contained in the area of the shape. Returns *false* otherwise.
+    
+    Parameters:
+    
+    npos - (object) An *x*, *y* object with the <Graph.Node> position.
+    pos - (object) An *x*, *y* object with the position to check.
+    width - (number) The width of the rendered rectangle.
+    height - (number) The height of the rendered rectangle.
+    
+    Example:
+    (start code js)
+    NodeHelper.rectangle.contains({ x: 10, y: 30 }, { x: 15, y: 35 }, 30, 40);
+    (end code)
+    */
+    'contains': function(npos, pos, width, height){
+      return Math.abs(pos.x - npos.x) <= width / 2
+          && Math.abs(pos.y - npos.y) <= height / 2;
+    }
+  },
+  /*
+  Object: NodeHelper.triangle
+  */
+  'triangle': {
+    /*
+    Method: render
+    
+    Renders a triangle into the canvas.
+    
+    Parameters:
+    
+    type - (string) Possible options are 'fill' or 'stroke'.
+    pos - (object) An *x*, *y* object with the position of the center of the triangle.
+    dim - (number) The dimension of the triangle.
+    canvas - (object) A <Canvas> instance.
+    
+    Example:
+    (start code js)
+    NodeHelper.triangle.render('stroke', { x: 10, y: 30 }, 40, viz.canvas);
+    (end code)
+    */
+    'render': function(type, pos, dim, canvas){
+      var ctx = canvas.getCtx(), 
+          c1x = pos.x, 
+          c1y = pos.y - dim, 
+          c2x = c1x - dim, 
+          c2y = pos.y + dim, 
+          c3x = c1x + dim, 
+          c3y = c2y;
+      ctx.beginPath();
+      ctx.moveTo(c1x, c1y);
+      ctx.lineTo(c2x, c2y);
+      ctx.lineTo(c3x, c3y);
+      ctx.closePath();
+      ctx[type]();
+    },
+    /*
+    Method: contains
+    
+    Returns *true* if *pos* is contained in the area of the shape. Returns *false* otherwise.
+    
+    Parameters:
+    
+    npos - (object) An *x*, *y* object with the <Graph.Node> position.
+    pos - (object) An *x*, *y* object with the position to check.
+    dim - (number) The dimension of the shape.
+    
+    Example:
+    (start code js)
+    NodeHelper.triangle.contains({ x: 10, y: 30 }, { x: 15, y: 35 }, 30);
+    (end code)
+    */
+    'contains': function(npos, pos, dim) {
+      return NodeHelper.circle.contains(npos, pos, dim);
+    }
+  },
+  /*
+  Object: NodeHelper.star
+  */
+  'star': {
+    /*
+    Method: render
+    
+    Renders a star into the canvas.
+    
+    Parameters:
+    
+    type - (string) Possible options are 'fill' or 'stroke'.
+    pos - (object) An *x*, *y* object with the position of the center of the star.
+    dim - (number) The dimension of the star.
+    canvas - (object) A <Canvas> instance.
+    
+    Example:
+    (start code js)
+    NodeHelper.star.render('stroke', { x: 10, y: 30 }, 40, viz.canvas);
+    (end code)
+    */
+    'render': function(type, pos, dim, canvas){
+      var ctx = canvas.getCtx(), 
+          pi5 = Math.PI / 5;
+      ctx.save();
+      ctx.translate(pos.x, pos.y);
+      ctx.beginPath();
+      ctx.moveTo(dim, 0);
+      for (var i = 0; i < 9; i++) {
+        ctx.rotate(pi5);
+        if (i % 2 == 0) {
+          ctx.lineTo((dim / 0.525731) * 0.200811, 0);
+        } else {
+          ctx.lineTo(dim, 0);
+        }
+      }
+      ctx.closePath();
+      ctx[type]();
+      ctx.restore();
+    },
+    /*
+    Method: contains
+    
+    Returns *true* if *pos* is contained in the area of the shape. Returns *false* otherwise.
+    
+    Parameters:
+    
+    npos - (object) An *x*, *y* object with the <Graph.Node> position.
+    pos - (object) An *x*, *y* object with the position to check.
+    dim - (number) The dimension of the shape.
+    
+    Example:
+    (start code js)
+    NodeHelper.star.contains({ x: 10, y: 30 }, { x: 15, y: 35 }, 30);
+    (end code)
+    */
+    'contains': function(npos, pos, dim) {
+      return NodeHelper.circle.contains(npos, pos, dim);
+    }
+  }
+};
+
+/*
+  Object: EdgeHelper
+  
+  Contains rendering primitives for simple edge shapes.
+*/
+var EdgeHelper = {
+  /*
+    Object: EdgeHelper.line
+  */
+  'line': {
+      /*
+      Method: render
+      
+      Renders a line into the canvas.
+      
+      Parameters:
+      
+      from - (object) An *x*, *y* object with the starting position of the line.
+      to - (object) An *x*, *y* object with the ending position of the line.
+      canvas - (object) A <Canvas> instance.
+      
+      Example:
+      (start code js)
+      EdgeHelper.line.render({ x: 10, y: 30 }, { x: 10, y: 50 }, viz.canvas);
+      (end code)
+      */
+      'render': function(from, to, canvas){
+        var ctx = canvas.getCtx();
+        ctx.beginPath();
+        ctx.moveTo(from.x, from.y);
+        ctx.lineTo(to.x, to.y);
+        ctx.stroke();
+      },
+      /*
+      Method: contains
+      
+      Returns *true* if *pos* is contained in the area of the shape. Returns *false* otherwise.
+      
+      Parameters:
+      
+      posFrom - (object) An *x*, *y* object with a <Graph.Node> position.
+      posTo - (object) An *x*, *y* object with a <Graph.Node> position.
+      pos - (object) An *x*, *y* object with the position to check.
+      epsilon - (number) The dimension of the shape.
+      
+      Example:
+      (start code js)
+      EdgeHelper.line.contains({ x: 10, y: 30 }, { x: 15, y: 35 }, { x: 15, y: 35 }, 30);
+      (end code)
+      */
+      'contains': function(posFrom, posTo, pos, epsilon) {
+        var min = Math.min, 
+            max = Math.max,
+            minPosX = min(posFrom.x, posTo.x),
+            maxPosX = max(posFrom.x, posTo.x),
+            minPosY = min(posFrom.y, posTo.y),
+            maxPosY = max(posFrom.y, posTo.y);
+        
+        if(pos.x >= minPosX && pos.x <= maxPosX 
+            && pos.y >= minPosY && pos.y <= maxPosY) {
+          if(Math.abs(posTo.x - posFrom.x) <= epsilon) {
+            return true;
+          }
+          var dist = (posTo.y - posFrom.y) / (posTo.x - posFrom.x) * (pos.x - posFrom.x) + posFrom.y;
+          return Math.abs(dist - pos.y) <= epsilon;
+        }
+        return false;
+      }
+    },
+  /*
+    Object: EdgeHelper.arrow
+  */
+  'arrow': {
+      /*
+      Method: render
+      
+      Renders an arrow into the canvas.
+      
+      Parameters:
+      
+      from - (object) An *x*, *y* object with the starting position of the arrow.
+      to - (object) An *x*, *y* object with the ending position of the arrow.
+      dim - (number) The dimension of the arrow.
+      swap - (boolean) Whether to set the arrow pointing to the starting position or the ending position.
+      canvas - (object) A <Canvas> instance.
+      
+      Example:
+      (start code js)
+      EdgeHelper.arrow.render({ x: 10, y: 30 }, { x: 10, y: 50 }, 13, false, viz.canvas);
+      (end code)
+      */
+    'render': function(from, to, dim, swap, canvas){
+        var ctx = canvas.getCtx();
+        // invert edge direction
+        if (swap) {
+          var tmp = from;
+          from = to;
+          to = tmp;
+        }
+        var vect = new Complex(to.x - from.x, to.y - from.y);
+        vect.$scale(dim / vect.norm());
+        var intermediatePoint = new Complex(to.x - vect.x, to.y - vect.y),
+            normal = new Complex(-vect.y / 2, vect.x / 2),
+            v1 = intermediatePoint.add(normal), 
+            v2 = intermediatePoint.$add(normal.$scale(-1));
+        
+        ctx.beginPath();
+        ctx.moveTo(from.x, from.y);
+        ctx.lineTo(to.x, to.y);
+        ctx.stroke();
+        ctx.beginPath();
+        ctx.moveTo(v1.x, v1.y);
+        ctx.lineTo(v2.x, v2.y);
+        ctx.lineTo(to.x, to.y);
+        ctx.closePath();
+        ctx.fill();
+    },
+    /*
+    Method: contains
+    
+    Returns *true* if *pos* is contained in the area of the shape. Returns *false* otherwise.
+    
+    Parameters:
+    
+    posFrom - (object) An *x*, *y* object with a <Graph.Node> position.
+    posTo - (object) An *x*, *y* object with a <Graph.Node> position.
+    pos - (object) An *x*, *y* object with the position to check.
+    epsilon - (number) The dimension of the shape.
+    
+    Example:
+    (start code js)
+    EdgeHelper.arrow.contains({ x: 10, y: 30 }, { x: 15, y: 35 }, { x: 15, y: 35 }, 30);
+    (end code)
+    */
+    'contains': function(posFrom, posTo, pos, epsilon) {
+      return EdgeHelper.line.contains(posFrom, posTo, pos, epsilon);
+    }
+  },
+  /*
+    Object: EdgeHelper.hyperline
+  */
+  'hyperline': {
+    /*
+    Method: render
+    
+    Renders a hyperline into the canvas. A hyperline are the lines drawn for the <Hypertree> visualization.
+    
+    Parameters:
+    
+    from - (object) An *x*, *y* object with the starting position of the hyperline. *x* and *y* must belong to [0, 1).
+    to - (object) An *x*, *y* object with the ending position of the hyperline. *x* and *y* must belong to [0, 1).
+    r - (number) The scaling factor.
+    canvas - (object) A <Canvas> instance.
+    
+    Example:
+    (start code js)
+    EdgeHelper.hyperline.render({ x: 10, y: 30 }, { x: 10, y: 50 }, 100, viz.canvas);
+    (end code)
+    */
+    'render': function(from, to, r, canvas){
+      var ctx = canvas.getCtx();  
+      var centerOfCircle = computeArcThroughTwoPoints(from, to);
+      if (centerOfCircle.a > 1000 || centerOfCircle.b > 1000
+          || centerOfCircle.ratio < 0) {
+        ctx.beginPath();
+        ctx.moveTo(from.x * r, from.y * r);
+        ctx.lineTo(to.x * r, to.y * r);
+        ctx.stroke();
+      } else {
+        var angleBegin = Math.atan2(to.y - centerOfCircle.y, to.x
+            - centerOfCircle.x);
+        var angleEnd = Math.atan2(from.y - centerOfCircle.y, from.x
+            - centerOfCircle.x);
+        var sense = sense(angleBegin, angleEnd);
+        ctx.beginPath();
+        ctx.arc(centerOfCircle.x * r, centerOfCircle.y * r, centerOfCircle.ratio
+            * r, angleBegin, angleEnd, sense);
+        ctx.stroke();
+      }
+      /*      
+        Calculates the arc parameters through two points.
+        
+        More information in <http://en.wikipedia.org/wiki/Poincar%C3%A9_disc_model#Analytic_geometry_constructions_in_the_hyperbolic_plane> 
+      
+        Parameters:
+      
+        p1 - A <Complex> instance.
+        p2 - A <Complex> instance.
+        scale - The Disk's diameter.
+      
+        Returns:
+      
+        An object containing some arc properties.
+      */
+      function computeArcThroughTwoPoints(p1, p2){
+        var aDen = (p1.x * p2.y - p1.y * p2.x), bDen = aDen;
+        var sq1 = p1.squaredNorm(), sq2 = p2.squaredNorm();
+        // Fall back to a straight line
+        if (aDen == 0)
+          return {
+            x: 0,
+            y: 0,
+            ratio: -1
+          };
+    
+        var a = (p1.y * sq2 - p2.y * sq1 + p1.y - p2.y) / aDen;
+        var b = (p2.x * sq1 - p1.x * sq2 + p2.x - p1.x) / bDen;
+        var x = -a / 2;
+        var y = -b / 2;
+        var squaredRatio = (a * a + b * b) / 4 - 1;
+        // Fall back to a straight line
+        if (squaredRatio < 0)
+          return {
+            x: 0,
+            y: 0,
+            ratio: -1
+          };
+        var ratio = Math.sqrt(squaredRatio);
+        var out = {
+          x: x,
+          y: y,
+          ratio: ratio > 1000? -1 : ratio,
+          a: a,
+          b: b
+        };
+    
+        return out;
+      }
+      /*      
+        Sets angle direction to clockwise (true) or counterclockwise (false). 
+         
+        Parameters: 
+      
+           angleBegin - Starting angle for drawing the arc. 
+           angleEnd - The HyperLine will be drawn from angleBegin to angleEnd. 
+      
+        Returns: 
+      
+           A Boolean instance describing the sense for drawing the HyperLine. 
+      */
+      function sense(angleBegin, angleEnd){
+        return (angleBegin < angleEnd)? ((angleBegin + Math.PI > angleEnd)? false
+            : true) : ((angleEnd + Math.PI > angleBegin)? true : false);
+      }
+    },
+    /*
+    Method: contains
+    
+    Not Implemented
+    
+    Returns *true* if *pos* is contained in the area of the shape. Returns *false* otherwise.
+    
+    Parameters:
+    
+    posFrom - (object) An *x*, *y* object with a <Graph.Node> position.
+    posTo - (object) An *x*, *y* object with a <Graph.Node> position.
+    pos - (object) An *x*, *y* object with the position to check.
+    epsilon - (number) The dimension of the shape.
+    
+    Example:
+    (start code js)
+    EdgeHelper.hyperline.contains({ x: 10, y: 30 }, { x: 15, y: 35 }, { x: 15, y: 35 }, 30);
+    (end code)
+    */
+    'contains': $.lambda(false)
+  }
+};
+
+
+/*
+ * File: Graph.Plot.js
+ */
+
+/*
+   Object: Graph.Plot
+
+   <Graph> rendering and animation methods.
+   
+   Properties:
+   
+   nodeHelper - <NodeHelper> object.
+   edgeHelper - <EdgeHelper> object.
+*/
+Graph.Plot = {
+    //Default intializer
+    initialize: function(viz, klass){
+      this.viz = viz;
+      this.config = viz.config;
+      this.node = viz.config.Node;
+      this.edge = viz.config.Edge;
+      this.animation = new Animation;
+      this.nodeTypes = new klass.Plot.NodeTypes;
+      this.edgeTypes = new klass.Plot.EdgeTypes;
+      this.labels = viz.labels;
+   },
+
+    //Add helpers
+    nodeHelper: NodeHelper,
+    edgeHelper: EdgeHelper,
+    
+    Interpolator: {
+        //node/edge property parsers
+        'map': {
+          'border': 'color',
+          'color': 'color',
+          'width': 'number',
+          'height': 'number',
+          'dim': 'number',
+          'alpha': 'number',
+          'lineWidth': 'number',
+          'angularWidth':'number',
+          'span':'number',
+          'valueArray':'array-number',
+          'dimArray':'array-number'
+          //'colorArray':'array-color'
+        },
+        
+        //canvas specific parsers
+        'canvas': {
+          'globalAlpha': 'number',
+          'fillStyle': 'color',
+          'strokeStyle': 'color',
+          'lineWidth': 'number',
+          'shadowBlur': 'number',
+          'shadowColor': 'color',
+          'shadowOffsetX': 'number',
+          'shadowOffsetY': 'number',
+          'miterLimit': 'number'
+        },
+  
+        //label parsers
+        'label': {
+          'size': 'number',
+          'color': 'color'
+        },
+  
+        //Number interpolator
+        'compute': function(from, to, delta) {
+          return from + (to - from) * delta;
+        },
+        
+        //Position interpolators
+        'moebius': function(elem, props, delta, vector) {
+          var v = vector.scale(-delta);  
+          if(v.norm() < 1) {
+              var x = v.x, y = v.y;
+              var ans = elem.startPos
+                .getc().moebiusTransformation(v);
+              elem.pos.setc(ans.x, ans.y);
+              v.x = x; v.y = y;
+            }           
+        },
+
+        'linear': function(elem, props, delta) {
+            var from = elem.startPos.getc(true);
+            var to = elem.endPos.getc(true);
+            elem.pos.setc(this.compute(from.x, to.x, delta), 
+                          this.compute(from.y, to.y, delta));
+        },
+
+        'polar': function(elem, props, delta) {
+          var from = elem.startPos.getp(true);
+          var to = elem.endPos.getp();
+          var ans = to.interpolate(from, delta);
+          elem.pos.setp(ans.theta, ans.rho);
+        },
+        
+        //Graph's Node/Edge interpolators
+        'number': function(elem, prop, delta, getter, setter) {
+          var from = elem[getter](prop, 'start');
+          var to = elem[getter](prop, 'end');
+          elem[setter](prop, this.compute(from, to, delta));
+        },
+
+        'color': function(elem, prop, delta, getter, setter) {
+          var from = $.hexToRgb(elem[getter](prop, 'start'));
+          var to = $.hexToRgb(elem[getter](prop, 'end'));
+          var comp = this.compute;
+          var val = $.rgbToHex([parseInt(comp(from[0], to[0], delta)),
+                                parseInt(comp(from[1], to[1], delta)),
+                                parseInt(comp(from[2], to[2], delta))]);
+          
+          elem[setter](prop, val);
+        },
+        
+        'array-number': function(elem, prop, delta, getter, setter) {
+          var from = elem[getter](prop, 'start'),
+              to = elem[getter](prop, 'end'),
+              cur = [];
+          for(var i=0, l=from.length; i<l; i++) {
+            var fromi = from[i], toi = to[i];
+            if(fromi.length) {
+              for(var j=0, len=fromi.length, curi=[]; j<len; j++) {
+                curi.push(this.compute(fromi[j], toi[j], delta));
+              }
+              cur.push(curi);
+            } else {
+              cur.push(this.compute(fromi, toi, delta));
+            }
+          }
+          elem[setter](prop, cur);
+        },
+        
+        'node': function(elem, props, delta, map, getter, setter) {
+          map = this[map];
+          if(props) {
+            var len = props.length;
+            for(var i=0; i<len; i++) {
+              var pi = props[i];
+              this[map[pi]](elem, pi, delta, getter, setter);
+            }
+          } else {
+            for(var pi in map) {
+              this[map[pi]](elem, pi, delta, getter, setter);
+            }
+          }
+        },
+        
+        'edge': function(elem, props, delta, mapKey, getter, setter) {
+            var adjs = elem.adjacencies;
+            for(var id in adjs) this['node'](adjs[id], props, delta, mapKey, getter, setter);
+        },
+        
+        'node-property': function(elem, props, delta) {
+          this['node'](elem, props, delta, 'map', 'getData', 'setData');
+        },
+        
+        'edge-property': function(elem, props, delta) {
+          this['edge'](elem, props, delta, 'map', 'getData', 'setData');  
+        },
+
+        'label-property': function(elem, props, delta) {
+          this['node'](elem, props, delta, 'label', 'getLabelData', 'setLabelData');
+        },
+        
+        'node-style': function(elem, props, delta) {
+          this['node'](elem, props, delta, 'canvas', 'getCanvasStyle', 'setCanvasStyle');
+        },
+        
+        'edge-style': function(elem, props, delta) {
+          this['edge'](elem, props, delta, 'canvas', 'getCanvasStyle', 'setCanvasStyle');  
+        }
+    },
+    
+  
+    /*
+       sequence
+    
+       Iteratively performs an action while refreshing the state of the visualization.
+
+       Parameters:
+
+       options - (object) An object containing some sequence options described below
+       condition - (function) A function returning a boolean instance in order to stop iterations.
+       step - (function) A function to execute on each step of the iteration.
+       onComplete - (function) A function to execute when the sequence finishes.
+       duration - (number) Duration (in milliseconds) of each step.
+
+      Example:
+       (start code js)
+        var rg = new $jit.RGraph(options);
+        var i = 0;
+        rg.fx.sequence({
+          condition: function() {
+           return i == 10;
+          },
+          step: function() {
+            alert(i++);
+          },
+          onComplete: function() {
+           alert('done!');
+          }
+        });
+       (end code)
+
+    */
+    sequence: function(options) {
+        var that = this;
+        options = $.merge({
+          condition: $.lambda(false),
+          step: $.empty,
+          onComplete: $.empty,
+          duration: 200
+        }, options || {});
+
+        var interval = setInterval(function() {
+          if(options.condition()) {
+            options.step();
+          } else {
+            clearInterval(interval);
+            options.onComplete();
+          }
+          that.viz.refresh(true);
+        }, options.duration);
+    },
+    
+    /*
+      prepare
+ 
+      Prepare graph position and other attribute values before performing an Animation. 
+      This method is used internally by the Toolkit.
+      
+      See also:
+       
+       <Animation>, <Graph.Plot.animate>
+
+    */
+    prepare: function(modes) {
+      var graph = this.viz.graph,
+          accessors = {
+            'node-property': {
+              'getter': 'getData',
+              'setter': 'setData'
+            },
+            'edge-property': {
+              'getter': 'getData',
+              'setter': 'setData'
+            },
+            'node-style': {
+              'getter': 'getCanvasStyle',
+              'setter': 'setCanvasStyle'
+            },
+            'edge-style': {
+              'getter': 'getCanvasStyle',
+              'setter': 'setCanvasStyle'
+            }
+          };
+
+      //parse modes
+      var m = {};
+      if($.type(modes) == 'array') {
+        for(var i=0, len=modes.length; i < len; i++) {
+          var elems = modes[i].split(':');
+          m[elems.shift()] = elems;
+        }
+      } else {
+        for(var p in modes) {
+          if(p == 'position') {
+            m[modes.position] = [];
+          } else {
+            m[p] = $.splat(modes[p]);
+          }
+        }
+      }
+      
+      graph.eachNode(function(node) { 
+        node.startPos.set(node.pos);
+        $.each(['node-property', 'node-style'], function(p) {
+          if(p in m) {
+            var prop = m[p];
+            for(var i=0, l=prop.length; i < l; i++) {
+              node[accessors[p].setter](prop[i], node[accessors[p].getter](prop[i]), 'start');
+            }
+          }
+        });
+        $.each(['edge-property', 'edge-style'], function(p) {
+          if(p in m) {
+            var prop = m[p];
+            node.eachAdjacency(function(adj) {
+              for(var i=0, l=prop.length; i < l; i++) {
+                adj[accessors[p].setter](prop[i], adj[accessors[p].getter](prop[i]), 'start');
+              }
+            });
+          }
+        });
+      });
+      return m;
+    },
+    
+    /*
+       Method: animate
+    
+       Animates a <Graph> by interpolating some <Graph.Node>, <Graph.Adjacence> or <Graph.Label> properties.
+
+       Parameters:
+
+       opt - (object) Animation options. The object properties are described below
+       duration - (optional) Described in <Options.Fx>.
+       fps - (optional) Described in <Options.Fx>.
+       hideLabels - (optional|boolean) Whether to hide labels during the animation.
+       modes - (required|object) An object with animation modes (described below).
+
+       Animation modes:
+       
+       Animation modes are strings representing different node/edge and graph properties that you'd like to animate. 
+       They are represented by an object that has as keys main categories of properties to animate and as values a list 
+       of these specific properties. The properties are described below
+       
+       position - Describes the way nodes' positions must be interpolated. Possible values are 'linear', 'polar' or 'moebius'.
+       node-property - Describes which Node properties will be interpolated. These properties can be any of the ones defined in <Options.Node>.
+       edge-property - Describes which Edge properties will be interpolated. These properties can be any the ones defined in <Options.Edge>.
+       label-property - Describes which Label properties will be interpolated. These properties can be any of the ones defined in <Options.Label> like color or size.
+       node-style - Describes which Node Canvas Styles will be interpolated. These are specific canvas properties like fillStyle, strokeStyle, lineWidth, shadowBlur, shadowColor, shadowOffsetX, shadowOffsetY, etc.
+       edge-style - Describes which Edge Canvas Styles will be interpolated. These are specific canvas properties like fillStyle, strokeStyle, lineWidth, shadowBlur, shadowColor, shadowOffsetX, shadowOffsetY, etc.
+
+       Example:
+       (start code js)
+       var viz = new $jit.Viz(options);
+       //...tweak some Data, CanvasStyles or LabelData properties...
+       viz.fx.animate({
+         modes: {
+           'position': 'linear',
+           'node-property': ['width', 'height'],
+           'node-style': 'shadowColor',
+           'label-property': 'size'
+         },
+         hideLabels: false
+       });
+       //...can also be written like this...
+       viz.fx.animate({
+         modes: ['linear',
+                 'node-property:width:height',
+                 'node-style:shadowColor',
+                 'label-property:size'],
+         hideLabels: false
+       });
+       (end code)
+    */
+    animate: function(opt, versor) {
+      opt = $.merge(this.viz.config, opt || {});
+      var that = this,
+          viz = this.viz,
+          graph  = viz.graph,
+          interp = this.Interpolator,
+          animation =  opt.type === 'nodefx'? this.nodeFxAnimation : this.animation;
+      //prepare graph values
+      var m = this.prepare(opt.modes);
+      
+      //animate
+      if(opt.hideLabels) this.labels.hideLabels(true);
+      animation.setOptions($.merge(opt, {
+        $animating: false,
+        compute: function(delta) {
+          graph.eachNode(function(node) { 
+            for(var p in m) {
+              interp[p](node, m[p], delta, versor);
+            }
+          });
+          that.plot(opt, this.$animating, delta);
+          this.$animating = true;
+        },
+        complete: function() {
+          if(opt.hideLabels) that.labels.hideLabels(false);
+          that.plot(opt);
+          opt.onComplete();
+          opt.onAfterCompute();
+        }       
+      })).start();
+    },
+    
+    /*
+      nodeFx
+   
+      Apply animation to node properties like color, width, height, dim, etc.
+  
+      Parameters:
+  
+      options - Animation options. This object properties is described below
+      elements - The Elements to be transformed. This is an object that has a properties
+      
+      (start code js)
+      'elements': {
+        //can also be an array of ids
+        'id': 'id-of-node-to-transform',
+        //properties to be modified. All properties are optional.
+        'properties': {
+          'color': '#ccc', //some color
+          'width': 10, //some width
+          'height': 10, //some height
+          'dim': 20, //some dim
+          'lineWidth': 10 //some line width
+        } 
+      }
+      (end code)
+      
+      - _reposition_ Whether to recalculate positions and add a motion animation. 
+      This might be used when changing _width_ or _height_ properties in a <Layouts.Tree> like layout. Default's *false*.
+      
+      - _onComplete_ A method that is called when the animation completes.
+      
+      ...and all other <Graph.Plot.animate> options like _duration_, _fps_, _transition_, etc.
+  
+      Example:
+      (start code js)
+       var rg = new RGraph(canvas, config); //can be also Hypertree or ST
+       rg.fx.nodeFx({
+         'elements': {
+           'id':'mynodeid',
+           'properties': {
+             'color':'#ccf'
+           },
+           'transition': Trans.Quart.easeOut
+         }
+       });
+      (end code)    
+   */
+   nodeFx: function(opt) {
+     var viz = this.viz,
+         graph  = viz.graph,
+         animation = this.nodeFxAnimation,
+         options = $.merge(this.viz.config, {
+           'elements': {
+             'id': false,
+             'properties': {}
+           },
+           'reposition': false
+         });
+     opt = $.merge(options, opt || {}, {
+       onBeforeCompute: $.empty,
+       onAfterCompute: $.empty
+     });
+     //check if an animation is running
+     animation.stopTimer();
+     var props = opt.elements.properties;
+     //set end values for nodes
+     if(!opt.elements.id) {
+       graph.eachNode(function(n) {
+         for(var prop in props) {
+           n.setData(prop, props[prop], 'end');
+         }
+       });
+     } else {
+       var ids = $.splat(opt.elements.id);
+       $.each(ids, function(id) {
+         var n = graph.getNode(id);
+         if(n) {
+           for(var prop in props) {
+             n.setData(prop, props[prop], 'end');
+           }
+         }
+       });
+     }
+     //get keys
+     var propnames = [];
+     for(var prop in props) propnames.push(prop);
+     //add node properties modes
+     var modes = ['node-property:' + propnames.join(':')];
+     //set new node positions
+     if(opt.reposition) {
+       modes.push('linear');
+       viz.compute('end');
+     }
+     //animate
+     this.animate($.merge(opt, {
+       modes: modes,
+       type: 'nodefx'
+     }));
+   },
+
+    
+    /*
+       Method: plot
+    
+       Plots a <Graph>.
+
+       Parameters:
+
+       opt - (optional) Plotting options. Most of them are described in <Options.Fx>.
+
+       Example:
+
+       (start code js)
+       var viz = new $jit.Viz(options);
+       viz.fx.plot(); 
+       (end code)
+
+    */
+    plot: function(opt, animating) {
+      var viz = this.viz, 
+      aGraph = viz.graph, 
+      canvas = viz.canvas, 
+      id = viz.root, 
+      that = this, 
+      ctx = canvas.getCtx(), 
+      min = Math.min,
+      opt = opt || this.viz.controller;
+      opt.clearCanvas && canvas.clear();
+        
+      var root = aGraph.getNode(id);
+      if(!root) return;
+      
+      var T = !!root.visited;
+      aGraph.eachNode(function(node) {
+        var nodeAlpha = node.getData('alpha');
+        node.eachAdjacency(function(adj) {
+          var nodeTo = adj.nodeTo;
+          if(!!nodeTo.visited === T && node.drawn && nodeTo.drawn) {
+            !animating && opt.onBeforePlotLine(adj);
+            ctx.save();
+            ctx.globalAlpha = min(nodeAlpha, 
+                nodeTo.getData('alpha'), 
+                adj.getData('alpha'));
+            that.plotLine(adj, canvas, animating);
+            ctx.restore();
+            !animating && opt.onAfterPlotLine(adj);
+          }
+        });
+        ctx.save();
+        if(node.drawn) {
+          !animating && opt.onBeforePlotNode(node);
+          that.plotNode(node, canvas, animating);
+          !animating && opt.onAfterPlotNode(node);
+        }
+        if(!that.labelsHidden && opt.withLabels) {
+          if(node.drawn && nodeAlpha >= 0.95) {
+            that.labels.plotLabel(canvas, node, opt);
+          } else {
+            that.labels.hideLabel(node, false);
+          }
+        }
+        ctx.restore();
+        node.visited = !T;
+      });
+    },
+
+  /*
+      Plots a Subtree.
+   */
+   plotTree: function(node, opt, animating) {
+       var that = this, 
+       viz = this.viz, 
+       canvas = viz.canvas,
+       config = this.config,
+       ctx = canvas.getCtx();
+       var nodeAlpha = node.getData('alpha');
+       node.eachSubnode(function(elem) {
+         if(opt.plotSubtree(node, elem) && elem.exist && elem.drawn) {
+             var adj = node.getAdjacency(elem.id);
+             !animating && opt.onBeforePlotLine(adj);
+             ctx.globalAlpha = Math.min(nodeAlpha, elem.getData('alpha'));
+             that.plotLine(adj, canvas, animating);
+             !animating && opt.onAfterPlotLine(adj);
+             that.plotTree(elem, opt, animating);
+         }
+       });
+       if(node.drawn) {
+           !animating && opt.onBeforePlotNode(node);
+           this.plotNode(node, canvas, animating);
+           !animating && opt.onAfterPlotNode(node);
+           if(!opt.hideLabels && opt.withLabels && nodeAlpha >= 0.95) 
+               this.labels.plotLabel(canvas, node, opt);
+           else 
+               this.labels.hideLabel(node, false);
+       } else {
+           this.labels.hideLabel(node, true);
+       }
+   },
+
+  /*
+       Method: plotNode
+    
+       Plots a <Graph.Node>.
+
+       Parameters:
+       
+       node - (object) A <Graph.Node>.
+       canvas - (object) A <Canvas> element.
+
+    */
+    plotNode: function(node, canvas, animating) {
+        var f = node.getData('type'), 
+            ctxObj = this.node.CanvasStyles;
+        if(f != 'none') {
+          var width = node.getData('lineWidth'),
+              color = node.getData('color'),
+              alpha = node.getData('alpha'),
+              ctx = canvas.getCtx();
+          
+          ctx.lineWidth = width;
+          ctx.fillStyle = ctx.strokeStyle = color;
+          ctx.globalAlpha = alpha;
+          
+          for(var s in ctxObj) {
+            ctx[s] = node.getCanvasStyle(s);
+          }
+
+          this.nodeTypes[f].render.call(this, node, canvas, animating);
+        }
+    },
+    
+    /*
+       Method: plotLine
+    
+       Plots a <Graph.Adjacence>.
+
+       Parameters:
+
+       adj - (object) A <Graph.Adjacence>.
+       canvas - (object) A <Canvas> instance.
+
+    */
+    plotLine: function(adj, canvas, animating) {
+      var f = adj.getData('type'),
+          ctxObj = this.edge.CanvasStyles;
+      if(f != 'none') {
+        var width = adj.getData('lineWidth'),
+            color = adj.getData('color'),
+            ctx = canvas.getCtx();
+        
+        ctx.lineWidth = width;
+        ctx.fillStyle = ctx.strokeStyle = color;
+        
+        for(var s in ctxObj) {
+          ctx[s] = adj.getCanvasStyle(s);
+        }
+
+        this.edgeTypes[f].render.call(this, adj, canvas, animating);
+      }
+    }    
+  
+};
+
+
+
+/*
+ * File: Graph.Label.js
+ *
+*/
+
+/*
+   Object: Graph.Label
+
+   An interface for plotting/hiding/showing labels.
+
+   Description:
+
+   This is a generic interface for plotting/hiding/showing labels.
+   The <Graph.Label> interface is implemented in multiple ways to provide
+   different label types.
+
+   For example, the Graph.Label interface is implemented as <Graph.Label.HTML> to provide
+   HTML label elements. Also we provide the <Graph.Label.SVG> interface for SVG type labels. 
+   The <Graph.Label.Native> interface implements these methods with the native Canvas text rendering functions.
+   
+   All subclasses (<Graph.Label.HTML>, <Graph.Label.SVG> and <Graph.Label.Native>) implement the method plotLabel.
+*/
+
+Graph.Label = {};
+
+/*
+   Class: Graph.Label.Native
+
+   Implements labels natively, using the Canvas text API.
+*/
+Graph.Label.Native = new Class({
+    /*
+       Method: plotLabel
+
+       Plots a label for a given node.
+
+       Parameters:
+
+       canvas - (object) A <Canvas> instance.
+       node - (object) A <Graph.Node>.
+       controller - (object) A configuration object.
+       
+       Example:
+       
+       (start code js)
+       var viz = new $jit.Viz(options);
+       var node = viz.graph.getNode('nodeId');
+       viz.labels.plotLabel(viz.canvas, node, viz.config);
+       (end code)
+    */
+    plotLabel: function(canvas, node, controller) {
+      var ctx = canvas.getCtx();
+      var pos = node.pos.getc(true);
+
+      ctx.font = node.getLabelData('style') + ' ' + node.getLabelData('size') + 'px ' + node.getLabelData('family');
+      ctx.textAlign = node.getLabelData('textAlign');
+      ctx.fillStyle = ctx.strokeStyle = node.getLabelData('color');
+      ctx.textBaseline = node.getLabelData('textBaseline');
+
+      this.renderLabel(canvas, node, controller);
+    },
+
+    /*
+       renderLabel
+
+       Does the actual rendering of the label in the canvas. The default
+       implementation renders the label close to the position of the node, this
+       method should be overriden to position the labels differently.
+
+       Parameters:
+
+       canvas - A <Canvas> instance.
+       node - A <Graph.Node>.
+       controller - A configuration object. See also <Hypertree>, <RGraph>, <ST>.
+    */
+    renderLabel: function(canvas, node, controller) {
+      var ctx = canvas.getCtx();
+      var pos = node.pos.getc(true);
+      ctx.fillText(node.name, pos.x, pos.y + node.getData("height") / 2);
+    },
+
+    hideLabel: $.empty,
+    hideLabels: $.empty
+});
+
+/*
+   Class: Graph.Label.DOM
+
+   Abstract Class implementing some DOM label methods.
+
+   Implemented by:
+
+   <Graph.Label.HTML> and <Graph.Label.SVG>.
+
+*/
+Graph.Label.DOM = new Class({
+    //A flag value indicating if node labels are being displayed or not.
+    labelsHidden: false,
+    //Label container
+    labelContainer: false,
+    //Label elements hash.
+    labels: {},
+
+    /*
+       Method: getLabelContainer
+
+       Lazy fetcher for the label container.
+
+       Returns:
+
+       The label container DOM element.
+
+       Example:
+
+      (start code js)
+        var viz = new $jit.Viz(options);
+        var labelContainer = viz.labels.getLabelContainer();
+        alert(labelContainer.innerHTML);
+      (end code)
+    */
+    getLabelContainer: function() {
+      return this.labelContainer ?
+        this.labelContainer :
+        this.labelContainer = document.getElementById(this.viz.config.labelContainer);
+    },
+
+    /*
+       Method: getLabel
+
+       Lazy fetcher for the label element.
+
+       Parameters:
+
+       id - (string) The label id (which is also a <Graph.Node> id).
+
+       Returns:
+
+       The label element.
+
+       Example:
+
+      (start code js)
+        var viz = new $jit.Viz(options);
+        var label = viz.labels.getLabel('someid');
+        alert(label.innerHTML);
+      (end code)
+
+    */
+    getLabel: function(id) {
+      return (id in this.labels && this.labels[id] != null) ?
+        this.labels[id] :
+        this.labels[id] = document.getElementById(id);
+    },
+
+    /*
+       Method: hideLabels
+
+       Hides all labels (by hiding the label container).
+
+       Parameters:
+
+       hide - (boolean) A boolean value indicating if the label container must be hidden or not.
+
+       Example:
+       (start code js)
+        var viz = new $jit.Viz(options);
+        rg.labels.hideLabels(true);
+       (end code)
+
+    */
+    hideLabels: function (hide) {
+      var container = this.getLabelContainer();
+      if(hide)
+        container.style.display = 'none';
+      else
+        container.style.display = '';
+      this.labelsHidden = hide;
+    },
+
+    /*
+       Method: clearLabels
+
+       Clears the label container.
+
+       Useful when using a new visualization with the same canvas element/widget.
+
+       Parameters:
+
+       force - (boolean) Forces deletion of all labels.
+
+       Example:
+       (start code js)
+        var viz = new $jit.Viz(options);
+        viz.labels.clearLabels();
+        (end code)
+    */
+    clearLabels: function(force) {
+      for(var id in this.labels) {
+        if (force || !this.viz.graph.hasNode(id)) {
+          this.disposeLabel(id);
+          delete this.labels[id];
+        }
+      }
+    },
+
+    /*
+       Method: disposeLabel
+
+       Removes a label.
+
+       Parameters:
+
+       id - (string) A label id (which generally is also a <Graph.Node> id).
+
+       Example:
+       (start code js)
+        var viz = new $jit.Viz(options);
+        viz.labels.disposeLabel('labelid');
+       (end code)
+    */
+    disposeLabel: function(id) {
+      var elem = this.getLabel(id);
+      if(elem && elem.parentNode) {
+        elem.parentNode.removeChild(elem);
+      }
+    },
+
+    /*
+       Method: hideLabel
+
+       Hides the corresponding <Graph.Node> label.
+
+       Parameters:
+
+       node - (object) A <Graph.Node>. Can also be an array of <Graph.Nodes>.
+       show - (boolean) If *true*, nodes will be shown. Otherwise nodes will be hidden.
+
+       Example:
+       (start code js)
+        var rg = new $jit.Viz(options);
+        viz.labels.hideLabel(viz.graph.getNode('someid'), false);
+       (end code)
+    */
+    hideLabel: function(node, show) {
+      node = $.splat(node);
+      var st = show ? "" : "none", lab, that = this;
+      $.each(node, function(n) {
+        var lab = that.getLabel(n.id);
+        if (lab) {
+          lab.style.display = st;
+        }
+      });
+    },
+
+    /*
+       fitsInCanvas
+
+       Returns _true_ or _false_ if the label for the node is contained in the canvas dom element or not.
+
+       Parameters:
+
+       pos - A <Complex> instance (I'm doing duck typing here so any object with _x_ and _y_ parameters will do).
+       canvas - A <Canvas> instance.
+
+       Returns:
+
+       A boolean value specifying if the label is contained in the <Canvas> DOM element or not.
+
+    */
+    fitsInCanvas: function(pos, canvas) {
+      var size = canvas.getSize();
+      if(pos.x >= size.width || pos.x < 0
+         || pos.y >= size.height || pos.y < 0) return false;
+       return true;
+    }
+});
+
+/*
+   Class: Graph.Label.HTML
+
+   Implements HTML labels.
+
+   Extends:
+
+   All <Graph.Label.DOM> methods.
+
+*/
+Graph.Label.HTML = new Class({
+    Implements: Graph.Label.DOM,
+
+    /*
+       Method: plotLabel
+
+       Plots a label for a given node.
+
+       Parameters:
+
+       canvas - (object) A <Canvas> instance.
+       node - (object) A <Graph.Node>.
+       controller - (object) A configuration object.
+       
+      Example:
+       
+       (start code js)
+       var viz = new $jit.Viz(options);
+       var node = viz.graph.getNode('nodeId');
+       viz.labels.plotLabel(viz.canvas, node, viz.config);
+       (end code)
+
+
+    */
+    plotLabel: function(canvas, node, controller) {
+      var id = node.id, tag = this.getLabel(id);
+
+      if(!tag && !(tag = document.getElementById(id))) {
+        tag = document.createElement('div');
+        var container = this.getLabelContainer();
+        tag.id = id;
+        tag.className = 'node';
+        tag.style.position = 'absolute';
+        controller.onCreateLabel(tag, node);
+        container.appendChild(tag);
+        this.labels[node.id] = tag;
+      }
+
+      this.placeLabel(tag, node, controller);
+    }
+});
+
+/*
+   Class: Graph.Label.SVG
+
+   Implements SVG labels.
+
+   Extends:
+
+   All <Graph.Label.DOM> methods.
+*/
+Graph.Label.SVG = new Class({
+    Implements: Graph.Label.DOM,
+
+    /*
+       Method: plotLabel
+
+       Plots a label for a given node.
+
+       Parameters:
+
+       canvas - (object) A <Canvas> instance.
+       node - (object) A <Graph.Node>.
+       controller - (object) A configuration object.
+       
+       Example:
+       
+       (start code js)
+       var viz = new $jit.Viz(options);
+       var node = viz.graph.getNode('nodeId');
+       viz.labels.plotLabel(viz.canvas, node, viz.config);
+       (end code)
+
+
+    */
+    plotLabel: function(canvas, node, controller) {
+      var id = node.id, tag = this.getLabel(id);
+      if(!tag && !(tag = document.getElementById(id))) {
+        var ns = 'http://www.w3.org/2000/svg';
+          tag = document.createElementNS(ns, 'svg:text');
+        var tspan = document.createElementNS(ns, 'svg:tspan');
+        tag.appendChild(tspan);
+        var container = this.getLabelContainer();
+        tag.setAttribute('id', id);
+        tag.setAttribute('class', 'node');
+        container.appendChild(tag);
+        controller.onCreateLabel(tag, node);
+        this.labels[node.id] = tag;
+      }
+      this.placeLabel(tag, node, controller);
+    }
+});
+
+
+
+Graph.Geom = new Class({
+
+  initialize: function(viz) {
+    this.viz = viz;
+    this.config = viz.config;
+    this.node = viz.config.Node;
+    this.edge = viz.config.Edge;
+  },
+  /*
+    Applies a translation to the tree.
+  
+    Parameters:
+  
+    pos - A <Complex> number specifying translation vector.
+    prop - A <Graph.Node> position property ('pos', 'start' or 'end').
+  
+    Example:
+  
+    (start code js)
+      st.geom.translate(new Complex(300, 100), 'end');
+    (end code)
+  */  
+  translate: function(pos, prop) {
+     prop = $.splat(prop);
+     this.viz.graph.eachNode(function(elem) {
+         $.each(prop, function(p) { elem.getPos(p).$add(pos); });
+     });
+  },
+  /*
+    Hides levels of the tree until it properly fits in canvas.
+  */  
+  setRightLevelToShow: function(node, canvas, callback) {
+     var level = this.getRightLevelToShow(node, canvas), 
+         fx = this.viz.labels,
+         opt = $.merge({
+           execShow:true,
+           execHide:true,
+           onHide: $.empty,
+           onShow: $.empty
+         }, callback || {});
+     node.eachLevel(0, this.config.levelsToShow, function(n) {
+         var d = n._depth - node._depth;
+         if(d > level) {
+             opt.onHide(n);
+             if(opt.execHide) {
+               n.drawn = false; 
+               n.exist = false;
+               fx.hideLabel(n, false);
+             }
+         } else {
+             opt.onShow(n);
+             if(opt.execShow) {
+               n.exist = true;
+             }
+         }
+     });
+     node.drawn= true;
+  },
+  /*
+    Returns the right level to show for the current tree in order to fit in canvas.
+  */  
+  getRightLevelToShow: function(node, canvas) {
+     var config = this.config;
+     var level = config.levelsToShow;
+     var constrained = config.constrained;
+     if(!constrained) return level;
+     while(!this.treeFitsInCanvas(node, canvas, level) && level > 1) { level-- ; }
+     return level;
+  }
+});
+
+/*
+ * File: Loader.js
+ * 
+ */
+
+/*
+   Object: Loader
+
+   Provides methods for loading and serving JSON data.
+*/
+var Loader = {
+     construct: function(json) {
+        var isGraph = ($.type(json) == 'array');
+        var ans = new Graph(this.graphOptions, this.config.Node, this.config.Edge, this.config.Label);
+        if(!isGraph) 
+            //make tree
+            (function (ans, json) {
+                ans.addNode(json);
+                if(json.children) {
+                  for(var i=0, ch = json.children; i<ch.length; i++) {
+                    ans.addAdjacence(json, ch[i]);
+                    arguments.callee(ans, ch[i]);
+                  }
+                }
+            })(ans, json);
+        else
+            //make graph
+            (function (ans, json) {
+                var getNode = function(id) {
+                  for(var i=0, l=json.length; i<l; i++) {
+                    if(json[i].id == id) {
+                      return json[i];
+                    }
+                  }
+                  // The node was not defined in the JSON
+                  // Let's create it
+                  var newNode = {
+                		"id" : id,
+                		"name" : id
+                	};
+                  return ans.addNode(newNode);
+                };
+
+                for(var i=0, l=json.length; i<l; i++) {
+                  ans.addNode(json[i]);
+                  var adj = json[i].adjacencies;
+                  if (adj) {
+                    for(var j=0, lj=adj.length; j<lj; j++) {
+                      var node = adj[j], data = {};
+                      if(typeof adj[j] != 'string') {
+                        data = $.merge(node.data, {});
+                        node = node.nodeTo;
+                      }
+                      ans.addAdjacence(json[i], getNode(node), data);
+                    }
+                  }
+                }
+            })(ans, json);
+
+        return ans;
+    },
+
+    /*
+     Method: loadJSON
+    
+     Loads a JSON structure to the visualization. The JSON structure can be a JSON *tree* or *graph* structure.
+     
+      A JSON tree or graph structure consists of nodes, each having as properties
+       
+       id - (string) A unique identifier for the node
+       name - (string) A node's name
+       data - (object) The data optional property contains a hash (i.e {}) 
+       where you can store all the information you want about this node.
+        
+      For JSON *Tree* structures, there's an extra optional property *children* of type Array which contains the node's children.
+      
+      Example:
+
+      (start code js)
+        var json = {  
+          "id": "aUniqueIdentifier",  
+          "name": "usually a nodes name",  
+          "data": {
+            "some key": "some value",
+            "some other key": "some other value"
+           },  
+          "children": [ *other nodes or empty* ]  
+        };  
+      (end code)
+        
+        JSON *Graph* structures consist of an array of nodes, each specifying the nodes to which the current node is connected. 
+        For JSON *Graph* structures, the *children* property is replaced by the *adjacencies* property.
+        
+        There are two types of *Graph* structures, *simple* and *extended* graph structures.
+        
+        For *simple* Graph structures, the adjacencies property contains an array of strings, each specifying the 
+        id of the node connected to the main node.
+        
+        Example:
+        
+        (start code js)
+        var json = [  
+          {  
+            "id": "aUniqueIdentifier",  
+            "name": "usually a nodes name",  
+            "data": {
+              "some key": "some value",
+              "some other key": "some other value"
+             },  
+            "adjacencies": ["anotherUniqueIdentifier", "yetAnotherUniqueIdentifier", 'etc']  
+          },
+
+          'other nodes go here...' 
+        ];          
+        (end code)
+        
+        For *extended Graph structures*, the adjacencies property contains an array of Adjacency objects that have as properties
+        
+        nodeTo - (string) The other node connected by this adjacency.
+        data - (object) A data property, where we can store custom key/value information.
+        
+        Example:
+        
+        (start code js)
+        var json = [  
+          {  
+            "id": "aUniqueIdentifier",  
+            "name": "usually a nodes name",  
+            "data": {
+              "some key": "some value",
+              "some other key": "some other value"
+             },  
+            "adjacencies": [  
+            {  
+              nodeTo:"aNodeId",  
+              data: {} //put whatever you want here  
+            },
+            'other adjacencies go here...'  
+          },
+
+          'other nodes go here...' 
+        ];          
+        (end code)
+       
+       About the data property:
+       
+       As described before, you can store custom data in the *data* property of JSON *nodes* and *adjacencies*. 
+       You can use almost any string as key for the data object. Some keys though are reserved by the toolkit, and 
+       have special meanings. This is the case for keys starting with a dollar sign, for example, *$width*.
+       
+       For JSON *node* objects, adding dollar prefixed properties that match the names of the options defined in 
+       <Options.Node> will override the general value for that option with that particular value. For this to work 
+       however, you do have to set *overridable = true* in <Options.Node>.
+       
+       The same thing is true for JSON adjacencies. Dollar prefixed data properties will alter values set in <Options.Edge> 
+       if <Options.Edge> has *overridable = true*.
+       
+       When loading JSON data into TreeMaps, the *data* property must contain a value for the *$area* key, 
+       since this is the value which will be taken into account when creating the layout. 
+       The same thing goes for the *$color* parameter.
+       
+       In JSON Nodes you can use also *$label-* prefixed properties to refer to <Options.Label> properties. For example, 
+       *$label-size* will refer to <Options.Label> size property. Also, in JSON nodes and adjacencies you can set 
+       canvas specific properties individually by using the *$canvas-* prefix. For example, *$canvas-shadowBlur* will refer 
+       to the *shadowBlur* property.
+       
+       These properties can also be accessed after loading the JSON data from <Graph.Nodes> and <Graph.Adjacences> 
+       by using <Accessors>. For more information take a look at the <Graph> and <Accessors> documentation.
+       
+       Finally, these properties can also be used to create advanced animations like with <Options.NodeStyles>. For more 
+       information about creating animations please take a look at the <Graph.Plot> and <Graph.Plot.animate> documentation.
+       
+       loadJSON Parameters:
+    
+        json - A JSON Tree or Graph structure.
+        i - For Graph structures only. Sets the indexed node as root for the visualization.
+
+    */
+    loadJSON: function(json, i) {
+      this.json = json;
+      //if they're canvas labels erase them.
+      if(this.labels && this.labels.clearLabels) {
+        this.labels.clearLabels(true);
+      }
+      this.graph = this.construct(json);
+      if($.type(json) != 'array'){
+        this.root = json.id;
+      } else {
+        this.root = json[i? i : 0].id;
+      }
+    },
+    
+    /*
+      Method: toJSON
+   
+      Returns a JSON tree/graph structure from the visualization's <Graph>. 
+      See <Loader.loadJSON> for the graph formats available.
+      
+      See also:
+      
+      <Loader.loadJSON>
+      
+      Parameters:
+      
+      type - (string) Default's "tree". The type of the JSON structure to be returned. 
+      Possible options are "tree" or "graph".
+    */    
+    toJSON: function(type) {
+      type = type || "tree";
+      if(type == 'tree') {
+        var ans = {};
+        var rootNode = this.graph.getNode(this.root);
+        var ans = (function recTree(node) {
+          var ans = {};
+          ans.id = node.id;
+          ans.name = node.name;
+          ans.data = node.data;
+          var ch =[];
+          node.eachSubnode(function(n) {
+            ch.push(recTree(n));
+          });
+          ans.children = ch;
+          return ans;
+        })(rootNode);
+        return ans;
+      } else {
+        var ans = [];
+        var T = !!this.graph.getNode(this.root).visited;
+        this.graph.eachNode(function(node) {
+          var ansNode = {};
+          ansNode.id = node.id;
+          ansNode.name = node.name;
+          ansNode.data = node.data;
+          var adjs = [];
+          node.eachAdjacency(function(adj) {
+            var nodeTo = adj.nodeTo;
+            if(!!nodeTo.visited === T) {
+              var ansAdj = {};
+              ansAdj.nodeTo = nodeTo.id;
+              ansAdj.data = adj.data;
+              adjs.push(ansAdj);
+            }
+          });
+          ansNode.adjacencies = adjs;
+          ans.push(ansNode);
+          node.visited = !T;
+        });
+        return ans;
+      }
+    }
+};
+
+
+
+/*
+ * File: Layouts.js
+ * 
+ * Implements base Tree and Graph layouts.
+ *
+ * Description:
+ *
+ * Implements base Tree and Graph layouts like Radial, Tree, etc.
+ * 
+ */
+
+/*
+ * Object: Layouts
+ * 
+ * Parent object for common layouts.
+ *
+ */
+var Layouts = $jit.Layouts = {};
+
+
+//Some util shared layout functions are defined here.
+var NodeDim = {
+  label: null,
+  
+  compute: function(graph, prop, opt) {
+    this.initializeLabel(opt);
+    var label = this.label, style = label.style;
+    graph.eachNode(function(n) {
+      var autoWidth  = n.getData('autoWidth'),
+          autoHeight = n.getData('autoHeight');
+      if(autoWidth || autoHeight) {
+        //delete dimensions since these are
+        //going to be overridden now.
+        delete n.data.$width;
+        delete n.data.$height;
+        delete n.data.$dim;
+        
+        var width  = n.getData('width'),
+            height = n.getData('height');
+        //reset label dimensions
+        style.width  = autoWidth? 'auto' : width + 'px';
+        style.height = autoHeight? 'auto' : height + 'px';
+        
+        //TODO(nico) should let the user choose what to insert here.
+        label.innerHTML = n.name;
+        
+        var offsetWidth  = label.offsetWidth,
+            offsetHeight = label.offsetHeight;
+        var type = n.getData('type');
+        if($.indexOf(['circle', 'square', 'triangle', 'star'], type) === -1) {
+          n.setData('width', offsetWidth);
+          n.setData('height', offsetHeight);
+        } else {
+          var dim = offsetWidth > offsetHeight? offsetWidth : offsetHeight;
+          n.setData('width', dim);
+          n.setData('height', dim);
+          n.setData('dim', dim); 
+        }
+      }
+    });
+  },
+  
+  initializeLabel: function(opt) {
+    if(!this.label) {
+      this.label = document.createElement('div');
+      document.body.appendChild(this.label);
+    }
+    this.setLabelStyles(opt);
+  },
+  
+  setLabelStyles: function(opt) {
+    $.extend(this.label.style, {
+      'visibility': 'hidden',
+      'position': 'absolute',
+      'width': 'auto',
+      'height': 'auto'
+    });
+    this.label.className = 'jit-autoadjust-label';
+  }
+};
+
+
+/*
+ * Class: Layouts.Tree
+ * 
+ * Implements a Tree Layout.
+ * 
+ * Implemented By:
+ * 
+ * <ST>
+ * 
+ * Inspired by:
+ * 
+ * Drawing Trees (Andrew J. Kennedy) <http://research.microsoft.com/en-us/um/people/akenn/fun/drawingtrees.pdf>
+ * 
+ */
+Layouts.Tree = (function() {
+  //Layout functions
+  var slice = Array.prototype.slice;
+
+  /*
+     Calculates the max width and height nodes for a tree level
+  */  
+  function getBoundaries(graph, config, level, orn, prop) {
+    var dim = config.Node;
+    var multitree = config.multitree;
+    if (dim.overridable) {
+      var w = -1, h = -1;
+      graph.eachNode(function(n) {
+        if (n._depth == level
+            && (!multitree || ('$orn' in n.data) && n.data.$orn == orn)) {
+          var dw = n.getData('width', prop);
+          var dh = n.getData('height', prop);
+          w = (w < dw) ? dw : w;
+          h = (h < dh) ? dh : h;
+        }
+      });
+      return {
+        'width' : w < 0 ? dim.width : w,
+        'height' : h < 0 ? dim.height : h
+      };
+    } else {
+      return dim;
+    }
+  }
+
+
+  function movetree(node, prop, val, orn) {
+    var p = (orn == "left" || orn == "right") ? "y" : "x";
+    node.getPos(prop)[p] += val;
+  }
+
+
+  function moveextent(extent, val) {
+    var ans = [];
+    $.each(extent, function(elem) {
+      elem = slice.call(elem);
+      elem[0] += val;
+      elem[1] += val;
+      ans.push(elem);
+    });
+    return ans;
+  }
+
+
+  function merge(ps, qs) {
+    if (ps.length == 0)
+      return qs;
+    if (qs.length == 0)
+      return ps;
+    var p = ps.shift(), q = qs.shift();
+    return [ [ p[0], q[1] ] ].concat(merge(ps, qs));
+  }
+
+
+  function mergelist(ls, def) {
+    def = def || [];
+    if (ls.length == 0)
+      return def;
+    var ps = ls.pop();
+    return mergelist(ls, merge(ps, def));
+  }
+
+
+  function fit(ext1, ext2, subtreeOffset, siblingOffset, i) {
+    if (ext1.length <= i || ext2.length <= i)
+      return 0;
+
+    var p = ext1[i][1], q = ext2[i][0];
+    return Math.max(fit(ext1, ext2, subtreeOffset, siblingOffset, ++i)
+        + subtreeOffset, p - q + siblingOffset);
+  }
+
+
+  function fitlistl(es, subtreeOffset, siblingOffset) {
+    function $fitlistl(acc, es, i) {
+      if (es.length <= i)
+        return [];
+      var e = es[i], ans = fit(acc, e, subtreeOffset, siblingOffset, 0);
+      return [ ans ].concat($fitlistl(merge(acc, moveextent(e, ans)), es, ++i));
+    }
+    ;
+    return $fitlistl( [], es, 0);
+  }
+
+
+  function fitlistr(es, subtreeOffset, siblingOffset) {
+    function $fitlistr(acc, es, i) {
+      if (es.length <= i)
+        return [];
+      var e = es[i], ans = -fit(e, acc, subtreeOffset, siblingOffset, 0);
+      return [ ans ].concat($fitlistr(merge(moveextent(e, ans), acc), es, ++i));
+    }
+    ;
+    es = slice.call(es);
+    var ans = $fitlistr( [], es.reverse(), 0);
+    return ans.reverse();
+  }
+
+
+  function fitlist(es, subtreeOffset, siblingOffset, align) {
+    var esl = fitlistl(es, subtreeOffset, siblingOffset), esr = fitlistr(es,
+        subtreeOffset, siblingOffset);
+
+    if (align == "left")
+      esr = esl;
+    else if (align == "right")
+      esl = esr;
+
+    for ( var i = 0, ans = []; i < esl.length; i++) {
+      ans[i] = (esl[i] + esr[i]) / 2;
+    }
+    return ans;
+  }
+
+
+  function design(graph, node, prop, config, orn) {
+    var multitree = config.multitree;
+    var auxp = [ 'x', 'y' ], auxs = [ 'width', 'height' ];
+    var ind = +(orn == "left" || orn == "right");
+    var p = auxp[ind], notp = auxp[1 - ind];
+
+    var cnode = config.Node;
+    var s = auxs[ind], nots = auxs[1 - ind];
+
+    var siblingOffset = config.siblingOffset;
+    var subtreeOffset = config.subtreeOffset;
+    var align = config.align;
+
+    function $design(node, maxsize, acum) {
+      var sval = node.getData(s, prop);
+      var notsval = maxsize
+          || (node.getData(nots, prop));
+
+      var trees = [], extents = [], chmaxsize = false;
+      var chacum = notsval + config.levelDistance;
+      node.eachSubnode(function(n) {
+            if (n.exist
+                && (!multitree || ('$orn' in n.data) && n.data.$orn == orn)) {
+
+              if (!chmaxsize)
+                chmaxsize = getBoundaries(graph, config, n._depth, orn, prop);
+
+              var s = $design(n, chmaxsize[nots], acum + chacum);
+              trees.push(s.tree);
+              extents.push(s.extent);
+            }
+          });
+      var positions = fitlist(extents, subtreeOffset, siblingOffset, align);
+      for ( var i = 0, ptrees = [], pextents = []; i < trees.length; i++) {
+        movetree(trees[i], prop, positions[i], orn);
+        pextents.push(moveextent(extents[i], positions[i]));
+      }
+      var resultextent = [ [ -sval / 2, sval / 2 ] ]
+          .concat(mergelist(pextents));
+      node.getPos(prop)[p] = 0;
+
+      if (orn == "top" || orn == "left") {
+        node.getPos(prop)[notp] = acum;
+      } else {
+        node.getPos(prop)[notp] = -acum;
+      }
+
+      return {
+        tree : node,
+        extent : resultextent
+      };
+    }
+
+    $design(node, false, 0);
+  }
+
+
+  return new Class({
+    /*
+    Method: compute
+    
+    Computes nodes' positions.
+
+     */
+    compute : function(property, computeLevels) {
+      var prop = property || 'start';
+      var node = this.graph.getNode(this.root);
+      $.extend(node, {
+        'drawn' : true,
+        'exist' : true,
+        'selected' : true
+      });
+      NodeDim.compute(this.graph, prop, this.config);
+      if (!!computeLevels || !("_depth" in node)) {
+        this.graph.computeLevels(this.root, 0, "ignore");
+      }
+      
+      this.computePositions(node, prop);
+    },
+
+    computePositions : function(node, prop) {
+      var config = this.config;
+      var multitree = config.multitree;
+      var align = config.align;
+      var indent = align !== 'center' && config.indent;
+      var orn = config.orientation;
+      var orns = multitree ? [ 'top', 'right', 'bottom', 'left' ] : [ orn ];
+      var that = this;
+      $.each(orns, function(orn) {
+        //calculate layout
+          design(that.graph, node, prop, that.config, orn, prop);
+          var i = [ 'x', 'y' ][+(orn == "left" || orn == "right")];
+          //absolutize
+          (function red(node) {
+            node.eachSubnode(function(n) {
+              if (n.exist
+                  && (!multitree || ('$orn' in n.data) && n.data.$orn == orn)) {
+
+                n.getPos(prop)[i] += node.getPos(prop)[i];
+                if (indent) {
+                  n.getPos(prop)[i] += align == 'left' ? indent : -indent;
+                }
+                red(n);
+              }
+            });
+          })(node);
+        });
+    }
+  });
+  
+})();
+
+/*
+ * File: Spacetree.js
+ */
+
+/*
+   Class: ST
+   
+  A Tree layout with advanced contraction and expansion animations.
+     
+  Inspired by:
+ 
+  SpaceTree: Supporting Exploration in Large Node Link Tree, Design Evolution and Empirical Evaluation (Catherine Plaisant, Jesse Grosjean, Benjamin B. Bederson) 
+  <http://hcil.cs.umd.edu/trs/2002-05/2002-05.pdf>
+  
+  Drawing Trees (Andrew J. Kennedy) <http://research.microsoft.com/en-us/um/people/akenn/fun/drawingtrees.pdf>
+  
+  Note:
+ 
+  This visualization was built and engineered from scratch, taking only the papers as inspiration, and only shares some features with the visualization described in those papers.
+ 
+  Implements:
+  
+  All <Loader> methods
+  
+  Constructor Options:
+  
+  Inherits options from
+  
+  - <Options.Canvas>
+  - <Options.Controller>
+  - <Options.Tree>
+  - <Options.Node>
+  - <Options.Edge>
+  - <Options.Label>
+  - <Options.Events>
+  - <Options.Tips>
+  - <Options.NodeStyles>
+  - <Options.Navigation>
+  
+  Additionally, there are other parameters and some default values changed
+  
+  constrained - (boolean) Default's *true*. Whether to show the entire tree when loaded or just the number of levels specified by _levelsToShow_.
+  levelsToShow - (number) Default's *2*. The number of levels to show for a subtree. This number is relative to the selected node.
+  levelDistance - (number) Default's *30*. The distance between two consecutive levels of the tree.
+  Node.type - Described in <Options.Node>. Default's set to *rectangle*.
+  offsetX - (number) Default's *0*. The x-offset distance from the selected node to the center of the canvas.
+  offsetY - (number) Default's *0*. The y-offset distance from the selected node to the center of the canvas.
+  duration - Described in <Options.Fx>. It's default value has been changed to *700*.
+  
+  Instance Properties:
+  
+  canvas - Access a <Canvas> instance.
+  graph - Access a <Graph> instance.
+  op - Access a <ST.Op> instance.
+  fx - Access a <ST.Plot> instance.
+  labels - Access a <ST.Label> interface implementation.
+
+ */
+
+$jit.ST= (function() {
+    // Define some private methods first...
+    // Nodes in path
+    var nodesInPath = [];
+    // Nodes to contract
+    function getNodesToHide(node) {
+      node = node || this.clickedNode;
+      if(!this.config.constrained) {
+        return [];
+      }
+      var Geom = this.geom;
+      var graph = this.graph;
+      var canvas = this.canvas;
+      var level = node._depth, nodeArray = [];
+  	  graph.eachNode(function(n) {
+          if(n.exist && !n.selected) {
+              if(n.isDescendantOf(node.id)) {
+                if(n._depth <= level) nodeArray.push(n);
+              } else {
+                nodeArray.push(n);
+              }
+          }
+  	  });
+  	  var leafLevel = Geom.getRightLevelToShow(node, canvas);
+  	  node.eachLevel(leafLevel, leafLevel, function(n) {
+          if(n.exist && !n.selected) nodeArray.push(n);
+  	  });
+  	    
+  	  for (var i = 0; i < nodesInPath.length; i++) {
+  	    var n = this.graph.getNode(nodesInPath[i]);
+  	    if(!n.isDescendantOf(node.id)) {
+  	      nodeArray.push(n);
+  	    }
+  	  } 
+  	  return nodeArray;       
+    };
+    // Nodes to expand
+     function getNodesToShow(node) {
+        var nodeArray = [], config = this.config;
+        node = node || this.clickedNode;
+        this.clickedNode.eachLevel(0, config.levelsToShow, function(n) {
+            if(config.multitree && !('$orn' in n.data) 
+            		&& n.anySubnode(function(ch){ return ch.exist && !ch.drawn; })) {
+            	nodeArray.push(n);
+            } else if(n.drawn && !n.anySubnode("drawn")) {
+              nodeArray.push(n);
+            }
+        });
+        return nodeArray;
+     };
+    // Now define the actual class.
+    return new Class({
+    
+        Implements: [Loader, Extras, Layouts.Tree],
+        
+        initialize: function(controller) {            
+          var $ST = $jit.ST;
+          
+          var config= {
+                levelsToShow: 2,
+                levelDistance: 30,
+                constrained: true,                
+                Node: {
+                  type: 'rectangle'
+                },
+                duration: 700,
+                offsetX: 0,
+                offsetY: 0
+            };
+            
+            this.controller = this.config = $.merge(
+                Options("Canvas", "Fx", "Tree", "Node", "Edge", "Controller", 
+                    "Tips", "NodeStyles", "Events", "Navigation", "Label"), config, controller);
+
+            var canvasConfig = this.config;
+            if(canvasConfig.useCanvas) {
+              this.canvas = canvasConfig.useCanvas;
+              this.config.labelContainer = this.canvas.id + '-label';
+            } else {
+              if(canvasConfig.background) {
+                canvasConfig.background = $.merge({
+                  type: 'Circles'
+                }, canvasConfig.background);
+              }
+              this.canvas = new Canvas(this, canvasConfig);
+              this.config.labelContainer = (typeof canvasConfig.injectInto == 'string'? canvasConfig.injectInto : canvasConfig.injectInto.id) + '-label';
+            }
+
+            this.graphOptions = {
+                'complex': true
+            };
+            this.graph = new Graph(this.graphOptions, this.config.Node, this.config.Edge);
+            this.labels = new $ST.Label[canvasConfig.Label.type](this);
+            this.fx = new $ST.Plot(this, $ST);
+            this.op = new $ST.Op(this);
+            this.group = new $ST.Group(this);
+            this.geom = new $ST.Geom(this);
+            this.clickedNode=  null;
+            // initialize extras
+            this.initializeExtras();
+        },
+    
+        /*
+         Method: plot
+        
+         Plots the <ST>. This is a shortcut to *fx.plot*.
+
+        */  
+        plot: function() { this.fx.plot(this.controller); },
+    
+      
+        /*
+         Method: switchPosition
+        
+         Switches the tree orientation.
+
+         Parameters:
+
+        pos - (string) The new tree orientation. Possible values are "top", "left", "right" and "bottom".
+        method - (string) Set this to "animate" if you want to animate the tree when switching its position. You can also set this parameter to "replot" to just replot the subtree.
+        onComplete - (optional|object) This callback is called once the "switching" animation is complete.
+
+         Example:
+
+         (start code js)
+           st.switchPosition("right", "animate", {
+            onComplete: function() {
+              alert('completed!');
+            } 
+           });
+         (end code)
+        */  
+        switchPosition: function(pos, method, onComplete) {
+          var Geom = this.geom, Plot = this.fx, that = this;
+          if(!Plot.busy) {
+              Plot.busy = true;
+              this.contract({
+                  onComplete: function() {
+                      Geom.switchOrientation(pos);
+                      that.compute('end', false);
+                      Plot.busy = false;
+                      if(method == 'animate') {
+                    	  that.onClick(that.clickedNode.id, onComplete);  
+                      } else if(method == 'replot') {
+                    	  that.select(that.clickedNode.id, onComplete);
+                      }
+                  }
+              }, pos);
+          }
+        },
+
+        /*
+        Method: switchAlignment
+       
+        Switches the tree alignment.
+
+        Parameters:
+
+       align - (string) The new tree alignment. Possible values are "left", "center" and "right".
+       method - (string) Set this to "animate" if you want to animate the tree after aligning its position. You can also set this parameter to "replot" to just replot the subtree.
+       onComplete - (optional|object) This callback is called once the "switching" animation is complete.
+
+        Example:
+
+        (start code js)
+          st.switchAlignment("right", "animate", {
+           onComplete: function() {
+             alert('completed!');
+           } 
+          });
+        (end code)
+       */  
+       switchAlignment: function(align, method, onComplete) {
+        this.config.align = align;
+        if(method == 'animate') {
+        	this.select(this.clickedNode.id, onComplete);
+        } else if(method == 'replot') {
+        	this.onClick(this.clickedNode.id, onComplete);	
+        }
+       },
+
+       /*
+        Method: addNodeInPath
+       
+        Adds a node to the current path as selected node. The selected node will be visible (as in non-collapsed) at all times.
+        
+
+        Parameters:
+
+       id - (string) A <Graph.Node> id.
+
+        Example:
+
+        (start code js)
+          st.addNodeInPath("nodeId");
+        (end code)
+       */  
+       addNodeInPath: function(id) {
+           nodesInPath.push(id);
+           this.select((this.clickedNode && this.clickedNode.id) || this.root);
+       },       
+
+       /*
+       Method: clearNodesInPath
+      
+       Removes all nodes tagged as selected by the <ST.addNodeInPath> method.
+       
+       See also:
+       
+       <ST.addNodeInPath>
+     
+       Example:
+
+       (start code js)
+         st.clearNodesInPath();
+       (end code)
+      */  
+       clearNodesInPath: function(id) {
+           nodesInPath.length = 0;
+           this.select((this.clickedNode && this.clickedNode.id) || this.root);
+       },
+        
+       /*
+         Method: refresh
+        
+         Computes positions and plots the tree.
+         
+       */
+       refresh: function() {
+           this.reposition();
+           this.select((this.clickedNode && this.clickedNode.id) || this.root);
+       },    
+
+       reposition: function() {
+            this.graph.computeLevels(this.root, 0, "ignore");
+             this.geom.setRightLevelToShow(this.clickedNode, this.canvas);
+            this.graph.eachNode(function(n) {
+                if(n.exist) n.drawn = true;
+            });
+            this.compute('end');
+        },
+        
+        requestNodes: function(node, onComplete) {
+          var handler = $.merge(this.controller, onComplete), 
+          lev = this.config.levelsToShow;
+          if(handler.request) {
+              var leaves = [], d = node._depth;
+              node.eachLevel(0, lev, function(n) {
+                  if(n.drawn && 
+                   !n.anySubnode()) {
+                   leaves.push(n);
+                   n._level = lev - (n._depth - d);
+                  }
+              });
+              this.group.requestNodes(leaves, handler);
+          }
+            else
+              handler.onComplete();
+        },
+     
+        contract: function(onComplete, switched) {
+          var orn  = this.config.orientation;
+          var Geom = this.geom, Group = this.group;
+          if(switched) Geom.switchOrientation(switched);
+          var nodes = getNodesToHide.call(this);
+          if(switched) Geom.switchOrientation(orn);
+          Group.contract(nodes, $.merge(this.controller, onComplete));
+        },
+      
+         move: function(node, onComplete) {
+            this.compute('end', false);
+            var move = onComplete.Move, offset = {
+                'x': move.offsetX,
+                'y': move.offsetY 
+            };
+            if(move.enable) {
+                this.geom.translate(node.endPos.add(offset).$scale(-1), "end");
+            }
+            this.fx.animate($.merge(this.controller, { modes: ['linear'] }, onComplete));
+         },
+      
+        expand: function (node, onComplete) {
+            var nodeArray = getNodesToShow.call(this, node);
+            this.group.expand(nodeArray, $.merge(this.controller, onComplete));
+        },
+    
+        selectPath: function(node) {
+          var that = this;
+          this.graph.eachNode(function(n) { n.selected = false; }); 
+          function path(node) {
+              if(node == null || node.selected) return;
+              node.selected = true;
+              $.each(that.group.getSiblings([node])[node.id], 
+              function(n) { 
+                   n.exist = true; 
+                   n.drawn = true; 
+              });    
+              var parents = node.getParents();
+              parents = (parents.length > 0)? parents[0] : null;
+              path(parents);
+          };
+          for(var i=0, ns = [node.id].concat(nodesInPath); i < ns.length; i++) {
+              path(this.graph.getNode(ns[i]));
+          }
+        },
+      
+        /*
+        Method: setRoot
+     
+         Switches the current root node. Changes the topology of the Tree.
+     
+        Parameters:
+           id - (string) The id of the node to be set as root.
+           method - (string) Set this to "animate" if you want to animate the tree after adding the subtree. You can also set this parameter to "replot" to just replot the subtree.
+           onComplete - (optional|object) An action to perform after the animation (if any).
+ 
+        Example:
+
+        (start code js)
+          st.setRoot('nodeId', 'animate', {
+             onComplete: function() {
+               alert('complete!');
+             }
+          });
+        (end code)
+     */
+     setRoot: function(id, method, onComplete) {
+        	if(this.busy) return;
+        	this.busy = true;
+          var that = this, canvas = this.canvas;
+        	var rootNode = this.graph.getNode(this.root);
+        	var clickedNode = this.graph.getNode(id);
+        	function $setRoot() {
+            	if(this.config.multitree && clickedNode.data.$orn) {
+            		var orn = clickedNode.data.$orn;
+            		var opp = {
+            				'left': 'right',
+            				'right': 'left',
+            				'top': 'bottom',
+            				'bottom': 'top'
+            		}[orn];
+            		rootNode.data.$orn = opp;
+            		(function tag(rootNode) {
+                		rootNode.eachSubnode(function(n) {
+                			if(n.id != id) {
+                				n.data.$orn = opp;
+                				tag(n);
+                			}
+                		});
+            		})(rootNode);
+            		delete clickedNode.data.$orn;
+            	}
+            	this.root = id;
+            	this.clickedNode = clickedNode;
+            	this.graph.computeLevels(this.root, 0, "ignore");
+            	this.geom.setRightLevelToShow(clickedNode, canvas, {
+            	  execHide: false,
+            	  onShow: function(node) {
+            	    if(!node.drawn) {
+                    node.drawn = true;
+                    node.setData('alpha', 1, 'end');
+                    node.setData('alpha', 0);
+                    node.pos.setc(clickedNode.pos.x, clickedNode.pos.y);
+            	    }
+            	  }
+            	});
+              this.compute('end');
+              this.busy = true;
+              this.fx.animate({
+                modes: ['linear', 'node-property:alpha'],
+                onComplete: function() {
+                  that.busy = false;
+                  that.onClick(id, {
+                    onComplete: function() {
+                      onComplete && onComplete.onComplete();
+                    }
+                  });
+                }
+              });
+        	}
+
+        	// delete previous orientations (if any)
+        	delete rootNode.data.$orns;
+
+        	if(method == 'animate') {
+        	  $setRoot.call(this);
+        	  that.selectPath(clickedNode);
+        	} else if(method == 'replot') {
+        		$setRoot.call(this);
+        		this.select(this.root);
+        	}
+     },
+
+     /*
+           Method: addSubtree
+        
+            Adds a subtree.
+        
+           Parameters:
+              subtree - (object) A JSON Tree object. See also <Loader.loadJSON>.
+              method - (string) Set this to "animate" if you want to animate the tree after adding the subtree. You can also set this parameter to "replot" to just replot the subtree.
+              onComplete - (optional|object) An action to perform after the animation (if any).
+    
+           Example:
+
+           (start code js)
+             st.addSubtree(json, 'animate', {
+                onComplete: function() {
+                  alert('complete!');
+                }
+             });
+           (end code)
+        */
+        addSubtree: function(subtree, method, onComplete) {
+            if(method == 'replot') {
+                this.op.sum(subtree, $.extend({ type: 'replot' }, onComplete || {}));
+            } else if (method == 'animate') {
+                this.op.sum(subtree, $.extend({ type: 'fade:seq' }, onComplete || {}));
+            }
+        },
+    
+        /*
+           Method: removeSubtree
+        
+            Removes a subtree.
+        
+           Parameters:
+              id - (string) The _id_ of the subtree to be removed.
+              removeRoot - (boolean) Default's *false*. Remove the root of the subtree or only its subnodes.
+              method - (string) Set this to "animate" if you want to animate the tree after removing the subtree. You can also set this parameter to "replot" to just replot the subtree.
+              onComplete - (optional|object) An action to perform after the animation (if any).
+
+          Example:
+
+          (start code js)
+            st.removeSubtree('idOfSubtreeToBeRemoved', false, 'animate', {
+              onComplete: function() {
+                alert('complete!');
+              }
+            });
+          (end code)
+    
+        */
+        removeSubtree: function(id, removeRoot, method, onComplete) {
+            var node = this.graph.getNode(id), subids = [];
+            node.eachLevel(+!removeRoot, false, function(n) {
+                subids.push(n.id);
+            });
+            if(method == 'replot') {
+                this.op.removeNode(subids, $.extend({ type: 'replot' }, onComplete || {}));
+            } else if (method == 'animate') {
+                this.op.removeNode(subids, $.extend({ type: 'fade:seq'}, onComplete || {}));
+            }
+        },
+    
+        /*
+           Method: select
+        
+            Selects a node in the <ST> without performing an animation. Useful when selecting 
+            nodes which are currently hidden or deep inside the tree.
+
+          Parameters:
+            id - (string) The id of the node to select.
+            onComplete - (optional|object) an onComplete callback.
+
+          Example:
+          (start code js)
+            st.select('mynodeid', {
+              onComplete: function() {
+                alert('complete!');
+              }
+            });
+          (end code)
+        */
+        select: function(id, onComplete) {
+            var group = this.group, geom = this.geom;
+            var node=  this.graph.getNode(id), canvas = this.canvas;
+            var root  = this.graph.getNode(this.root);
+            var complete = $.merge(this.controller, onComplete);
+            var that = this;
+    
+            complete.onBeforeCompute(node);
+            this.selectPath(node);
+            this.clickedNode= node;
+            this.requestNodes(node, {
+                onComplete: function(){
+                    group.hide(group.prepare(getNodesToHide.call(that)), complete);
+                    geom.setRightLevelToShow(node, canvas);
+                    that.compute("current");
+                    that.graph.eachNode(function(n) { 
+                        var pos = n.pos.getc(true);
+                        n.startPos.setc(pos.x, pos.y);
+                        n.endPos.setc(pos.x, pos.y);
+                        n.visited = false; 
+                    });
+                    var offset = { x: complete.offsetX, y: complete.offsetY };
+                    that.geom.translate(node.endPos.add(offset).$scale(-1), ["start", "current", "end"]);
+                    group.show(getNodesToShow.call(that));              
+                    that.plot();
+                    complete.onAfterCompute(that.clickedNode);
+                    complete.onComplete();
+                }
+            });     
+        },
+    
+      /*
+         Method: onClick
+    
+        Animates the <ST> to center the node specified by *id*.
+            
+        Parameters:
+        
+        id - (string) A node id.
+        options - (optional|object) A group of options and callbacks described below.
+        onComplete - (object) An object callback called when the animation finishes.
+        Move - (object) An object that has as properties _offsetX_ or _offsetY_ for adding some offset position to the centered node.
+
+        Example:
+
+        (start code js)
+          st.onClick('mynodeid', {
+	          Move: {
+	          	enable: true,
+	            offsetX: 30,
+	            offsetY: 5
+	          },
+	          onComplete: function() {
+	              alert('yay!');
+	          }
+          });
+        (end code)
+    
+        */    
+      onClick: function (id, options) {
+        var canvas = this.canvas, that = this, Geom = this.geom, config = this.config;
+        var innerController = {
+            Move: {
+        	    enable: true,
+              offsetX: config.offsetX || 0,
+              offsetY: config.offsetY || 0  
+            },
+            setRightLevelToShowConfig: false,
+            onBeforeRequest: $.empty,
+            onBeforeContract: $.empty,
+            onBeforeMove: $.empty,
+            onBeforeExpand: $.empty
+        };
+        var complete = $.merge(this.controller, innerController, options);
+        
+        if(!this.busy) {
+            this.busy = true;
+            var node = this.graph.getNode(id);
+            this.selectPath(node, this.clickedNode);
+           	this.clickedNode = node;
+            complete.onBeforeCompute(node);
+            complete.onBeforeRequest(node);
+            this.requestNodes(node, {
+                onComplete: function() {
+                    complete.onBeforeContract(node);
+                    that.contract({
+                        onComplete: function() {
+                            Geom.setRightLevelToShow(node, canvas, complete.setRightLevelToShowConfig);
+                            complete.onBeforeMove(node);
+                            that.move(node, {
+                                Move: complete.Move,
+                                onComplete: function() {
+                                    complete.onBeforeExpand(node);
+                                    that.expand(node, {
+                                        onComplete: function() {
+                                            that.busy = false;
+                                            complete.onAfterCompute(id);
+                                            complete.onComplete();
+                                        }
+                                    }); // expand
+                                }
+                            }); // move
+                        }
+                    });// contract
+                }
+            });// request
+        }
+      }
+    });
+
+})();
+
+$jit.ST.$extend = true;
+
+/*
+   Class: ST.Op
+    
+   Custom extension of <Graph.Op>.
+
+   Extends:
+
+   All <Graph.Op> methods
+   
+   See also:
+   
+   <Graph.Op>
+
+*/
+$jit.ST.Op = new Class({
+
+  Implements: Graph.Op
+    
+});
+
+/*
+    
+     Performs operations on group of nodes.
+
+*/
+$jit.ST.Group = new Class({
+    
+    initialize: function(viz) {
+        this.viz = viz;
+        this.canvas = viz.canvas;
+        this.config = viz.config;
+        this.animation = new Animation;
+        this.nodes = null;
+    },
+    
+    /*
+    
+       Calls the request method on the controller to request a subtree for each node. 
+    */
+    requestNodes: function(nodes, controller) {
+        var counter = 0, len = nodes.length, nodeSelected = {};
+        var complete = function() { controller.onComplete(); };
+        var viz = this.viz;
+        if(len == 0) complete();
+        for(var i=0; i<len; i++) {
+            nodeSelected[nodes[i].id] = nodes[i];
+            controller.request(nodes[i].id, nodes[i]._level, {
+                onComplete: function(nodeId, data) {
+                    if(data && data.children) {
+                        data.id = nodeId;
+                        viz.op.sum(data, { type: 'nothing' });
+                    }
+                    if(++counter == len) {
+                        viz.graph.computeLevels(viz.root, 0);
+                        complete();
+                    }
+                }
+            });
+        }
+    },
+    
+    /*
+    
+       Collapses group of nodes. 
+    */
+    contract: function(nodes, controller) {
+        var viz = this.viz;
+        var that = this;
+
+        nodes = this.prepare(nodes);
+        this.animation.setOptions($.merge(controller, {
+            $animating: false,
+            compute: function(delta) {
+              if(delta == 1) delta = 0.99;
+              that.plotStep(1 - delta, controller, this.$animating);
+              this.$animating = 'contract';
+            },
+            
+            complete: function() {
+                that.hide(nodes, controller);
+            }       
+        })).start();
+    },
+    
+    hide: function(nodes, controller) {
+        var viz = this.viz;
+        for(var i=0; i<nodes.length; i++) {
+            // TODO nodes are requested on demand, but not
+            // deleted when hidden. Would that be a good feature?
+            // Currently that feature is buggy, so I'll turn it off
+            // Actually this feature is buggy because trimming should take
+            // place onAfterCompute and not right after collapsing nodes.
+            if (true || !controller || !controller.request) {
+                nodes[i].eachLevel(1, false, function(elem){
+                    if (elem.exist) {
+                        $.extend(elem, {
+                            'drawn': false,
+                            'exist': false
+                        });
+                    }
+                });
+            } else {
+                var ids = [];
+                nodes[i].eachLevel(1, false, function(n) {
+                    ids.push(n.id);
+                });
+                viz.op.removeNode(ids, { 'type': 'nothing' });
+                viz.labels.clearLabels();
+            }
+        }
+        controller.onComplete();
+    },    
+    
+
+    /*
+       Expands group of nodes. 
+    */
+    expand: function(nodes, controller) {
+        var that = this;
+        this.show(nodes);
+        this.animation.setOptions($.merge(controller, {
+            $animating: false,
+            compute: function(delta) {
+                that.plotStep(delta, controller, this.$animating);
+                this.$animating = 'expand';
+            },
+            
+            complete: function() {
+                that.plotStep(undefined, controller, false);
+                controller.onComplete();
+            }       
+        })).start();
+        
+    },
+    
+    show: function(nodes) {
+        var config = this.config;
+        this.prepare(nodes);
+        $.each(nodes, function(n) {
+        	// check for root nodes if multitree
+        	if(config.multitree && !('$orn' in n.data)) {
+        		delete n.data.$orns;
+        		var orns = ' ';
+        		n.eachSubnode(function(ch) {
+        			if(('$orn' in ch.data) 
+        					&& orns.indexOf(ch.data.$orn) < 0 
+        					&& ch.exist && !ch.drawn) {
+        				orns += ch.data.$orn + ' ';
+        			}
+        		});
+        		n.data.$orns = orns;
+        	}
+            n.eachLevel(0, config.levelsToShow, function(n) {
+            	if(n.exist) n.drawn = true;
+            });     
+        });
+    },
+    
+    prepare: function(nodes) {
+        this.nodes = this.getNodesWithChildren(nodes);
+        return this.nodes;
+    },
+    
+    /*
+       Filters an array of nodes leaving only nodes with children.
+    */
+    getNodesWithChildren: function(nodes) {
+        var ans = [], config = this.config, root = this.viz.root;
+        nodes.sort(function(a, b) { return (a._depth <= b._depth) - (a._depth >= b._depth); });
+        for(var i=0; i<nodes.length; i++) {
+            if(nodes[i].anySubnode("exist")) {
+            	for (var j = i+1, desc = false; !desc && j < nodes.length; j++) {
+                    if(!config.multitree || '$orn' in nodes[j].data) {
+                		desc = desc || nodes[i].isDescendantOf(nodes[j].id);                    	
+                    }
+                }
+                if(!desc) ans.push(nodes[i]);
+            }
+        }
+        return ans;
+    },
+    
+    plotStep: function(delta, controller, animating) {
+        var viz = this.viz,
+        config = this.config,
+        canvas = viz.canvas, 
+        ctx = canvas.getCtx(),
+        nodes = this.nodes;
+        var i, node;
+        // hide nodes that are meant to be collapsed/expanded
+        var nds = {};
+        for(i=0; i<nodes.length; i++) {
+          node = nodes[i];
+          nds[node.id] = [];
+          var root = config.multitree && !('$orn' in node.data);
+          var orns = root && node.data.$orns;
+          node.eachSubgraph(function(n) { 
+            // TODO(nico): Cleanup
+        	  // special check for root node subnodes when
+        	  // multitree is checked.
+        	  if(root && orns && orns.indexOf(n.data.$orn) > 0 
+        			  && n.drawn) {
+        		  n.drawn = false;
+                  nds[node.id].push(n);
+              } else if((!root || !orns) && n.drawn) {
+                n.drawn = false;
+                nds[node.id].push(n);
+              }
+            });	
+            node.drawn = true;
+        }
+        // plot the whole (non-scaled) tree
+        if(nodes.length > 0) viz.fx.plot();
+        // show nodes that were previously hidden
+        for(i in nds) {
+          $.each(nds[i], function(n) { n.drawn = true; });
+        }
+        // plot each scaled subtree
+        for(i=0; i<nodes.length; i++) {
+          node = nodes[i];
+          ctx.save();
+          viz.fx.plotSubtree(node, controller, delta, animating);                
+          ctx.restore();
+        }
+      },
+
+      getSiblings: function(nodes) {
+        var siblings = {};
+        $.each(nodes, function(n) {
+            var par = n.getParents();
+            if (par.length == 0) {
+                siblings[n.id] = [n];
+            } else {
+                var ans = [];
+                par[0].eachSubnode(function(sn) {
+                    ans.push(sn);
+                });
+                siblings[n.id] = ans;
+            }
+        });
+        return siblings;
+    }
+});
+
+/*
+   ST.Geom
+
+   Performs low level geometrical computations.
+
+   Access:
+
+   This instance can be accessed with the _geom_ parameter of the st instance created.
+
+   Example:
+
+   (start code js)
+    var st = new ST(canvas, config);
+    st.geom.translate //or can also call any other <ST.Geom> method
+   (end code)
+
+*/
+
+$jit.ST.Geom = new Class({
+    Implements: Graph.Geom,
+    /*
+       Changes the tree current orientation to the one specified.
+
+       You should usually use <ST.switchPosition> instead.
+    */  
+    switchOrientation: function(orn) {
+    	this.config.orientation = orn;
+    },
+
+    /*
+       Makes a value dispatch according to the current layout
+       Works like a CSS property, either _top-right-bottom-left_ or _top|bottom - left|right_.
+     */
+    dispatch: function() {
+    	  // TODO(nico) should store Array.prototype.slice.call somewhere.
+        var args = Array.prototype.slice.call(arguments);
+        var s = args.shift(), len = args.length;
+        var val = function(a) { return typeof a == 'function'? a() : a; };
+        if(len == 2) {
+            return (s == "top" || s == "bottom")? val(args[0]) : val(args[1]);
+        } else if(len == 4) {
+            switch(s) {
+                case "top": return val(args[0]);
+                case "right": return val(args[1]);
+                case "bottom": return val(args[2]);
+                case "left": return val(args[3]);
+            }
+        }
+        return undefined;
+    },
+
+    /*
+       Returns label height or with, depending on the tree current orientation.
+    */  
+    getSize: function(n, invert) {
+        var data = n.data, config = this.config;
+        var siblingOffset = config.siblingOffset;
+        var s = (config.multitree 
+        		&& ('$orn' in data) 
+        		&& data.$orn) || config.orientation;
+        var w = n.getData('width') + siblingOffset;
+        var h = n.getData('height') + siblingOffset;
+        if(!invert)
+            return this.dispatch(s, h, w);
+        else
+            return this.dispatch(s, w, h);
+    },
+    
+    /*
+       Calculates a subtree base size. This is an utility function used by _getBaseSize_
+    */  
+    getTreeBaseSize: function(node, level, leaf) {
+        var size = this.getSize(node, true), baseHeight = 0, that = this;
+        if(leaf(level, node)) return size;
+        if(level === 0) return 0;
+        node.eachSubnode(function(elem) {
+            baseHeight += that.getTreeBaseSize(elem, level -1, leaf);
+        });
+        return (size > baseHeight? size : baseHeight) + this.config.subtreeOffset;
+    },
+
+
+    /*
+       getEdge
+       
+       Returns a Complex instance with the begin or end position of the edge to be plotted.
+
+       Parameters:
+
+       node - A <Graph.Node> that is connected to this edge.
+       type - Returns the begin or end edge position. Possible values are 'begin' or 'end'.
+
+       Returns:
+
+       A <Complex> number specifying the begin or end position.
+    */  
+    getEdge: function(node, type, s) {
+    	var $C = function(a, b) { 
+          return function(){
+            return node.pos.add(new Complex(a, b));
+          }; 
+        };
+        var dim = this.node;
+        var w = node.getData('width');
+        var h = node.getData('height');
+
+        if(type == 'begin') {
+            if(dim.align == "center") {
+                return this.dispatch(s, $C(0, h/2), $C(-w/2, 0),
+                                     $C(0, -h/2),$C(w/2, 0));
+            } else if(dim.align == "left") {
+                return this.dispatch(s, $C(0, h), $C(0, 0),
+                                     $C(0, 0), $C(w, 0));
+            } else if(dim.align == "right") {
+                return this.dispatch(s, $C(0, 0), $C(-w, 0),
+                                     $C(0, -h),$C(0, 0));
+            } else throw "align: not implemented";
+            
+            
+        } else if(type == 'end') {
+            if(dim.align == "center") {
+                return this.dispatch(s, $C(0, -h/2), $C(w/2, 0),
+                                     $C(0, h/2),  $C(-w/2, 0));
+            } else if(dim.align == "left") {
+                return this.dispatch(s, $C(0, 0), $C(w, 0),
+                                     $C(0, h), $C(0, 0));
+            } else if(dim.align == "right") {
+                return this.dispatch(s, $C(0, -h),$C(0, 0),
+                                     $C(0, 0), $C(-w, 0));
+            } else throw "align: not implemented";
+        }
+    },
+
+    /*
+       Adjusts the tree position due to canvas scaling or translation.
+    */  
+    getScaledTreePosition: function(node, scale) {
+        var dim = this.node;
+        var w = node.getData('width');
+        var h = node.getData('height');
+        var s = (this.config.multitree 
+        		&& ('$orn' in node.data) 
+        		&& node.data.$orn) || this.config.orientation;
+
+        var $C = function(a, b) { 
+          return function(){
+            return node.pos.add(new Complex(a, b)).$scale(1 - scale);
+          }; 
+        };
+        if(dim.align == "left") {
+            return this.dispatch(s, $C(0, h), $C(0, 0),
+                                 $C(0, 0), $C(w, 0));
+        } else if(dim.align == "center") {
+            return this.dispatch(s, $C(0, h / 2), $C(-w / 2, 0),
+                                 $C(0, -h / 2),$C(w / 2, 0));
+        } else if(dim.align == "right") {
+            return this.dispatch(s, $C(0, 0), $C(-w, 0),
+                                 $C(0, -h),$C(0, 0));
+        } else throw "align: not implemented";
+    },
+
+    /*
+       treeFitsInCanvas
+       
+       Returns a Boolean if the current subtree fits in canvas.
+
+       Parameters:
+
+       node - A <Graph.Node> which is the current root of the subtree.
+       canvas - The <Canvas> object.
+       level - The depth of the subtree to be considered.
+    */  
+    treeFitsInCanvas: function(node, canvas, level) {
+        var csize = canvas.getSize();
+        var s = (this.config.multitree 
+        		&& ('$orn' in node.data) 
+        		&& node.data.$orn) || this.config.orientation;
+
+        var size = this.dispatch(s, csize.width, csize.height);
+        var baseSize = this.getTreeBaseSize(node, level, function(level, node) { 
+          return level === 0 || !node.anySubnode();
+        });
+        return (baseSize < size);
+    }
+});
+
+/*
+  Class: ST.Plot
+  
+  Custom extension of <Graph.Plot>.
+
+  Extends:
+
+  All <Graph.Plot> methods
+  
+  See also:
+  
+  <Graph.Plot>
+
+*/
+$jit.ST.Plot = new Class({
+    
+    Implements: Graph.Plot,
+    
+    /*
+       Plots a subtree from the spacetree.
+    */
+    plotSubtree: function(node, opt, scale, animating) {
+        var viz = this.viz, canvas = viz.canvas, config = viz.config;
+        scale = Math.min(Math.max(0.001, scale), 1);
+        if(scale >= 0) {
+            node.drawn = false;     
+            var ctx = canvas.getCtx();
+            var diff = viz.geom.getScaledTreePosition(node, scale);
+            ctx.translate(diff.x, diff.y);
+            ctx.scale(scale, scale);
+        }
+        this.plotTree(node, $.merge(opt, {
+          'withLabels': true,
+          'hideLabels': !!scale,
+          'plotSubtree': function(n, ch) {
+            var root = config.multitree && !('$orn' in node.data);
+            var orns = root && node.getData('orns');
+            return !root || orns.indexOf(elem.getData('orn')) > -1;
+          }
+        }), animating);
+        if(scale >= 0) node.drawn = true;
+    },   
+   
+    /*
+        Method: getAlignedPos
+        
+        Returns a *x, y* object with the position of the top/left corner of a <ST> node.
+        
+        Parameters:
+        
+        pos - (object) A <Graph.Node> position.
+        width - (number) The width of the node.
+        height - (number) The height of the node.
+        
+     */
+    getAlignedPos: function(pos, width, height) {
+        var nconfig = this.node;
+        var square, orn;
+        if(nconfig.align == "center") {
+            square = {
+                x: pos.x - width / 2,
+                y: pos.y - height / 2
+            };
+        } else if (nconfig.align == "left") {
+            orn = this.config.orientation;
+            if(orn == "bottom" || orn == "top") {
+                square = {
+                    x: pos.x - width / 2,
+                    y: pos.y
+                };
+            } else {
+                square = {
+                    x: pos.x,
+                    y: pos.y - height / 2
+                };
+            }
+        } else if(nconfig.align == "right") {
+            orn = this.config.orientation;
+            if(orn == "bottom" || orn == "top") {
+                square = {
+                    x: pos.x - width / 2,
+                    y: pos.y - height
+                };
+            } else {
+                square = {
+                    x: pos.x - width,
+                    y: pos.y - height / 2
+                };
+            }
+        } else throw "align: not implemented";
+        
+        return square;
+    },
+    
+    getOrientation: function(adj) {
+    	var config = this.config;
+    	var orn = config.orientation;
+
+    	if(config.multitree) {
+        	var nodeFrom = adj.nodeFrom;
+        	var nodeTo = adj.nodeTo;
+    		orn = (('$orn' in nodeFrom.data) 
+        		&& nodeFrom.data.$orn) 
+        		|| (('$orn' in nodeTo.data) 
+        		&& nodeTo.data.$orn);
+    	}
+
+    	return orn; 
+    }
+});
+
+/*
+  Class: ST.Label
+
+  Custom extension of <Graph.Label>. 
+  Contains custom <Graph.Label.SVG>, <Graph.Label.HTML> and <Graph.Label.Native> extensions.
+
+  Extends:
+
+  All <Graph.Label> methods and subclasses.
+
+  See also:
+
+  <Graph.Label>, <Graph.Label.Native>, <Graph.Label.HTML>, <Graph.Label.SVG>.
+ */ 
+$jit.ST.Label = {};
+
+/*
+   ST.Label.Native
+
+   Custom extension of <Graph.Label.Native>.
+
+   Extends:
+
+   All <Graph.Label.Native> methods
+
+   See also:
+
+   <Graph.Label.Native>
+*/
+$jit.ST.Label.Native = new Class({
+  Implements: Graph.Label.Native,
+
+  renderLabel: function(canvas, node, controller) {
+    var ctx = canvas.getCtx();
+    var coord = node.pos.getc(true);
+    ctx.fillText(node.name, coord.x, coord.y);
+  }
+});
+
+$jit.ST.Label.DOM = new Class({
+  Implements: Graph.Label.DOM,
+
+  /* 
+      placeLabel
+
+      Overrides abstract method placeLabel in <Graph.Plot>.
+
+      Parameters:
+
+      tag - A DOM label element.
+      node - A <Graph.Node>.
+      controller - A configuration/controller object passed to the visualization.
+     
+    */
+    placeLabel: function(tag, node, controller) {
+        var pos = node.pos.getc(true), 
+            config = this.viz.config, 
+            dim = config.Node, 
+            canvas = this.viz.canvas,
+            w = node.getData('width'),
+            h = node.getData('height'),
+            radius = canvas.getSize(),
+            labelPos, orn;
+        
+        var ox = canvas.translateOffsetX,
+            oy = canvas.translateOffsetY,
+            sx = canvas.scaleOffsetX,
+            sy = canvas.scaleOffsetY,
+            posx = pos.x * sx + ox,
+            posy = pos.y * sy + oy;
+
+        if(dim.align == "center") {
+            labelPos= {
+                x: Math.round(posx - w / 2 + radius.width/2),
+                y: Math.round(posy - h / 2 + radius.height/2)
+            };
+        } else if (dim.align == "left") {
+            orn = config.orientation;
+            if(orn == "bottom" || orn == "top") {
+                labelPos= {
+                    x: Math.round(posx - w / 2 + radius.width/2),
+                    y: Math.round(posy + radius.height/2)
+                };
+            } else {
+                labelPos= {
+                    x: Math.round(posx + radius.width/2),
+                    y: Math.round(posy - h / 2 + radius.height/2)
+                };
+            }
+        } else if(dim.align == "right") {
+            orn = config.orientation;
+            if(orn == "bottom" || orn == "top") {
+                labelPos= {
+                    x: Math.round(posx - w / 2 + radius.width/2),
+                    y: Math.round(posy - h + radius.height/2)
+                };
+            } else {
+                labelPos= {
+                    x: Math.round(posx - w + radius.width/2),
+                    y: Math.round(posy - h / 2 + radius.height/2)
+                };
+            }
+        } else throw "align: not implemented";
+
+        var style = tag.style;
+        style.left = labelPos.x + 'px';
+        style.top  = labelPos.y + 'px';
+        style.display = this.fitsInCanvas(labelPos, canvas)? '' : 'none';
+        controller.onPlaceLabel(tag, node);
+    }
+});
+
+/*
+  ST.Label.SVG
+
+  Custom extension of <Graph.Label.SVG>.
+
+  Extends:
+
+  All <Graph.Label.SVG> methods
+
+  See also:
+
+  <Graph.Label.SVG>
+*/
+$jit.ST.Label.SVG = new Class({
+  Implements: [$jit.ST.Label.DOM, Graph.Label.SVG],
+
+  initialize: function(viz) {
+    this.viz = viz;
+  }
+});
+
+/*
+   ST.Label.HTML
+
+   Custom extension of <Graph.Label.HTML>.
+
+   Extends:
+
+   All <Graph.Label.HTML> methods.
+
+   See also:
+
+   <Graph.Label.HTML>
+
+*/
+$jit.ST.Label.HTML = new Class({
+  Implements: [$jit.ST.Label.DOM, Graph.Label.HTML],
+
+  initialize: function(viz) {
+    this.viz = viz;
+  }
+});
+
+
+/*
+  Class: ST.Plot.NodeTypes
+
+  This class contains a list of <Graph.Node> built-in types. 
+  Node types implemented are 'none', 'circle', 'rectangle', 'ellipse' and 'square'.
+
+  You can add your custom node types, customizing your visualization to the extreme.
+
+  Example:
+
+  (start code js)
+    ST.Plot.NodeTypes.implement({
+      'mySpecialType': {
+        'render': function(node, canvas) {
+          //print your custom node to canvas
+        },
+        //optional
+        'contains': function(node, pos) {
+          //return true if pos is inside the node or false otherwise
+        }
+      }
+    });
+  (end code)
+
+*/
+$jit.ST.Plot.NodeTypes = new Class({
+  'none': {
+    'render': $.empty,
+    'contains': $.lambda(false)
+  },
+  'circle': {
+    'render': function(node, canvas) {
+      var dim  = node.getData('dim'),
+          pos = this.getAlignedPos(node.pos.getc(true), dim, dim),
+          dim2 = dim/2;
+      this.nodeHelper.circle.render('fill', {x:pos.x+dim2, y:pos.y+dim2}, dim2, canvas);
+    },
+    'contains': function(node, pos) {
+      var dim  = node.getData('dim'),
+          npos = this.getAlignedPos(node.pos.getc(true), dim, dim),
+          dim2 = dim/2;
+      this.nodeHelper.circle.contains({x:npos.x+dim2, y:npos.y+dim2}, dim2);
+    }
+  },
+  'square': {
+    'render': function(node, canvas) {
+      var dim  = node.getData('dim'),
+          dim2 = dim/2,
+          pos = this.getAlignedPos(node.pos.getc(true), dim, dim);
+      this.nodeHelper.square.render('fill', {x:pos.x+dim2, y:pos.y+dim2}, dim2, canvas);
+    },
+    'contains': function(node, pos) {
+      var dim  = node.getData('dim'),
+          npos = this.getAlignedPos(node.pos.getc(true), dim, dim),
+          dim2 = dim/2;
+      this.nodeHelper.square.contains({x:npos.x+dim2, y:npos.y+dim2}, dim2);
+    }
+  },
+  'ellipse': {
+    'render': function(node, canvas) {
+      var width = node.getData('width'),
+          height = node.getData('height'),
+          pos = this.getAlignedPos(node.pos.getc(true), width, height);
+      this.nodeHelper.ellipse.render('fill', {x:pos.x+width/2, y:pos.y+height/2}, width, height, canvas);
+    },
+    'contains': function(node, pos) {
+      var width = node.getData('width'),
+          height = node.getData('height'),
+          npos = this.getAlignedPos(node.pos.getc(true), width, height);
+      this.nodeHelper.ellipse.contains({x:npos.x+width/2, y:npos.y+height/2}, width, height, canvas);
+    }
+  },
+  'rectangle': {
+    'render': function(node, canvas) {
+      var width = node.getData('width'),
+          height = node.getData('height'),
+          pos = this.getAlignedPos(node.pos.getc(true), width, height);
+      this.nodeHelper.rectangle.render('fill', {x:pos.x+width/2, y:pos.y+height/2}, width, height, canvas);
+    },
+    'contains': function(node, pos) {
+      var width = node.getData('width'),
+          height = node.getData('height'),
+          npos = this.getAlignedPos(node.pos.getc(true), width, height);
+      this.nodeHelper.rectangle.contains({x:npos.x+width/2, y:npos.y+height/2}, width, height, canvas);
+    }
+  }
+});
+
+/*
+  Class: ST.Plot.EdgeTypes
+
+  This class contains a list of <Graph.Adjacence> built-in types. 
+  Edge types implemented are 'none', 'line', 'arrow', 'quadratic:begin', 'quadratic:end', 'bezier'.
+
+  You can add your custom edge types, customizing your visualization to the extreme.
+
+  Example:
+
+  (start code js)
+    ST.Plot.EdgeTypes.implement({
+      'mySpecialType': {
+        'render': function(adj, canvas) {
+          //print your custom edge to canvas
+        },
+        //optional
+        'contains': function(adj, pos) {
+          //return true if pos is inside the arc or false otherwise
+        }
+      }
+    });
+  (end code)
+
+*/
+$jit.ST.Plot.EdgeTypes = new Class({
+    'none': $.empty,
+    'line': {
+      'render': function(adj, canvas) {
+        var orn = this.getOrientation(adj),
+            nodeFrom = adj.nodeFrom, 
+            nodeTo = adj.nodeTo,
+            rel = nodeFrom._depth < nodeTo._depth,
+            from = this.viz.geom.getEdge(rel? nodeFrom:nodeTo, 'begin', orn),
+            to =  this.viz.geom.getEdge(rel? nodeTo:nodeFrom, 'end', orn);
+        this.edgeHelper.line.render(from, to, canvas);
+      },
+      'contains': function(adj, pos) {
+        var orn = this.getOrientation(adj),
+            nodeFrom = adj.nodeFrom, 
+            nodeTo = adj.nodeTo,
+            rel = nodeFrom._depth < nodeTo._depth,
+            from = this.viz.geom.getEdge(rel? nodeFrom:nodeTo, 'begin', orn),
+            to =  this.viz.geom.getEdge(rel? nodeTo:nodeFrom, 'end', orn);
+        return this.edgeHelper.line.contains(from, to, pos, this.edge.epsilon);
+      }
+    },
+     'arrow': {
+       'render': function(adj, canvas) {
+         var orn = this.getOrientation(adj),
+             node = adj.nodeFrom, 
+             child = adj.nodeTo,
+             dim = adj.getData('dim'),
+             from = this.viz.geom.getEdge(node, 'begin', orn),
+             to = this.viz.geom.getEdge(child, 'end', orn),
+             direction = adj.data.$direction,
+             inv = (direction && direction.length>1 && direction[0] != node.id);
+         this.edgeHelper.arrow.render(from, to, dim, inv, canvas);
+       },
+       'contains': function(adj, pos) {
+         var orn = this.getOrientation(adj),
+             nodeFrom = adj.nodeFrom, 
+             nodeTo = adj.nodeTo,
+             rel = nodeFrom._depth < nodeTo._depth,
+             from = this.viz.geom.getEdge(rel? nodeFrom:nodeTo, 'begin', orn),
+             to =  this.viz.geom.getEdge(rel? nodeTo:nodeFrom, 'end', orn);
+         return this.edgeHelper.arrow.contains(from, to, pos, this.edge.epsilon);
+       }
+     },
+    'quadratic:begin': {
+       'render': function(adj, canvas) {
+          var orn = this.getOrientation(adj);
+          var nodeFrom = adj.nodeFrom, 
+              nodeTo = adj.nodeTo,
+              rel = nodeFrom._depth < nodeTo._depth,
+              begin = this.viz.geom.getEdge(rel? nodeFrom:nodeTo, 'begin', orn),
+              end =  this.viz.geom.getEdge(rel? nodeTo:nodeFrom, 'end', orn),
+              dim = adj.getData('dim'),
+              ctx = canvas.getCtx();
+          ctx.beginPath();
+          ctx.moveTo(begin.x, begin.y);
+          switch(orn) {
+            case "left":
+              ctx.quadraticCurveTo(begin.x + dim, begin.y, end.x, end.y);
+              break;
+            case "right":
+              ctx.quadraticCurveTo(begin.x - dim, begin.y, end.x, end.y);
+              break;
+            case "top":
+              ctx.quadraticCurveTo(begin.x, begin.y + dim, end.x, end.y);
+              break;
+            case "bottom":
+              ctx.quadraticCurveTo(begin.x, begin.y - dim, end.x, end.y);
+              break;
+          }
+          ctx.stroke();
+        }
+     },
+    'quadratic:end': {
+       'render': function(adj, canvas) {
+          var orn = this.getOrientation(adj);
+          var nodeFrom = adj.nodeFrom, 
+              nodeTo = adj.nodeTo,
+              rel = nodeFrom._depth < nodeTo._depth,
+              begin = this.viz.geom.getEdge(rel? nodeFrom:nodeTo, 'begin', orn),
+              end =  this.viz.geom.getEdge(rel? nodeTo:nodeFrom, 'end', orn),
+              dim = adj.getData('dim'),
+              ctx = canvas.getCtx();
+          ctx.beginPath();
+          ctx.moveTo(begin.x, begin.y);
+          switch(orn) {
+            case "left":
+              ctx.quadraticCurveTo(end.x - dim, end.y, end.x, end.y);
+              break;
+            case "right":
+              ctx.quadraticCurveTo(end.x + dim, end.y, end.x, end.y);
+              break;
+            case "top":
+              ctx.quadraticCurveTo(end.x, end.y - dim, end.x, end.y);
+              break;
+            case "bottom":
+              ctx.quadraticCurveTo(end.x, end.y + dim, end.x, end.y);
+              break;
+          }
+          ctx.stroke();
+       }
+     },
+    'bezier': {
+       'render': function(adj, canvas) {
+         var orn = this.getOrientation(adj),
+             nodeFrom = adj.nodeFrom, 
+             nodeTo = adj.nodeTo,
+             rel = nodeFrom._depth < nodeTo._depth,
+             begin = this.viz.geom.getEdge(rel? nodeFrom:nodeTo, 'begin', orn),
+             end =  this.viz.geom.getEdge(rel? nodeTo:nodeFrom, 'end', orn),
+             dim = adj.getData('dim'),
+             ctx = canvas.getCtx();
+         ctx.beginPath();
+         ctx.moveTo(begin.x, begin.y);
+         switch(orn) {
+           case "left":
+             ctx.bezierCurveTo(begin.x + dim, begin.y, end.x - dim, end.y, end.x, end.y);
+             break;
+           case "right":
+             ctx.bezierCurveTo(begin.x - dim, begin.y, end.x + dim, end.y, end.x, end.y);
+             break;
+           case "top":
+             ctx.bezierCurveTo(begin.x, begin.y + dim, end.x, end.y - dim, end.x, end.y);
+             break;
+           case "bottom":
+             ctx.bezierCurveTo(begin.x, begin.y - dim, end.x, end.y + dim, end.x, end.y);
+             break;
+         }
+         ctx.stroke();
+       }
+    }
+});
+
+
+
+/*
+ * File: AreaChart.js
+ *
+*/
+
+$jit.ST.Plot.NodeTypes.implement({
+  'areachart-stacked' : {
+    'render' : function(node, canvas) {
+      var pos = node.pos.getc(true), 
+          width = node.getData('width'),
+          height = node.getData('height'),
+          algnPos = this.getAlignedPos(pos, width, height),
+          x = algnPos.x, y = algnPos.y,
+          stringArray = node.getData('stringArray'),
+          dimArray = node.getData('dimArray'),
+          valArray = node.getData('valueArray'),
+          valLeft = $.reduce(valArray, function(x, y) { return x + y[0]; }, 0),
+          valRight = $.reduce(valArray, function(x, y) { return x + y[1]; }, 0),
+          colorArray = node.getData('colorArray'),
+          colorLength = colorArray.length,
+          config = node.getData('config'),
+          gradient = node.getData('gradient'),
+          showLabels = config.showLabels,
+          aggregates = config.showAggregates,
+          label = config.Label,
+          prev = node.getData('prev');
+
+      var ctx = canvas.getCtx(), border = node.getData('border');
+      if (colorArray && dimArray && stringArray) {
+        for (var i=0, l=dimArray.length, acumLeft=0, acumRight=0, valAcum=0; i<l; i++) {
+          ctx.fillStyle = ctx.strokeStyle = colorArray[i % colorLength];
+          ctx.save();
+          if(gradient && (dimArray[i][0] > 0 || dimArray[i][1] > 0)) {
+            var h1 = acumLeft + dimArray[i][0],
+                h2 = acumRight + dimArray[i][1],
+                alpha = Math.atan((h2 - h1) / width),
+                delta = 55;
+            var linear = ctx.createLinearGradient(x + width/2, 
+                y - (h1 + h2)/2,
+                x + width/2 + delta * Math.sin(alpha),
+                y - (h1 + h2)/2 + delta * Math.cos(alpha));
+            var color = $.rgbToHex($.map($.hexToRgb(colorArray[i % colorLength].slice(1)), 
+                function(v) { return (v * 0.85) >> 0; }));
+            linear.addColorStop(0, colorArray[i % colorLength]);
+            linear.addColorStop(1, color);
+            ctx.fillStyle = linear;
+          }
+          ctx.beginPath();
+          ctx.moveTo(x, y - acumLeft);
+          ctx.lineTo(x + width, y - acumRight);
+          ctx.lineTo(x + width, y - acumRight - dimArray[i][1]);
+          ctx.lineTo(x, y - acumLeft - dimArray[i][0]);
+          ctx.lineTo(x, y - acumLeft);
+          ctx.fill();
+          ctx.restore();
+          if(border) {
+            var strong = border.name == stringArray[i];
+            var perc = strong? 0.7 : 0.8;
+            var color = $.rgbToHex($.map($.hexToRgb(colorArray[i % colorLength].slice(1)), 
+                function(v) { return (v * perc) >> 0; }));
+            ctx.strokeStyle = color;
+            ctx.lineWidth = strong? 4 : 1;
+            ctx.save();
+            ctx.beginPath();
+            if(border.index === 0) {
+              ctx.moveTo(x, y - acumLeft);
+              ctx.lineTo(x, y - acumLeft - dimArray[i][0]);
+            } else {
+              ctx.moveTo(x + width, y - acumRight);
+              ctx.lineTo(x + width, y - acumRight - dimArray[i][1]);
+            }
+            ctx.stroke();
+            ctx.restore();
+          }
+          acumLeft += (dimArray[i][0] || 0);
+          acumRight += (dimArray[i][1] || 0);
+          
+          if(dimArray[i][0] > 0)
+            valAcum += (valArray[i][0] || 0);
+        }
+        if(prev && label.type == 'Native') {
+          ctx.save();
+          ctx.beginPath();
+          ctx.fillStyle = ctx.strokeStyle = label.color;
+          ctx.font = label.style + ' ' + label.size + 'px ' + label.family;
+          ctx.textAlign = 'center';
+          ctx.textBaseline = 'middle';
+          if(aggregates(node.name, valLeft, valRight, node)) {
+            ctx.fillText(valAcum, x, y - acumLeft - config.labelOffset - label.size/2, width);
+          }
+          if(showLabels(node.name, valLeft, valRight, node)) {
+            ctx.fillText(node.name, x, y + label.size/2 + config.labelOffset);
+          }
+          ctx.restore();
+        }
+      }
+    },
+    'contains': function(node, mpos) {
+      var pos = node.pos.getc(true), 
+          width = node.getData('width'),
+          height = node.getData('height'),
+          algnPos = this.getAlignedPos(pos, width, height),
+          x = algnPos.x, y = algnPos.y,
+          dimArray = node.getData('dimArray'),
+          rx = mpos.x - x;
+      //bounding box check
+      if(mpos.x < x || mpos.x > x + width
+        || mpos.y > y || mpos.y < y - height) {
+        return false;
+      }
+      //deep check
+      for(var i=0, l=dimArray.length, lAcum=y, rAcum=y; i<l; i++) {
+        var dimi = dimArray[i];
+        lAcum -= dimi[0];
+        rAcum -= dimi[1];
+        var intersec = lAcum + (rAcum - lAcum) * rx / width;
+        if(mpos.y >= intersec) {
+          var index = +(rx > width/2);
+          return {
+            'name': node.getData('stringArray')[i],
+            'color': node.getData('colorArray')[i],
+            'value': node.getData('valueArray')[i][index],
+            'index': index
+          };
+        }
+      }
+      return false;
+    }
+  }
+});
+
+/*
+  Class: AreaChart
+  
+  A visualization that displays stacked area charts.
+  
+  Constructor Options:
+  
+  See <Options.AreaChart>.
+
+*/
+$jit.AreaChart = new Class({
+  st: null,
+  colors: ["#416D9C", "#70A35E", "#EBB056", "#C74243", "#83548B", "#909291", "#557EAA"],
+  selected: {},
+  busy: false,
+  
+  initialize: function(opt) {
+    this.controller = this.config = 
+      $.merge(Options("Canvas", "Margin", "Label", "AreaChart"), {
+        Label: { type: 'Native' }
+      }, opt);
+    //set functions for showLabels and showAggregates
+    var showLabels = this.config.showLabels,
+        typeLabels = $.type(showLabels),
+        showAggregates = this.config.showAggregates,
+        typeAggregates = $.type(showAggregates);
+    this.config.showLabels = typeLabels == 'function'? showLabels : $.lambda(showLabels);
+    this.config.showAggregates = typeAggregates == 'function'? showAggregates : $.lambda(showAggregates);
+    
+    this.initializeViz();
+  },
+  
+  initializeViz: function() {
+    var config = this.config,
+        that = this,
+        nodeType = config.type.split(":")[0],
+        nodeLabels = {};
+
+    var st = new $jit.ST({
+      injectInto: config.injectInto,
+      orientation: "bottom",
+      levelDistance: 0,
+      siblingOffset: 0,
+      subtreeOffset: 0,
+      withLabels: config.Label.type != 'Native',
+      useCanvas: config.useCanvas,
+      Label: {
+        type: config.Label.type
+      },
+      Node: {
+        overridable: true,
+        type: 'areachart-' + nodeType,
+        align: 'left',
+        width: 1,
+        height: 1
+      },
+      Edge: {
+        type: 'none'
+      },
+      Tips: {
+        enable: config.Tips.enable,
+        type: 'Native',
+        force: true,
+        onShow: function(tip, node, contains) {
+          var elem = contains;
+          config.Tips.onShow(tip, elem, node);
+        }
+      },
+      Events: {
+        enable: true,
+        type: 'Native',
+        onClick: function(node, eventInfo, evt) {
+          if(!config.filterOnClick && !config.Events.enable) return;
+          var elem = eventInfo.getContains();
+          if(elem) config.filterOnClick && that.filter(elem.name);
+          config.Events.enable && config.Events.onClick(elem, eventInfo, evt);
+        },
+        onRightClick: function(node, eventInfo, evt) {
+          if(!config.restoreOnRightClick) return;
+          that.restore();
+        },
+        onMouseMove: function(node, eventInfo, evt) {
+          if(!config.selectOnHover) return;
+          if(node) {
+            var elem = eventInfo.getContains();
+            that.select(node.id, elem.name, elem.index);
+          } else {
+            that.select(false, false, false);
+          }
+        }
+      },
+      onCreateLabel: function(domElement, node) {
+        var labelConf = config.Label,
+            valueArray = node.getData('valueArray'),
+            acumLeft = $.reduce(valueArray, function(x, y) { return x + y[0]; }, 0),
+            acumRight = $.reduce(valueArray, function(x, y) { return x + y[1]; }, 0);
+        if(node.getData('prev')) {
+          var nlbs = {
+            wrapper: document.createElement('div'),
+            aggregate: document.createElement('div'),
+            label: document.createElement('div')
+          };
+          var wrapper = nlbs.wrapper,
+              label = nlbs.label,
+              aggregate = nlbs.aggregate,
+              wrapperStyle = wrapper.style,
+              labelStyle = label.style,
+              aggregateStyle = aggregate.style;
+          //store node labels
+          nodeLabels[node.id] = nlbs;
+          //append labels
+          wrapper.appendChild(label);
+          wrapper.appendChild(aggregate);
+          if(!config.showLabels(node.name, acumLeft, acumRight, node)) {
+            label.style.display = 'none';
+          }
+          if(!config.showAggregates(node.name, acumLeft, acumRight, node)) {
+            aggregate.style.display = 'none';
+          }
+          wrapperStyle.position = 'relative';
+          wrapperStyle.overflow = 'visible';
+          wrapperStyle.fontSize = labelConf.size + 'px';
+          wrapperStyle.fontFamily = labelConf.family;
+          wrapperStyle.color = labelConf.color;
+          wrapperStyle.textAlign = 'center';
+          aggregateStyle.position = labelStyle.position = 'absolute';
+          
+          domElement.style.width = node.getData('width') + 'px';
+          domElement.style.height = node.getData('height') + 'px';
+          label.innerHTML = node.name;
+          
+          domElement.appendChild(wrapper);
+        }
+      },
+      onPlaceLabel: function(domElement, node) {
+        if(!node.getData('prev')) return;
+        var labels = nodeLabels[node.id],
+            wrapperStyle = labels.wrapper.style,
+            labelStyle = labels.label.style,
+            aggregateStyle = labels.aggregate.style,
+            width = node.getData('width'),
+            height = node.getData('height'),
+            dimArray = node.getData('dimArray'),
+            valArray = node.getData('valueArray'),
+            acumLeft = $.reduce(valArray, function(x, y) { return x + y[0]; }, 0),
+            acumRight = $.reduce(valArray, function(x, y) { return x + y[1]; }, 0),
+            font = parseInt(wrapperStyle.fontSize, 10),
+            domStyle = domElement.style;
+        
+        if(dimArray && valArray) {
+          if(config.showLabels(node.name, acumLeft, acumRight, node)) {
+            labelStyle.display = '';
+          } else {
+            labelStyle.display = 'none';
+          }
+          if(config.showAggregates(node.name, acumLeft, acumRight, node)) {
+            aggregateStyle.display = '';
+          } else {
+            aggregateStyle.display = 'none';
+          }
+          wrapperStyle.width = aggregateStyle.width = labelStyle.width = domElement.style.width = width + 'px';
+          aggregateStyle.left = labelStyle.left = -width/2 + 'px';
+          for(var i=0, l=valArray.length, acum=0, leftAcum=0; i<l; i++) {
+            if(dimArray[i][0] > 0) {
+              acum+= valArray[i][0];
+              leftAcum+= dimArray[i][0];
+            }
+          }
+          aggregateStyle.top = (-font - config.labelOffset) + 'px';
+          labelStyle.top = (config.labelOffset + leftAcum) + 'px';
+          domElement.style.top = parseInt(domElement.style.top, 10) - leftAcum + 'px';
+          domElement.style.height = wrapperStyle.height = leftAcum + 'px';
+          labels.aggregate.innerHTML = acum;
+        }
+      }
+    });
+    
+    var size = st.canvas.getSize(),
+        margin = config.Margin;
+    st.config.offsetY = -size.height/2 + margin.bottom 
+      + (config.showLabels && (config.labelOffset + config.Label.size));
+    st.config.offsetX = (margin.right - margin.left)/2;
+    this.st = st;
+    this.canvas = this.st.canvas;
+  },
+  
+ /*
+  Method: loadJSON
+ 
+  Loads JSON data into the visualization. 
+  
+  Parameters:
+  
+  json - The JSON data format. This format is described in <http://blog.thejit.org/2010/04/24/new-javascript-infovis-toolkit-visualizations/#json-data-format>.
+  
+  Example:
+  (start code js)
+  var areaChart = new $jit.AreaChart(options);
+  areaChart.loadJSON(json);
+  (end code)
+ */  
+  loadJSON: function(json) {
+    var prefix = $.time(), 
+        ch = [], 
+        st = this.st,
+        name = $.splat(json.label), 
+        color = $.splat(json.color || this.colors),
+        config = this.config,
+        gradient = !!config.type.split(":")[1],
+        animate = config.animate;
+    
+    for(var i=0, values=json.values, l=values.length; i<l-1; i++) {
+      var val = values[i], prev = values[i-1], next = values[i+1];
+      var valLeft = $.splat(values[i].values), valRight = $.splat(values[i+1].values);
+      var valArray = $.zip(valLeft, valRight);
+      var acumLeft = 0, acumRight = 0;
+      ch.push({
+        'id': prefix + val.label,
+        'name': val.label,
+        'data': {
+          'value': valArray,
+          '$valueArray': valArray,
+          '$colorArray': color,
+          '$stringArray': name,
+          '$next': next.label,
+          '$prev': prev? prev.label:false,
+          '$config': config,
+          '$gradient': gradient
+        },
+        'children': []
+      });
+    }
+    var root = {
+      'id': prefix + '$root',
+      'name': '',
+      'data': {
+        '$type': 'none',
+        '$width': 1,
+        '$height': 1
+      },
+      'children': ch
+    };
+    st.loadJSON(root);
+    
+    this.normalizeDims();
+    st.compute();
+    st.select(st.root);
+    if(animate) {
+      st.fx.animate({
+        modes: ['node-property:height:dimArray'],
+        duration:1500
+      });
+    }
+  },
+  
+ /*
+  Method: updateJSON
+ 
+  Use this method when updating values for the current JSON data. If the items specified by the JSON data already exist in the graph then their values will be updated.
+  
+  Parameters:
+  
+  json - (object) JSON data to be updated. The JSON format corresponds to the one described in <AreaChart.loadJSON>.
+  onComplete - (object) A callback object to be called when the animation transition when updating the data end.
+  
+  Example:
+  
+  (start code js)
+  areaChart.updateJSON(json, {
+    onComplete: function() {
+      alert('update complete!');
+    }
+  });
+  (end code)
+ */  
+  updateJSON: function(json, onComplete) {
+    if(this.busy) return;
+    this.busy = true;
+    
+    var st = this.st,
+        graph = st.graph,
+        labels = json.label && $.splat(json.label),
+        values = json.values,
+        animate = this.config.animate,
+        that = this;
+    $.each(values, function(v) {
+      var n = graph.getByName(v.label);
+      if(n) {
+        v.values = $.splat(v.values);
+        var stringArray = n.getData('stringArray'),
+            valArray = n.getData('valueArray');
+        $.each(valArray, function(a, i) {
+          a[0] = v.values[i];
+          if(labels) stringArray[i] = labels[i];
+        });
+        n.setData('valueArray', valArray);
+        var prev = n.getData('prev'),
+            next = n.getData('next'),
+            nextNode = graph.getByName(next);
+        if(prev) {
+          var p = graph.getByName(prev);
+          if(p) {
+            var valArray = p.getData('valueArray');
+            $.each(valArray, function(a, i) {
+              a[1] = v.values[i];
+            });
+          }
+        }
+        if(!nextNode) {
+          var valArray = n.getData('valueArray');
+          $.each(valArray, function(a, i) {
+            a[1] = v.values[i];
+          });
+        }
+      }
+    });
+    this.normalizeDims();
+    st.compute();
+    st.select(st.root);
+    if(animate) {
+      st.fx.animate({
+        modes: ['node-property:height:dimArray'],
+        duration:1500,
+        onComplete: function() {
+          that.busy = false;
+          onComplete && onComplete.onComplete();
+        }
+      });
+    }
+  },
+  
+/*
+  Method: filter
+ 
+  Filter selected stacks, collapsing all other stacks. You can filter multiple stacks at the same time.
+  
+  Parameters:
+  
+  Variable strings arguments with the name of the stacks.
+  
+  Example:
+  
+  (start code js)
+  areaChart.filter('label A', 'label C');
+  (end code)
+  
+  See also:
+  
+  <AreaChart.restore>.
+ */  
+  filter: function() {
+    if(this.busy) return;
+    this.busy = true;
+    if(this.config.Tips.enable) this.st.tips.hide();
+    this.select(false, false, false);
+    var args = Array.prototype.slice.call(arguments);
+    var rt = this.st.graph.getNode(this.st.root);
+    var that = this;
+    rt.eachAdjacency(function(adj) {
+      var n = adj.nodeTo, 
+          dimArray = n.getData('dimArray'),
+          stringArray = n.getData('stringArray');
+      n.setData('dimArray', $.map(dimArray, function(d, i) {
+        return ($.indexOf(args, stringArray[i]) > -1)? d:[0, 0];
+      }), 'end');
+    });
+    this.st.fx.animate({
+      modes: ['node-property:dimArray'],
+      duration:1500,
+      onComplete: function() {
+        that.busy = false;
+      }
+    });
+  },
+  
+  /*
+  Method: restore
+ 
+  Sets all stacks that could have been filtered visible.
+  
+  Example:
+  
+  (start code js)
+  areaChart.restore();
+  (end code)
+  
+  See also:
+  
+  <AreaChart.filter>.
+ */  
+  restore: function() {
+    if(this.busy) return;
+    this.busy = true;
+    if(this.config.Tips.enable) this.st.tips.hide();
+    this.select(false, false, false);
+    this.normalizeDims();
+    var that = this;
+    this.st.fx.animate({
+      modes: ['node-property:height:dimArray'],
+      duration:1500,
+      onComplete: function() {
+        that.busy = false;
+      }
+    });
+  },
+  //adds the little brown bar when hovering the node
+  select: function(id, name, index) {
+    if(!this.config.selectOnHover) return;
+    var s = this.selected;
+    if(s.id != id || s.name != name 
+        || s.index != index) {
+      s.id = id;
+      s.name = name;
+      s.index = index;
+      this.st.graph.eachNode(function(n) {
+        n.setData('border', false);
+      });
+      if(id) {
+        var n = this.st.graph.getNode(id);
+        n.setData('border', s);
+        var link = index === 0? 'prev':'next';
+        link = n.getData(link);
+        if(link) {
+          n = this.st.graph.getByName(link);
+          if(n) {
+            n.setData('border', {
+              name: name,
+              index: 1-index
+            });
+          }
+        }
+      }
+      this.st.plot();
+    }
+  },
+  
+  /*
+    Method: getLegend
+   
+    Returns an object containing as keys the legend names and as values hex strings with color values.
+    
+    Example:
+    
+    (start code js)
+    var legend = areaChart.getLegend();
+    (end code)
+ */  
+  getLegend: function() {
+    var legend = {};
+    var n;
+    this.st.graph.getNode(this.st.root).eachAdjacency(function(adj) {
+      n = adj.nodeTo;
+    });
+    var colors = n.getData('colorArray'),
+        len = colors.length;
+    $.each(n.getData('stringArray'), function(s, i) {
+      legend[s] = colors[i % len];
+    });
+    return legend;
+  },
+  
+  /*
+    Method: getMaxValue
+   
+    Returns the maximum accumulated value for the stacks. This method is used for normalizing the graph heights according to the canvas height.
+    
+    Example:
+    
+    (start code js)
+    var ans = areaChart.getMaxValue();
+    (end code)
+    
+    In some cases it could be useful to override this method to normalize heights for a group of AreaCharts, like when doing small multiples.
+    
+    Example:
+    
+    (start code js)
+    //will return 100 for all AreaChart instances,
+    //displaying all of them with the same scale
+    $jit.AreaChart.implement({
+      'getMaxValue': function() {
+        return 100;
+      }
+    });
+    (end code)
+    
+*/  
+  getMaxValue: function() {
+    var maxValue = 0;
+    this.st.graph.eachNode(function(n) {
+      var valArray = n.getData('valueArray'),
+          acumLeft = 0, acumRight = 0;
+      $.each(valArray, function(v) { 
+        acumLeft += +v[0];
+        acumRight += +v[1];
+      });
+      var acum = acumRight>acumLeft? acumRight:acumLeft;
+      maxValue = maxValue>acum? maxValue:acum;
+    });
+    return maxValue;
+  },
+  
+  normalizeDims: function() {
+    //number of elements
+    var root = this.st.graph.getNode(this.st.root), l=0;
+    root.eachAdjacency(function() {
+      l++;
+    });
+    var maxValue = this.getMaxValue() || 1,
+        size = this.st.canvas.getSize(),
+        config = this.config,
+        margin = config.Margin,
+        labelOffset = config.labelOffset + config.Label.size,
+        fixedDim = (size.width - (margin.left + margin.right)) / l,
+        animate = config.animate,
+        height = size.height - (margin.top + margin.bottom) - (config.showAggregates && labelOffset) 
+          - (config.showLabels && labelOffset);
+    this.st.graph.eachNode(function(n) {
+      var acumLeft = 0, acumRight = 0, animateValue = [];
+      $.each(n.getData('valueArray'), function(v) {
+        acumLeft += +v[0];
+        acumRight += +v[1];
+        animateValue.push([0, 0]);
+      });
+      var acum = acumRight>acumLeft? acumRight:acumLeft;
+      n.setData('width', fixedDim);
+      if(animate) {
+        n.setData('height', acum * height / maxValue, 'end');
+        n.setData('dimArray', $.map(n.getData('valueArray'), function(n) { 
+          return [n[0] * height / maxValue, n[1] * height / maxValue]; 
+        }), 'end');
+        var dimArray = n.getData('dimArray');
+        if(!dimArray) {
+          n.setData('dimArray', animateValue);
+        }
+      } else {
+        n.setData('height', acum * height / maxValue);
+        n.setData('dimArray', $.map(n.getData('valueArray'), function(n) { 
+          return [n[0] * height / maxValue, n[1] * height / maxValue]; 
+        }));
+      }
+    });
+  }
+});
+
+/*
+ * File: Options.BarChart.js
+ *
+*/
+
+/*
+  Object: Options.BarChart
+  
+  <BarChart> options. 
+  Other options included in the BarChart are <Options.Canvas>, <Options.Label>, <Options.Margin>, <Options.Tips> and <Options.Events>.
+  
+  Syntax:
+  
+  (start code js)
+
+  Options.BarChart = {
+    animate: true,
+    labelOffset: 3,
+    barsOffset: 0,
+    type: 'stacked',
+    hoveredColor: '#9fd4ff',
+    orientation: 'horizontal',
+    showAggregates: true,
+    showLabels: true
+  };
+  
+  (end code)
+  
+  Example:
+  
+  (start code js)
+
+  var barChart = new $jit.BarChart({
+    animate: true,
+    barsOffset: 10,
+    type: 'stacked:gradient'
+  });
+  
+  (end code)
+
+  Parameters:
+  
+  animate - (boolean) Default's *true*. Whether to add animated transitions when filtering/restoring stacks.
+  offset - (number) Default's *25*. Adds margin between the visualization and the canvas.
+  labelOffset - (number) Default's *3*. Adds margin between the label and the default place where it should be drawn.
+  barsOffset - (number) Default's *0*. Separation between bars.
+  type - (string) Default's *'stacked'*. Stack or grouped styles. Posible values are 'stacked', 'grouped', 'stacked:gradient', 'grouped:gradient' to add gradients.
+  hoveredColor - (boolean|string) Default's *'#9fd4ff'*. Sets the selected color for a hovered bar stack.
+  orientation - (string) Default's 'horizontal'. Sets the direction of the bars. Possible options are 'vertical' or 'horizontal'.
+  showAggregates - (boolean) Default's *true*. Display the sum of the values of the different stacks.
+  showLabels - (boolean) Default's *true*. Display the name of the slots.
+  
+*/
+
+Options.BarChart = {
+  $extend: true,
+  
+  animate: true,
+  type: 'stacked', //stacked, grouped, : gradient
+  labelOffset: 3, //label offset
+  barsOffset: 0, //distance between bars
+  hoveredColor: '#9fd4ff',
+  orientation: 'horizontal',
+  showAggregates: true,
+  showLabels: true,
+  Tips: {
+    enable: false,
+    onShow: $.empty,
+    onHide: $.empty
+  },
+  Events: {
+    enable: false,
+    onClick: $.empty
+  }
+};
+
+/*
+ * File: BarChart.js
+ *
+*/
+
+$jit.ST.Plot.NodeTypes.implement({
+  'barchart-stacked' : {
+    'render' : function(node, canvas) {
+      var pos = node.pos.getc(true), 
+          width = node.getData('width'),
+          height = node.getData('height'),
+          algnPos = this.getAlignedPos(pos, width, height),
+          x = algnPos.x, y = algnPos.y,
+          dimArray = node.getData('dimArray'),
+          valueArray = node.getData('valueArray'),
+          colorArray = node.getData('colorArray'),
+          colorLength = colorArray.length,
+          stringArray = node.getData('stringArray');
+
+      var ctx = canvas.getCtx(),
+          opt = {},
+          border = node.getData('border'),
+          gradient = node.getData('gradient'),
+          config = node.getData('config'),
+          horz = config.orientation == 'horizontal',
+          aggregates = config.showAggregates,
+          showLabels = config.showLabels,
+          label = config.Label;
+      
+      if (colorArray && dimArray && stringArray) {
+        for (var i=0, l=dimArray.length, acum=0, valAcum=0; i<l; i++) {
+          ctx.fillStyle = ctx.strokeStyle = colorArray[i % colorLength];
+          if(gradient) {
+            var linear;
+            if(horz) {
+              linear = ctx.createLinearGradient(x + acum + dimArray[i]/2, y, 
+                  x + acum + dimArray[i]/2, y + height);
+            } else {
+              linear = ctx.createLinearGradient(x, y - acum - dimArray[i]/2, 
+                  x + width, y - acum- dimArray[i]/2);
+            }
+            var color = $.rgbToHex($.map($.hexToRgb(colorArray[i % colorLength].slice(1)), 
+                function(v) { return (v * 0.5) >> 0; }));
+            linear.addColorStop(0, color);
+            linear.addColorStop(0.5, colorArray[i % colorLength]);
+            linear.addColorStop(1, color);
+            ctx.fillStyle = linear;
+          }
+          if(horz) {
+            ctx.fillRect(x + acum, y, dimArray[i], height);
+          } else {
+            ctx.fillRect(x, y - acum - dimArray[i], width, dimArray[i]);
+          }
+          if(border && border.name == stringArray[i]) {
+            opt.acum = acum;
+            opt.dimValue = dimArray[i];
+          }
+          acum += (dimArray[i] || 0);
+          valAcum += (valueArray[i] || 0);
+        }
+        if(border) {
+          ctx.save();
+          ctx.lineWidth = 2;
+          ctx.strokeStyle = border.color;
+          if(horz) {
+            ctx.strokeRect(x + opt.acum + 1, y + 1, opt.dimValue -2, height - 2);
+          } else {
+            ctx.strokeRect(x + 1, y - opt.acum - opt.dimValue + 1, width -2, opt.dimValue -2);
+          }
+          ctx.restore();
+        }
+        if(label.type == 'Native') {
+          ctx.save();
+          ctx.fillStyle = ctx.strokeStyle = label.color;
+          ctx.font = label.style + ' ' + label.size + 'px ' + label.family;
+          ctx.textBaseline = 'middle';
+          if(aggregates(node.name, valAcum)) {
+            if(horz) {
+              ctx.textAlign = 'right';
+              ctx.fillText(valAcum, x + acum - config.labelOffset, y + height/2);
+            } else {
+              ctx.textAlign = 'center';
+              ctx.fillText(valAcum, x + width/2, y - height - label.size/2 - config.labelOffset);
+            }
+          }
+          if(showLabels(node.name, valAcum, node)) {
+            if(horz) {
+              ctx.textAlign = 'center';
+              ctx.translate(x - config.labelOffset - label.size/2, y + height/2);
+              ctx.rotate(Math.PI / 2);
+              ctx.fillText(node.name, 0, 0);
+            } else {
+              ctx.textAlign = 'center';
+              ctx.fillText(node.name, x + width/2, y + label.size/2 + config.labelOffset);
+            }
+          }
+          ctx.restore();
+        }
+      }
+    },
+    'contains': function(node, mpos) {
+      var pos = node.pos.getc(true), 
+          width = node.getData('width'),
+          height = node.getData('height'),
+          algnPos = this.getAlignedPos(pos, width, height),
+          x = algnPos.x, y = algnPos.y,
+          dimArray = node.getData('dimArray'),
+          config = node.getData('config'),
+          rx = mpos.x - x,
+          horz = config.orientation == 'horizontal';
+      //bounding box check
+      if(horz) {
+        if(mpos.x < x || mpos.x > x + width
+            || mpos.y > y + height || mpos.y < y) {
+            return false;
+          }
+      } else {
+        if(mpos.x < x || mpos.x > x + width
+            || mpos.y > y || mpos.y < y - height) {
+            return false;
+          }
+      }
+      //deep check
+      for(var i=0, l=dimArray.length, acum=(horz? x:y); i<l; i++) {
+        var dimi = dimArray[i];
+        if(horz) {
+          acum += dimi;
+          var intersec = acum;
+          if(mpos.x <= intersec) {
+            return {
+              'name': node.getData('stringArray')[i],
+              'color': node.getData('colorArray')[i],
+              'value': node.getData('valueArray')[i],
+              'label': node.name
+            };
+          }
+        } else {
+          acum -= dimi;
+          var intersec = acum;
+          if(mpos.y >= intersec) {
+            return {
+              'name': node.getData('stringArray')[i],
+              'color': node.getData('colorArray')[i],
+              'value': node.getData('valueArray')[i],
+              'label': node.name
+            };
+          }
+        }
+      }
+      return false;
+    }
+  },
+  'barchart-grouped' : {
+    'render' : function(node, canvas) {
+      var pos = node.pos.getc(true), 
+          width = node.getData('width'),
+          height = node.getData('height'),
+          algnPos = this.getAlignedPos(pos, width, height),
+          x = algnPos.x, y = algnPos.y,
+          dimArray = node.getData('dimArray'),
+          valueArray = node.getData('valueArray'),
+          valueLength = valueArray.length,
+          colorArray = node.getData('colorArray'),
+          colorLength = colorArray.length,
+          stringArray = node.getData('stringArray'); 
+
+      var ctx = canvas.getCtx(),
+          opt = {},
+          border = node.getData('border'),
+          gradient = node.getData('gradient'),
+          config = node.getData('config'),
+          horz = config.orientation == 'horizontal',
+          aggregates = config.showAggregates,
+          showLabels = config.showLabels,
+          label = config.Label,
+          fixedDim = (horz? height : width) / valueLength;
+      
+      if (colorArray && dimArray && stringArray) {
+        for (var i=0, l=valueLength, acum=0, valAcum=0; i<l; i++) {
+          ctx.fillStyle = ctx.strokeStyle = colorArray[i % colorLength];
+          if(gradient) {
+            var linear;
+            if(horz) {
+              linear = ctx.createLinearGradient(x + dimArray[i]/2, y + fixedDim * i, 
+                  x + dimArray[i]/2, y + fixedDim * (i + 1));
+            } else {
+              linear = ctx.createLinearGradient(x + fixedDim * i, y - dimArray[i]/2, 
+                  x + fixedDim * (i + 1), y - dimArray[i]/2);
+            }
+            var color = $.rgbToHex($.map($.hexToRgb(colorArray[i % colorLength].slice(1)), 
+                function(v) { return (v * 0.5) >> 0; }));
+            linear.addColorStop(0, color);
+            linear.addColorStop(0.5, colorArray[i % colorLength]);
+            linear.addColorStop(1, color);
+            ctx.fillStyle = linear;
+          }
+          if(horz) {
+            ctx.fillRect(x, y + fixedDim * i, dimArray[i], fixedDim);
+          } else {
+            ctx.fillRect(x + fixedDim * i, y - dimArray[i], fixedDim, dimArray[i]);
+          }
+          if(border && border.name == stringArray[i]) {
+            opt.acum = fixedDim * i;
+            opt.dimValue = dimArray[i];
+          }
+          acum += (dimArray[i] || 0);
+          valAcum += (valueArray[i] || 0);
+        }
+        if(border) {
+          ctx.save();
+          ctx.lineWidth = 2;
+          ctx.strokeStyle = border.color;
+          if(horz) {
+            ctx.strokeRect(x + 1, y + opt.acum + 1, opt.dimValue -2, fixedDim - 2);
+          } else {
+            ctx.strokeRect(x + opt.acum + 1, y - opt.dimValue + 1, fixedDim -2, opt.dimValue -2);
+          }
+          ctx.restore();
+        }
+        if(label.type == 'Native') {
+          ctx.save();
+          ctx.fillStyle = ctx.strokeStyle = label.color;
+          ctx.font = label.style + ' ' + label.size + 'px ' + label.family;
+          ctx.textBaseline = 'middle';
+          if(aggregates(node.name, valAcum)) {
+            if(horz) {
+              ctx.textAlign = 'right';
+              ctx.fillText(valAcum, x + Math.max.apply(null, dimArray) - config.labelOffset, y + height/2);
+            } else {
+              ctx.textAlign = 'center';
+              ctx.fillText(valAcum, x + width/2, y - Math.max.apply(null, dimArray) - label.size/2 - config.labelOffset);
+            }
+          }
+          if(showLabels(node.name, valAcum, node)) {
+            if(horz) {
+              ctx.textAlign = 'center';
+              ctx.translate(x - config.labelOffset - label.size/2, y + height/2);
+              ctx.rotate(Math.PI / 2);
+              ctx.fillText(node.name, 0, 0);
+            } else {
+              ctx.textAlign = 'center';
+              ctx.fillText(node.name, x + width/2, y + label.size/2 + config.labelOffset);
+            }
+          }
+          ctx.restore();
+        }
+      }
+    },
+    'contains': function(node, mpos) {
+      var pos = node.pos.getc(true), 
+          width = node.getData('width'),
+          height = node.getData('height'),
+          algnPos = this.getAlignedPos(pos, width, height),
+          x = algnPos.x, y = algnPos.y,
+          dimArray = node.getData('dimArray'),
+          len = dimArray.length,
+          config = node.getData('config'),
+          rx = mpos.x - x,
+          horz = config.orientation == 'horizontal',
+          fixedDim = (horz? height : width) / len;
+      //bounding box check
+      if(horz) {
+        if(mpos.x < x || mpos.x > x + width
+            || mpos.y > y + height || mpos.y < y) {
+            return false;
+          }
+      } else {
+        if(mpos.x < x || mpos.x > x + width
+            || mpos.y > y || mpos.y < y - height) {
+            return false;
+          }
+      }
+      //deep check
+      for(var i=0, l=dimArray.length; i<l; i++) {
+        var dimi = dimArray[i];
+        if(horz) {
+          var limit = y + fixedDim * i;
+          if(mpos.x <= x+ dimi && mpos.y >= limit && mpos.y <= limit + fixedDim) {
+            return {
+              'name': node.getData('stringArray')[i],
+              'color': node.getData('colorArray')[i],
+              'value': node.getData('valueArray')[i],
+              'label': node.name
+            };
+          }
+        } else {
+          var limit = x + fixedDim * i;
+          if(mpos.x >= limit && mpos.x <= limit + fixedDim && mpos.y >= y - dimi) {
+            return {
+              'name': node.getData('stringArray')[i],
+              'color': node.getData('colorArray')[i],
+              'value': node.getData('valueArray')[i],
+              'label': node.name
+            };
+          }
+        }
+      }
+      return false;
+    }
+  }
+});
+
+/*
+  Class: BarChart
+  
+  A visualization that displays stacked bar charts.
+  
+  Constructor Options:
+  
+  See <Options.BarChart>.
+
+*/
+$jit.BarChart = new Class({
+  st: null,
+  colors: ["#416D9C", "#70A35E", "#EBB056", "#C74243", "#83548B", "#909291", "#557EAA"],
+  selected: {},
+  busy: false,
+  
+  initialize: function(opt) {
+    this.controller = this.config = 
+      $.merge(Options("Canvas", "Margin", "Label", "BarChart"), {
+        Label: { type: 'Native' }
+      }, opt);
+    //set functions for showLabels and showAggregates
+    var showLabels = this.config.showLabels,
+        typeLabels = $.type(showLabels),
+        showAggregates = this.config.showAggregates,
+        typeAggregates = $.type(showAggregates);
+    this.config.showLabels = typeLabels == 'function'? showLabels : $.lambda(showLabels);
+    this.config.showAggregates = typeAggregates == 'function'? showAggregates : $.lambda(showAggregates);
+    
+    this.initializeViz();
+  },
+  
+  initializeViz: function() {
+    var config = this.config, that = this;
+    var nodeType = config.type.split(":")[0],
+        horz = config.orientation == 'horizontal',
+        nodeLabels = {};
+    
+    var st = new $jit.ST({
+      injectInto: config.injectInto,
+      orientation: horz? 'left' : 'bottom',
+      levelDistance: 0,
+      siblingOffset: config.barsOffset,
+      subtreeOffset: 0,
+      withLabels: config.Label.type != 'Native',      
+      useCanvas: config.useCanvas,
+      Label: {
+        type: config.Label.type
+      },
+      Node: {
+        overridable: true,
+        type: 'barchart-' + nodeType,
+        align: 'left',
+        width: 1,
+        height: 1
+      },
+      Edge: {
+        type: 'none'
+      },
+      Tips: {
+        enable: config.Tips.enable,
+        type: 'Native',
+        force: true,
+        onShow: function(tip, node, contains) {
+          var elem = contains;
+          config.Tips.onShow(tip, elem, node);
+        }
+      },
+      Events: {
+        enable: true,
+        type: 'Native',
+        onClick: function(node, eventInfo, evt) {
+          if(!config.Events.enable) return;
+          var elem = eventInfo.getContains();
+          config.Events.onClick(elem, eventInfo, evt);
+        },
+        onMouseMove: function(node, eventInfo, evt) {
+          if(!config.hoveredColor) return;
+          if(node) {
+            var elem = eventInfo.getContains();
+            that.select(node.id, elem.name, elem.index);
+          } else {
+            that.select(false, false, false);
+          }
+        }
+      },
+      onCreateLabel: function(domElement, node) {
+        var labelConf = config.Label,
+            valueArray = node.getData('valueArray'),
+            acum = $.reduce(valueArray, function(x, y) { return x + y; }, 0);
+        var nlbs = {
+          wrapper: document.createElement('div'),
+          aggregate: document.createElement('div'),
+          label: document.createElement('div')
+        };
+        var wrapper = nlbs.wrapper,
+            label = nlbs.label,
+            aggregate = nlbs.aggregate,
+            wrapperStyle = wrapper.style,
+            labelStyle = label.style,
+            aggregateStyle = aggregate.style;
+        //store node labels
+        nodeLabels[node.id] = nlbs;
+        //append labels
+        wrapper.appendChild(label);
+        wrapper.appendChild(aggregate);
+        if(!config.showLabels(node.name, acum, node)) {
+          labelStyle.display = 'none';
+        }
+        if(!config.showAggregates(node.name, acum, node)) {
+          aggregateStyle.display = 'none';
+        }
+        wrapperStyle.position = 'relative';
+        wrapperStyle.overflow = 'visible';
+        wrapperStyle.fontSize = labelConf.size + 'px';
+        wrapperStyle.fontFamily = labelConf.family;
+        wrapperStyle.color = labelConf.color;
+        wrapperStyle.textAlign = 'center';
+        aggregateStyle.position = labelStyle.position = 'absolute';
+        
+        domElement.style.width = node.getData('width') + 'px';
+        domElement.style.height = node.getData('height') + 'px';
+        aggregateStyle.left = labelStyle.left =  '0px';
+
+        label.innerHTML = node.name;
+        
+        domElement.appendChild(wrapper);
+      },
+      onPlaceLabel: function(domElement, node) {
+        if(!nodeLabels[node.id]) return;
+        var labels = nodeLabels[node.id],
+            wrapperStyle = labels.wrapper.style,
+            labelStyle = labels.label.style,
+            aggregateStyle = labels.aggregate.style,
+            grouped = config.type.split(':')[0] == 'grouped',
+            horz = config.orientation == 'horizontal',
+            dimArray = node.getData('dimArray'),
+            valArray = node.getData('valueArray'),
+            width = (grouped && horz)? Math.max.apply(null, dimArray) : node.getData('width'),
+            height = (grouped && !horz)? Math.max.apply(null, dimArray) : node.getData('height'),
+            font = parseInt(wrapperStyle.fontSize, 10),
+            domStyle = domElement.style;
+            
+        
+        if(dimArray && valArray) {
+          wrapperStyle.width = aggregateStyle.width = labelStyle.width = domElement.style.width = width + 'px';
+          for(var i=0, l=valArray.length, acum=0; i<l; i++) {
+            if(dimArray[i] > 0) {
+              acum+= valArray[i];
+            }
+          }
+          if(config.showLabels(node.name, acum, node)) {
+            labelStyle.display = '';
+          } else {
+            labelStyle.display = 'none';
+          }
+          if(config.showAggregates(node.name, acum, node)) {
+            aggregateStyle.display = '';
+          } else {
+            aggregateStyle.display = 'none';
+          }
+          if(config.orientation == 'horizontal') {
+            aggregateStyle.textAlign = 'right';
+            labelStyle.textAlign = 'left';
+            labelStyle.textIndex = aggregateStyle.textIndent = config.labelOffset + 'px';
+            aggregateStyle.top = labelStyle.top = (height-font)/2 + 'px';
+            domElement.style.height = wrapperStyle.height = height + 'px';
+          } else {
+            aggregateStyle.top = (-font - config.labelOffset) + 'px';
+            labelStyle.top = (config.labelOffset + height) + 'px';
+            domElement.style.top = parseInt(domElement.style.top, 10) - height + 'px';
+            domElement.style.height = wrapperStyle.height = height + 'px';
+          }
+          labels.aggregate.innerHTML = acum;
+        }
+      }
+    });
+    
+    var size = st.canvas.getSize(),
+        margin = config.Margin;
+    if(horz) {
+      st.config.offsetX = size.width/2 - margin.left
+        - (config.showLabels && (config.labelOffset + config.Label.size));    
+      st.config.offsetY = (margin.bottom - margin.top)/2;
+    } else {
+      st.config.offsetY = -size.height/2 + margin.bottom 
+        + (config.showLabels && (config.labelOffset + config.Label.size));
+      st.config.offsetX = (margin.right - margin.left)/2;
+    }
+    this.st = st;
+    this.canvas = this.st.canvas;
+  },
+  
+  /*
+    Method: loadJSON
+   
+    Loads JSON data into the visualization. 
+    
+    Parameters:
+    
+    json - The JSON data format. This format is described in <http://blog.thejit.org/2010/04/24/new-javascript-infovis-toolkit-visualizations/#json-data-format>.
+    
+    Example:
+    (start code js)
+    var barChart = new $jit.BarChart(options);
+    barChart.loadJSON(json);
+    (end code)
+ */  
+  loadJSON: function(json) {
+    if(this.busy) return;
+    this.busy = true;
+    
+    var prefix = $.time(), 
+        ch = [], 
+        st = this.st,
+        name = $.splat(json.label), 
+        color = $.splat(json.color || this.colors),
+        config = this.config,
+        gradient = !!config.type.split(":")[1],
+        animate = config.animate,
+        horz = config.orientation == 'horizontal',
+        that = this;
+    
+    for(var i=0, values=json.values, l=values.length; i<l; i++) {
+      var val = values[i]
+      var valArray = $.splat(values[i].values);
+      var acum = 0;
+      ch.push({
+        'id': prefix + val.label,
+        'name': val.label,
+        'data': {
+          'value': valArray,
+          '$valueArray': valArray,
+          '$colorArray': color,
+          '$stringArray': name,
+          '$gradient': gradient,
+          '$config': config
+        },
+        'children': []
+      });
+    }
+    var root = {
+      'id': prefix + '$root',
+      'name': '',
+      'data': {
+        '$type': 'none',
+        '$width': 1,
+        '$height': 1
+      },
+      'children': ch
+    };
+    st.loadJSON(root);
+    
+    this.normalizeDims();
+    st.compute();
+    st.select(st.root);
+    if(animate) {
+      if(horz) {
+        st.fx.animate({
+          modes: ['node-property:width:dimArray'],
+          duration:1500,
+          onComplete: function() {
+            that.busy = false;
+          }
+        });
+      } else {
+        st.fx.animate({
+          modes: ['node-property:height:dimArray'],
+          duration:1500,
+          onComplete: function() {
+            that.busy = false;
+          }
+        });
+      }
+    } else {
+      this.busy = false;
+    }
+  },
+  
+  /*
+    Method: updateJSON
+   
+    Use this method when updating values for the current JSON data. If the items specified by the JSON data already exist in the graph then their values will be updated.
+    
+    Parameters:
+    
+    json - (object) JSON data to be updated. The JSON format corresponds to the one described in <BarChart.loadJSON>.
+    onComplete - (object) A callback object to be called when the animation transition when updating the data end.
+    
+    Example:
+    
+    (start code js)
+    barChart.updateJSON(json, {
+      onComplete: function() {
+        alert('update complete!');
+      }
+    });
+    (end code)
+ */  
+  updateJSON: function(json, onComplete) {
+    if(this.busy) return;
+    this.busy = true;
+    
+    var st = this.st;
+    var graph = st.graph;
+    var values = json.values;
+    var animate = this.config.animate;
+    var that = this;
+    var horz = this.config.orientation == 'horizontal';
+    $.each(values, function(v) {
+      var n = graph.getByName(v.label);
+      if(n) {
+        n.setData('valueArray', $.splat(v.values));
+        if(json.label) {
+          n.setData('stringArray', $.splat(json.label));
+        }
+      }
+    });
+    this.normalizeDims();
+    st.compute();
+    st.select(st.root);
+    if(animate) {
+      if(horz) {
+        st.fx.animate({
+          modes: ['node-property:width:dimArray'],
+          duration:1500,
+          onComplete: function() {
+            that.busy = false;
+            onComplete && onComplete.onComplete();
+          }
+        });
+      } else {
+        st.fx.animate({
+          modes: ['node-property:height:dimArray'],
+          duration:1500,
+          onComplete: function() {
+            that.busy = false;
+            onComplete && onComplete.onComplete();
+          }
+        });
+      }
+    }
+  },
+  
+  //adds the little brown bar when hovering the node
+  select: function(id, name) {
+    if(!this.config.hoveredColor) return;
+    var s = this.selected;
+    if(s.id != id || s.name != name) {
+      s.id = id;
+      s.name = name;
+      s.color = this.config.hoveredColor;
+      this.st.graph.eachNode(function(n) {
+        if(id == n.id) {
+          n.setData('border', s);
+        } else {
+          n.setData('border', false);
+        }
+      });
+      this.st.plot();
+    }
+  },
+  
+  /*
+    Method: getLegend
+   
+    Returns an object containing as keys the legend names and as values hex strings with color values.
+    
+    Example:
+    
+    (start code js)
+    var legend = barChart.getLegend();
+    (end code)
+  */  
+  getLegend: function() {
+    var legend = {};
+    var n;
+    this.st.graph.getNode(this.st.root).eachAdjacency(function(adj) {
+      n = adj.nodeTo;
+    });
+    var colors = n.getData('colorArray'),
+        len = colors.length;
+    $.each(n.getData('stringArray'), function(s, i) {
+      legend[s] = colors[i % len];
+    });
+    return legend;
+  },
+  
+  /*
+    Method: getMaxValue
+   
+    Returns the maximum accumulated value for the stacks. This method is used for normalizing the graph heights according to the canvas height.
+    
+    Example:
+    
+    (start code js)
+    var ans = barChart.getMaxValue();
+    (end code)
+    
+    In some cases it could be useful to override this method to normalize heights for a group of BarCharts, like when doing small multiples.
+    
+    Example:
+    
+    (start code js)
+    //will return 100 for all BarChart instances,
+    //displaying all of them with the same scale
+    $jit.BarChart.implement({
+      'getMaxValue': function() {
+        return 100;
+      }
+    });
+    (end code)
+    
+  */  
+  getMaxValue: function() {
+    var maxValue = 0, stacked = this.config.type.split(':')[0] == 'stacked';
+    this.st.graph.eachNode(function(n) {
+      var valArray = n.getData('valueArray'),
+          acum = 0;
+      if(!valArray) return;
+      if(stacked) {
+        $.each(valArray, function(v) { 
+          acum += +v;
+        });
+      } else {
+        acum = Math.max.apply(null, valArray);
+      }
+      maxValue = maxValue>acum? maxValue:acum;
+    });
+    return maxValue;
+  },
+  
+  setBarType: function(type) {
+    this.config.type = type;
+    this.st.config.Node.type = 'barchart-' + type.split(':')[0];
+  },
+  
+  normalizeDims: function() {
+    //number of elements
+    var root = this.st.graph.getNode(this.st.root), l=0;
+    root.eachAdjacency(function() {
+      l++;
+    });
+    var maxValue = this.getMaxValue() || 1,
+        size = this.st.canvas.getSize(),
+        config = this.config,
+        margin = config.Margin,
+        marginWidth = margin.left + margin.right,
+        marginHeight = margin.top + margin.bottom,
+        horz = config.orientation == 'horizontal',
+        fixedDim = (size[horz? 'height':'width'] - (horz? marginHeight:marginWidth) - (l -1) * config.barsOffset) / l,
+        animate = config.animate,
+        height = size[horz? 'width':'height'] - (horz? marginWidth:marginHeight) 
+          - (!horz && config.showAggregates && (config.Label.size + config.labelOffset))
+          - (config.showLabels && (config.Label.size + config.labelOffset)),
+        dim1 = horz? 'height':'width',
+        dim2 = horz? 'width':'height';
+    this.st.graph.eachNode(function(n) {
+      var acum = 0, animateValue = [];
+      $.each(n.getData('valueArray'), function(v) {
+        acum += +v;
+        animateValue.push(0);
+      });
+      n.setData(dim1, fixedDim);
+      if(animate) {
+        n.setData(dim2, acum * height / maxValue, 'end');
+        n.setData('dimArray', $.map(n.getData('valueArray'), function(n) { 
+          return n * height / maxValue; 
+        }), 'end');
+        var dimArray = n.getData('dimArray');
+        if(!dimArray) {
+          n.setData('dimArray', animateValue);
+        }
+      } else {
+        n.setData(dim2, acum * height / maxValue);
+        n.setData('dimArray', $.map(n.getData('valueArray'), function(n) { 
+          return n * height / maxValue; 
+        }));
+      }
+    });
+  }
+});
+
+/*
+ * File: Options.PieChart.js
+ *
+*/
+/*
+  Object: Options.PieChart
+  
+  <PieChart> options. 
+  Other options included in the PieChart are <Options.Canvas>, <Options.Label>, <Options.Tips> and <Options.Events>.
+  
+  Syntax:
+  
+  (start code js)
+
+  Options.PieChart = {
+    animate: true,
+    offset: 25,
+    sliceOffset:0,
+    labelOffset: 3,
+    type: 'stacked',
+    hoveredColor: '#9fd4ff',
+    showLabels: true,
+    resizeLabels: false,
+    updateHeights: false
+  };  
+
+  (end code)
+  
+  Example:
+  
+  (start code js)
+
+  var pie = new $jit.PieChart({
+    animate: true,
+    sliceOffset: 5,
+    type: 'stacked:gradient'
+  });  
+
+  (end code)
+  
+  Parameters:
+  
+  animate - (boolean) Default's *true*. Whether to add animated transitions when plotting/updating the visualization.
+  offset - (number) Default's *25*. Adds margin between the visualization and the canvas.
+  sliceOffset - (number) Default's *0*. Separation between the center of the canvas and each pie slice.
+  labelOffset - (number) Default's *3*. Adds margin between the label and the default place where it should be drawn.
+  type - (string) Default's *'stacked'*. Stack style. Posible values are 'stacked', 'stacked:gradient' to add gradients.
+  hoveredColor - (boolean|string) Default's *'#9fd4ff'*. Sets the selected color for a hovered pie stack.
+  showLabels - (boolean) Default's *true*. Display the name of the slots.
+  resizeLabels - (boolean|number) Default's *false*. Resize the pie labels according to their stacked values. Set a number for *resizeLabels* to set a font size minimum.
+  updateHeights - (boolean) Default's *false*. Only for mono-valued (most common) pie charts. Resize the height of the pie slices according to their current values.
+
+*/
+Options.PieChart = {
+  $extend: true,
+
+  animate: true,
+  offset: 25, // page offset
+  sliceOffset:0,
+  labelOffset: 3, // label offset
+  type: 'stacked', // gradient
+  hoveredColor: '#9fd4ff',
+  Events: {
+    enable: false,
+    onClick: $.empty
+  },
+  Tips: {
+    enable: false,
+    onShow: $.empty,
+    onHide: $.empty
+  },
+  showLabels: true,
+  resizeLabels: false,
+  
+  //only valid for mono-valued datasets
+  updateHeights: false
+};
+
+/*
+ * Class: Layouts.Radial
+ * 
+ * Implements a Radial Layout.
+ * 
+ * Implemented By:
+ * 
+ * <RGraph>, <Hypertree>
+ * 
+ */
+Layouts.Radial = new Class({
+
+  /*
+   * Method: compute
+   * 
+   * Computes nodes' positions.
+   * 
+   * Parameters:
+   * 
+   * property - _optional_ A <Graph.Node> position property to store the new
+   * positions. Possible values are 'pos', 'end' or 'start'.
+   * 
+   */
+  compute : function(property) {
+    var prop = $.splat(property || [ 'current', 'start', 'end' ]);
+    NodeDim.compute(this.graph, prop, this.config);
+    this.graph.computeLevels(this.root, 0, "ignore");
+    var lengthFunc = this.createLevelDistanceFunc(); 
+    this.computeAngularWidths(prop);
+    this.computePositions(prop, lengthFunc);
+  },
+
+  /*
+   * computePositions
+   * 
+   * Performs the main algorithm for computing node positions.
+   */
+  computePositions : function(property, getLength) {
+    var propArray = property;
+    var graph = this.graph;
+    var root = graph.getNode(this.root);
+    var parent = this.parent;
+    var config = this.config;
+
+    for ( var i=0, l=propArray.length; i < l; i++) {
+      var pi = propArray[i];
+      root.setPos($P(0, 0), pi);
+      root.setData('span', Math.PI * 2, pi);
+    }
+
+    root.angleSpan = {
+      begin : 0,
+      end : 2 * Math.PI
+    };
+
+    graph.eachBFS(this.root, function(elem) {
+      var angleSpan = elem.angleSpan.end - elem.angleSpan.begin;
+      var angleInit = elem.angleSpan.begin;
+      var len = getLength(elem);
+      //Calculate the sum of all angular widths
+      var totalAngularWidths = 0, subnodes = [], maxDim = {};
+      elem.eachSubnode(function(sib) {
+        totalAngularWidths += sib._treeAngularWidth;
+        //get max dim
+        for ( var i=0, l=propArray.length; i < l; i++) {
+          var pi = propArray[i], dim = sib.getData('dim', pi);
+          maxDim[pi] = (pi in maxDim)? (dim > maxDim[pi]? dim : maxDim[pi]) : dim;
+        }
+        subnodes.push(sib);
+      }, "ignore");
+      //Maintain children order
+      //Second constraint for <http://bailando.sims.berkeley.edu/papers/infovis01.htm>
+      if (parent && parent.id == elem.id && subnodes.length > 0
+          && subnodes[0].dist) {
+        subnodes.sort(function(a, b) {
+          return (a.dist >= b.dist) - (a.dist <= b.dist);
+        });
+      }
+      //Calculate nodes positions.
+      for (var k = 0, ls=subnodes.length; k < ls; k++) {
+        var child = subnodes[k];
+        if (!child._flag) {
+          var angleProportion = child._treeAngularWidth / totalAngularWidths * angleSpan;
+          var theta = angleInit + angleProportion / 2;
+
+          for ( var i=0, l=propArray.length; i < l; i++) {
+            var pi = propArray[i];
+            child.setPos($P(theta, len), pi);
+            child.setData('span', angleProportion, pi);
+            child.setData('dim-quotient', child.getData('dim', pi) / maxDim[pi], pi);
+          }
+
+          child.angleSpan = {
+            begin : angleInit,
+            end : angleInit + angleProportion
+          };
+          angleInit += angleProportion;
+        }
+      }
+    }, "ignore");
+  },
+
+  /*
+   * Method: setAngularWidthForNodes
+   * 
+   * Sets nodes angular widths.
+   */
+  setAngularWidthForNodes : function(prop) {
+    this.graph.eachBFS(this.root, function(elem, i) {
+      var diamValue = elem.getData('angularWidth', prop[0]) || 5;
+      elem._angularWidth = diamValue / i;
+    }, "ignore");
+  },
+
+  /*
+   * Method: setSubtreesAngularWidth
+   * 
+   * Sets subtrees angular widths.
+   */
+  setSubtreesAngularWidth : function() {
+    var that = this;
+    this.graph.eachNode(function(elem) {
+      that.setSubtreeAngularWidth(elem);
+    }, "ignore");
+  },
+
+  /*
+   * Method: setSubtreeAngularWidth
+   * 
+   * Sets the angular width for a subtree.
+   */
+  setSubtreeAngularWidth : function(elem) {
+    var that = this, nodeAW = elem._angularWidth, sumAW = 0;
+    elem.eachSubnode(function(child) {
+      that.setSubtreeAngularWidth(child);
+      sumAW += child._treeAngularWidth;
+    }, "ignore");
+    elem._treeAngularWidth = Math.max(nodeAW, sumAW);
+  },
+
+  /*
+   * Method: computeAngularWidths
+   * 
+   * Computes nodes and subtrees angular widths.
+   */
+  computeAngularWidths : function(prop) {
+    this.setAngularWidthForNodes(prop);
+    this.setSubtreesAngularWidth();
+  }
+
+});
+
+
+/*
+ * File: Sunburst.js
+ */
+
+/*
+   Class: Sunburst
+      
+   A radial space filling tree visualization.
+   
+   Inspired by:
+ 
+   Sunburst <http://www.cc.gatech.edu/gvu/ii/sunburst/>.
+   
+   Note:
+   
+   This visualization was built and engineered from scratch, taking only the paper as inspiration, and only shares some features with the visualization described in the paper.
+   
+  Implements:
+  
+  All <Loader> methods
+  
+   Constructor Options:
+   
+   Inherits options from
+   
+   - <Options.Canvas>
+   - <Options.Controller>
+   - <Options.Node>
+   - <Options.Edge>
+   - <Options.Label>
+   - <Options.Events>
+   - <Options.Tips>
+   - <Options.NodeStyles>
+   - <Options.Navigation>
+   
+   Additionally, there are other parameters and some default values changed
+   
+   interpolation - (string) Default's *linear*. Describes the way nodes are interpolated. Possible values are 'linear' and 'polar'.
+   levelDistance - (number) Default's *100*. The distance between levels of the tree. 
+   Node.type - Described in <Options.Node>. Default's to *multipie*.
+   Node.height - Described in <Options.Node>. Default's *0*.
+   Edge.type - Described in <Options.Edge>. Default's *none*.
+   Label.textAlign - Described in <Options.Label>. Default's *start*.
+   Label.textBaseline - Described in <Options.Label>. Default's *middle*.
+     
+   Instance Properties:
+
+   canvas - Access a <Canvas> instance.
+   graph - Access a <Graph> instance.
+   op - Access a <Sunburst.Op> instance.
+   fx - Access a <Sunburst.Plot> instance.
+   labels - Access a <Sunburst.Label> interface implementation.   
+
+*/
+
+$jit.Sunburst = new Class({
+
+  Implements: [ Loader, Extras, Layouts.Radial ],
+
+  initialize: function(controller) {
+    var $Sunburst = $jit.Sunburst;
+
+    var config = {
+      interpolation: 'linear',
+      levelDistance: 100,
+      Node: {
+        'type': 'multipie',
+        'height':0
+      },
+      Edge: {
+        'type': 'none'
+      },
+      Label: {
+        textAlign: 'start',
+        textBaseline: 'middle'
+      }
+    };
+
+    this.controller = this.config = $.merge(Options("Canvas", "Node", "Edge",
+        "Fx", "Tips", "NodeStyles", "Events", "Navigation", "Controller", "Label"), config, controller);
+
+    var canvasConfig = this.config;
+    if(canvasConfig.useCanvas) {
+      this.canvas = canvasConfig.useCanvas;
+      this.config.labelContainer = this.canvas.id + '-label';
+    } else {
+      if(canvasConfig.background) {
+        canvasConfig.background = $.merge({
+          type: 'Circles'
+        }, canvasConfig.background);
+      }
+      this.canvas = new Canvas(this, canvasConfig);
+      this.config.labelContainer = (typeof canvasConfig.injectInto == 'string'? canvasConfig.injectInto : canvasConfig.injectInto.id) + '-label';
+    }
+
+    this.graphOptions = {
+      'complex': false,
+      'Node': {
+        'selected': false,
+        'exist': true,
+        'drawn': true
+      }
+    };
+    this.graph = new Graph(this.graphOptions, this.config.Node,
+        this.config.Edge);
+    this.labels = new $Sunburst.Label[canvasConfig.Label.type](this);
+    this.fx = new $Sunburst.Plot(this, $Sunburst);
+    this.op = new $Sunburst.Op(this);
+    this.json = null;
+    this.root = null;
+    this.rotated = null;
+    this.busy = false;
+    // initialize extras
+    this.initializeExtras();
+  },
+
+  /* 
+  
+    createLevelDistanceFunc 
+  
+    Returns the levelDistance function used for calculating a node distance 
+    to its origin. This function returns a function that is computed 
+    per level and not per node, such that all nodes with the same depth will have the 
+    same distance to the origin. The resulting function gets the 
+    parent node as parameter and returns a float.
+
+   */
+  createLevelDistanceFunc: function() {
+    var ld = this.config.levelDistance;
+    return function(elem) {
+      return (elem._depth + 1) * ld;
+    };
+  },
+
+  /* 
+     Method: refresh 
+     
+     Computes positions and plots the tree.
+
+   */
+  refresh: function() {
+    this.compute();
+    this.plot();
+  },
+
+  /*
+   reposition
+  
+   An alias for computing new positions to _endPos_
+
+   See also:
+
+   <Sunburst.compute>
+   
+  */
+  reposition: function() {
+    this.compute('end');
+  },
+
+  /*
+  Method: rotate
+  
+  Rotates the graph so that the selected node is horizontal on the right.
+
+  Parameters:
+  
+  node - (object) A <Graph.Node>.
+  method - (string) Whether to perform an animation or just replot the graph. Possible values are "replot" or "animate".
+  opt - (object) Configuration options merged with this visualization configuration options.
+  
+  See also:
+
+  <Sunburst.rotateAngle>
+  
+  */
+  rotate: function(node, method, opt) {
+    var theta = node.getPos(opt.property || 'current').getp(true).theta;
+    this.rotated = node;
+    this.rotateAngle(-theta, method, opt);
+  },
+
+  /*
+  Method: rotateAngle
+  
+  Rotates the graph of an angle theta.
+  
+   Parameters:
+   
+   node - (object) A <Graph.Node>.
+   method - (string) Whether to perform an animation or just replot the graph. Possible values are "replot" or "animate".
+   opt - (object) Configuration options merged with this visualization configuration options.
+   
+   See also:
+
+   <Sunburst.rotate>
+  
+  */
+  rotateAngle: function(theta, method, opt) {
+    var that = this;
+    var options = $.merge(this.config, opt || {}, {
+      modes: [ 'polar' ]
+    });
+    var prop = opt.property || (method === "animate" ? 'end' : 'current');
+    if(method === 'animate') {
+      this.fx.animation.pause();
+    }
+    this.graph.eachNode(function(n) {
+      var p = n.getPos(prop);
+      p.theta += theta;
+      if (p.theta < 0) {
+        p.theta += Math.PI * 2;
+      }
+    });
+    if (method == 'animate') {
+      this.fx.animate(options);
+    } else if (method == 'replot') {
+      this.fx.plot();
+      this.busy = false;
+    }
+  },
+
+  /*
+   Method: plot
+  
+   Plots the Sunburst. This is a shortcut to *fx.plot*.
+  */
+  plot: function() {
+    this.fx.plot();
+  }
+});
+
+$jit.Sunburst.$extend = true;
+
+(function(Sunburst) {
+
+  /*
+     Class: Sunburst.Op
+
+     Custom extension of <Graph.Op>.
+
+     Extends:
+
+     All <Graph.Op> methods
+     
+     See also:
+     
+     <Graph.Op>
+
+  */
+  Sunburst.Op = new Class( {
+
+    Implements: Graph.Op
+
+  });
+
+  /*
+     Class: Sunburst.Plot
+
+    Custom extension of <Graph.Plot>.
+  
+    Extends:
+  
+    All <Graph.Plot> methods
+    
+    See also:
+    
+    <Graph.Plot>
+  
+  */
+  Sunburst.Plot = new Class( {
+
+    Implements: Graph.Plot
+
+  });
+
+  /*
+    Class: Sunburst.Label
+
+    Custom extension of <Graph.Label>. 
+    Contains custom <Graph.Label.SVG>, <Graph.Label.HTML> and <Graph.Label.Native> extensions.
+  
+    Extends:
+  
+    All <Graph.Label> methods and subclasses.
+  
+    See also:
+  
+    <Graph.Label>, <Graph.Label.Native>, <Graph.Label.HTML>, <Graph.Label.SVG>.
+  
+   */
+  Sunburst.Label = {};
+
+  /*
+     Sunburst.Label.Native
+
+     Custom extension of <Graph.Label.Native>.
+
+     Extends:
+
+     All <Graph.Label.Native> methods
+
+     See also:
+
+     <Graph.Label.Native>
+  */
+  Sunburst.Label.Native = new Class( {
+    Implements: Graph.Label.Native,
+
+    initialize: function(viz) {
+      this.viz = viz;
+      this.label = viz.config.Label;
+      this.config = viz.config;
+    },
+
+    renderLabel: function(canvas, node, controller) {
+      var span = node.getData('span');
+      if(span < Math.PI /2 && Math.tan(span) * 
+          this.config.levelDistance * node._depth < 10) {
+        return;
+      }
+      var ctx = canvas.getCtx();
+      var measure = ctx.measureText(node.name);
+      if (node.id == this.viz.root) {
+        var x = -measure.width / 2, y = 0, thetap = 0;
+        var ld = 0;
+      } else {
+        var indent = 5;
+        var ld = controller.levelDistance - indent;
+        var clone = node.pos.clone();
+        clone.rho += indent;
+        var p = clone.getp(true);
+        var ct = clone.getc(true);
+        var x = ct.x, y = ct.y;
+        // get angle in degrees
+        var pi = Math.PI;
+        var cond = (p.theta > pi / 2 && p.theta < 3 * pi / 2);
+        var thetap = cond ? p.theta + pi : p.theta;
+        if (cond) {
+          x -= Math.abs(Math.cos(p.theta) * measure.width);
+          y += Math.sin(p.theta) * measure.width;
+        } else if (node.id == this.viz.root) {
+          x -= measure.width / 2;
+        }
+      }
+      ctx.save();
+      ctx.translate(x, y);
+      ctx.rotate(thetap);
+      ctx.fillText(node.name, 0, 0);
+      ctx.restore();
+    }
+  });
+
+  /*
+     Sunburst.Label.SVG
+
+    Custom extension of <Graph.Label.SVG>.
+  
+    Extends:
+  
+    All <Graph.Label.SVG> methods
+  
+    See also:
+  
+    <Graph.Label.SVG>
+  
+  */
+  Sunburst.Label.SVG = new Class( {
+    Implements: Graph.Label.SVG,
+
+    initialize: function(viz) {
+      this.viz = viz;
+    },
+
+    /* 
+       placeLabel
+
+       Overrides abstract method placeLabel in <Graph.Plot>.
+
+       Parameters:
+
+       tag - A DOM label element.
+       node - A <Graph.Node>.
+       controller - A configuration/controller object passed to the visualization.
+      
+     */
+    placeLabel: function(tag, node, controller) {
+      var pos = node.pos.getc(true), viz = this.viz, canvas = this.viz.canvas;
+      var radius = canvas.getSize();
+      var labelPos = {
+        x: Math.round(pos.x + radius.width / 2),
+        y: Math.round(pos.y + radius.height / 2)
+      };
+      tag.setAttribute('x', labelPos.x);
+      tag.setAttribute('y', labelPos.y);
+
+      var bb = tag.getBBox();
+      if (bb) {
+        // center the label
+    var x = tag.getAttribute('x');
+    var y = tag.getAttribute('y');
+    // get polar coordinates
+    var p = node.pos.getp(true);
+    // get angle in degrees
+    var pi = Math.PI;
+    var cond = (p.theta > pi / 2 && p.theta < 3 * pi / 2);
+    if (cond) {
+      tag.setAttribute('x', x - bb.width);
+      tag.setAttribute('y', y - bb.height);
+    } else if (node.id == viz.root) {
+      tag.setAttribute('x', x - bb.width / 2);
+    }
+
+    var thetap = cond ? p.theta + pi : p.theta;
+    if(node._depth)
+      tag.setAttribute('transform', 'rotate(' + thetap * 360 / (2 * pi) + ' ' + x
+          + ' ' + y + ')');
+  }
+
+  controller.onPlaceLabel(tag, node);
+}
+  });
+
+  /*
+     Sunburst.Label.HTML
+
+     Custom extension of <Graph.Label.HTML>.
+
+     Extends:
+
+     All <Graph.Label.HTML> methods.
+
+     See also:
+
+     <Graph.Label.HTML>
+
+  */
+  Sunburst.Label.HTML = new Class( {
+    Implements: Graph.Label.HTML,
+
+    initialize: function(viz) {
+      this.viz = viz;
+    },
+    /* 
+       placeLabel
+
+       Overrides abstract method placeLabel in <Graph.Plot>.
+
+       Parameters:
+
+       tag - A DOM label element.
+       node - A <Graph.Node>.
+       controller - A configuration/controller object passed to the visualization.
+      
+     */
+    placeLabel: function(tag, node, controller) {
+      var pos = node.pos.clone(), 
+          canvas = this.viz.canvas,
+          height = node.getData('height'),
+          ldist = ((height || node._depth == 0)? height : this.viz.config.levelDistance) /2,
+          radius = canvas.getSize();
+      pos.rho += ldist;
+      pos = pos.getc(true);
+      
+      var labelPos = {
+        x: Math.round(pos.x + radius.width / 2),
+        y: Math.round(pos.y + radius.height / 2)
+      };
+
+      var style = tag.style;
+      style.left = labelPos.x + 'px';
+      style.top = labelPos.y + 'px';
+      style.display = this.fitsInCanvas(labelPos, canvas) ? '' : 'none';
+
+      controller.onPlaceLabel(tag, node);
+    }
+  });
+
+  /*
+    Class: Sunburst.Plot.NodeTypes
+
+    This class contains a list of <Graph.Node> built-in types. 
+    Node types implemented are 'none', 'pie', 'multipie', 'gradient-pie' and 'gradient-multipie'.
+
+    You can add your custom node types, customizing your visualization to the extreme.
+
+    Example:
+
+    (start code js)
+      Sunburst.Plot.NodeTypes.implement({
+        'mySpecialType': {
+          'render': function(node, canvas) {
+            //print your custom node to canvas
+          },
+          //optional
+          'contains': function(node, pos) {
+            //return true if pos is inside the node or false otherwise
+          }
+        }
+      });
+    (end code)
+
+  */
+  Sunburst.Plot.NodeTypes = new Class( {
+    'none': {
+      'render': $.empty,
+      'contains': $.lambda(false),
+      'anglecontains': function(node, pos) {
+        var span = node.getData('span') / 2, theta = node.pos.theta;
+        var begin = theta - span, end = theta + span;
+        if (begin < 0)
+          begin += Math.PI * 2;
+        var atan = Math.atan2(pos.y, pos.x);
+        if (atan < 0)
+          atan += Math.PI * 2;
+        if (begin > end) {
+          return (atan > begin && atan <= Math.PI * 2) || atan < end;
+        } else {
+          return atan > begin && atan < end;
+        }
+      }
+    },
+
+    'pie': {
+      'render': function(node, canvas) {
+        var span = node.getData('span') / 2, theta = node.pos.theta;
+        var begin = theta - span, end = theta + span;
+        var polarNode = node.pos.getp(true);
+        var polar = new Polar(polarNode.rho, begin);
+        var p1coord = polar.getc(true);
+        polar.theta = end;
+        var p2coord = polar.getc(true);
+
+        var ctx = canvas.getCtx();
+        ctx.beginPath();
+        ctx.moveTo(0, 0);
+        ctx.lineTo(p1coord.x, p1coord.y);
+        ctx.moveTo(0, 0);
+        ctx.lineTo(p2coord.x, p2coord.y);
+        ctx.moveTo(0, 0);
+        ctx.arc(0, 0, polarNode.rho * node.getData('dim-quotient'), begin, end,
+            false);
+        ctx.fill();
+      },
+      'contains': function(node, pos) {
+        if (this.nodeTypes['none'].anglecontains.call(this, node, pos)) {
+          var rho = Math.sqrt(pos.x * pos.x + pos.y * pos.y);
+          var ld = this.config.levelDistance, d = node._depth;
+          return (rho <= ld * d);
+        }
+        return false;
+      }
+    },
+    'multipie': {
+      'render': function(node, canvas) {
+        var height = node.getData('height');
+        var ldist = height? height : this.config.levelDistance;
+        var span = node.getData('span') / 2, theta = node.pos.theta;
+        var begin = theta - span, end = theta + span;
+        var polarNode = node.pos.getp(true);
+
+        var polar = new Polar(polarNode.rho, begin);
+        var p1coord = polar.getc(true);
+
+        polar.theta = end;
+        var p2coord = polar.getc(true);
+
+        polar.rho += ldist;
+        var p3coord = polar.getc(true);
+
+        polar.theta = begin;
+        var p4coord = polar.getc(true);
+
+        var ctx = canvas.getCtx();
+        ctx.moveTo(0, 0);
+        ctx.beginPath();
+        ctx.arc(0, 0, polarNode.rho, begin, end, false);
+        ctx.arc(0, 0, polarNode.rho + ldist, end, begin, true);
+        ctx.moveTo(p1coord.x, p1coord.y);
+        ctx.lineTo(p4coord.x, p4coord.y);
+        ctx.moveTo(p2coord.x, p2coord.y);
+        ctx.lineTo(p3coord.x, p3coord.y);
+        ctx.fill();
+
+        if (node.collapsed) {
+          ctx.save();
+          ctx.lineWidth = 2;
+          ctx.moveTo(0, 0);
+          ctx.beginPath();
+          ctx.arc(0, 0, polarNode.rho + ldist + 5, end - 0.01, begin + 0.01,
+              true);
+          ctx.stroke();
+          ctx.restore();
+        }
+      },
+      'contains': function(node, pos) {
+        if (this.nodeTypes['none'].anglecontains.call(this, node, pos)) {
+          var rho = Math.sqrt(pos.x * pos.x + pos.y * pos.y);
+          var height = node.getData('height');
+          var ldist = height? height : this.config.levelDistance;
+          var ld = this.config.levelDistance, d = node._depth;
+          return (rho >= ld * d) && (rho <= (ld * d + ldist));
+        }
+        return false;
+      }
+    },
+
+    'gradient-multipie': {
+      'render': function(node, canvas) {
+        var ctx = canvas.getCtx();
+        var height = node.getData('height');
+        var ldist = height? height : this.config.levelDistance;
+        var radialGradient = ctx.createRadialGradient(0, 0, node.getPos().rho,
+            0, 0, node.getPos().rho + ldist);
+
+        var colorArray = $.hexToRgb(node.getData('color')), ans = [];
+        $.each(colorArray, function(i) {
+          ans.push(parseInt(i * 0.5, 10));
+        });
+        var endColor = $.rgbToHex(ans);
+        radialGradient.addColorStop(0, endColor);
+        radialGradient.addColorStop(1, node.getData('color'));
+        ctx.fillStyle = radialGradient;
+        this.nodeTypes['multipie'].render.call(this, node, canvas);
+      },
+      'contains': function(node, pos) {
+        return this.nodeTypes['multipie'].contains.call(this, node, pos);
+      }
+    },
+
+    'gradient-pie': {
+      'render': function(node, canvas) {
+        var ctx = canvas.getCtx();
+        var radialGradient = ctx.createRadialGradient(0, 0, 0, 0, 0, node
+            .getPos().rho);
+
+        var colorArray = $.hexToRgb(node.getData('color')), ans = [];
+        $.each(colorArray, function(i) {
+          ans.push(parseInt(i * 0.5, 10));
+        });
+        var endColor = $.rgbToHex(ans);
+        radialGradient.addColorStop(1, endColor);
+        radialGradient.addColorStop(0, node.getData('color'));
+        ctx.fillStyle = radialGradient;
+        this.nodeTypes['pie'].render.call(this, node, canvas);
+      },
+      'contains': function(node, pos) {
+        return this.nodeTypes['pie'].contains.call(this, node, pos);
+      }
+    }
+  });
+
+  /*
+    Class: Sunburst.Plot.EdgeTypes
+
+    This class contains a list of <Graph.Adjacence> built-in types. 
+    Edge types implemented are 'none', 'line' and 'arrow'.
+  
+    You can add your custom edge types, customizing your visualization to the extreme.
+  
+    Example:
+  
+    (start code js)
+      Sunburst.Plot.EdgeTypes.implement({
+        'mySpecialType': {
+          'render': function(adj, canvas) {
+            //print your custom edge to canvas
+          },
+          //optional
+          'contains': function(adj, pos) {
+            //return true if pos is inside the arc or false otherwise
+          }
+        }
+      });
+    (end code)
+  
+  */
+  Sunburst.Plot.EdgeTypes = new Class({
+    'none': $.empty,
+    'line': {
+      'render': function(adj, canvas) {
+        var from = adj.nodeFrom.pos.getc(true),
+            to = adj.nodeTo.pos.getc(true);
+        this.edgeHelper.line.render(from, to, canvas);
+      },
+      'contains': function(adj, pos) {
+        var from = adj.nodeFrom.pos.getc(true),
+            to = adj.nodeTo.pos.getc(true);
+        return this.edgeHelper.line.contains(from, to, pos, this.edge.epsilon);
+      }
+    },
+    'arrow': {
+      'render': function(adj, canvas) {
+        var from = adj.nodeFrom.pos.getc(true),
+            to = adj.nodeTo.pos.getc(true),
+            dim = adj.getData('dim'),
+            direction = adj.data.$direction,
+            inv = (direction && direction.length>1 && direction[0] != adj.nodeFrom.id);
+        this.edgeHelper.arrow.render(from, to, dim, inv, canvas);
+      },
+      'contains': function(adj, pos) {
+        var from = adj.nodeFrom.pos.getc(true),
+            to = adj.nodeTo.pos.getc(true);
+        return this.edgeHelper.arrow.contains(from, to, pos, this.edge.epsilon);
+      }
+    },
+    'hyperline': {
+      'render': function(adj, canvas) {
+        var from = adj.nodeFrom.pos.getc(),
+            to = adj.nodeTo.pos.getc(),
+            dim = Math.max(from.norm(), to.norm());
+        this.edgeHelper.hyperline.render(from.$scale(1/dim), to.$scale(1/dim), dim, canvas);
+      },
+      'contains': $.lambda(false) //TODO(nico): Implement this!
+    }
+  });
+
+})($jit.Sunburst);
+
+
+/*
+ * File: PieChart.js
+ *
+*/
+
+$jit.Sunburst.Plot.NodeTypes.implement({
+  'piechart-stacked' : {
+    'render' : function(node, canvas) {
+      var pos = node.pos.getp(true),
+          dimArray = node.getData('dimArray'),
+          valueArray = node.getData('valueArray'),
+          colorArray = node.getData('colorArray'),
+          colorLength = colorArray.length,
+          stringArray = node.getData('stringArray'),
+          span = node.getData('span') / 2,
+          theta = node.pos.theta,
+          begin = theta - span,
+          end = theta + span,
+          polar = new Polar;
+    
+      var ctx = canvas.getCtx(), 
+          opt = {},
+          gradient = node.getData('gradient'),
+          border = node.getData('border'),
+          config = node.getData('config'),
+          showLabels = config.showLabels,
+          resizeLabels = config.resizeLabels,
+          label = config.Label;
+
+      var xpos = config.sliceOffset * Math.cos((begin + end) /2);
+      var ypos = config.sliceOffset * Math.sin((begin + end) /2);
+
+      if (colorArray && dimArray && stringArray) {
+        for (var i=0, l=dimArray.length, acum=0, valAcum=0; i<l; i++) {
+          var dimi = dimArray[i], colori = colorArray[i % colorLength];
+          if(dimi <= 0) continue;
+          ctx.fillStyle = ctx.strokeStyle = colori;
+          if(gradient && dimi) {
+            var radialGradient = ctx.createRadialGradient(xpos, ypos, acum + config.sliceOffset,
+                xpos, ypos, acum + dimi + config.sliceOffset);
+            var colorRgb = $.hexToRgb(colori), 
+                ans = $.map(colorRgb, function(i) { return (i * 0.8) >> 0; }),
+                endColor = $.rgbToHex(ans);
+
+            radialGradient.addColorStop(0, colori);
+            radialGradient.addColorStop(0.5, colori);
+            radialGradient.addColorStop(1, endColor);
+            ctx.fillStyle = radialGradient;
+          }
+          
+          polar.rho = acum + config.sliceOffset;
+          polar.theta = begin;
+          var p1coord = polar.getc(true);
+          polar.theta = end;
+          var p2coord = polar.getc(true);
+          polar.rho += dimi;
+          var p3coord = polar.getc(true);
+          polar.theta = begin;
+          var p4coord = polar.getc(true);
+
+          ctx.beginPath();
+          //fixing FF arc method + fill
+          ctx.arc(xpos, ypos, acum + .01, begin, end, false);
+          ctx.arc(xpos, ypos, acum + dimi + .01, end, begin, true);
+          ctx.fill();
+          if(border && border.name == stringArray[i]) {
+            opt.acum = acum;
+            opt.dimValue = dimArray[i];
+            opt.begin = begin;
+            opt.end = end;
+          }
+          acum += (dimi || 0);
+          valAcum += (valueArray[i] || 0);
+        }
+        if(border) {
+          ctx.save();
+          ctx.globalCompositeOperation = "source-over";
+          ctx.lineWidth = 2;
+          ctx.strokeStyle = border.color;
+          var s = begin < end? 1 : -1;
+          ctx.beginPath();
+          //fixing FF arc method + fill
+          ctx.arc(xpos, ypos, opt.acum + .01 + 1, opt.begin, opt.end, false);
+          ctx.arc(xpos, ypos, opt.acum + opt.dimValue + .01 - 1, opt.end, opt.begin, true);
+          ctx.closePath();
+          ctx.stroke();
+          ctx.restore();
+        }
+        if(showLabels && label.type == 'Native') {
+          ctx.save();
+          ctx.fillStyle = ctx.strokeStyle = label.color;
+          var scale = resizeLabels? node.getData('normalizedDim') : 1,
+              fontSize = (label.size * scale) >> 0;
+          fontSize = fontSize < +resizeLabels? +resizeLabels : fontSize;
+          
+          ctx.font = label.style + ' ' + fontSize + 'px ' + label.family;
+          ctx.textBaseline = 'middle';
+          ctx.textAlign = 'center';
+          
+          polar.rho = acum + config.labelOffset + config.sliceOffset;
+          polar.theta = node.pos.theta;
+          var cart = polar.getc(true);
+          
+          ctx.fillText(node.name, cart.x, cart.y);
+          ctx.restore();
+        }
+      }
+    },
+    'contains': function(node, pos) {
+      if (this.nodeTypes['none'].anglecontains.call(this, node, pos)) {
+        var rho = Math.sqrt(pos.x * pos.x + pos.y * pos.y);
+        var ld = this.config.levelDistance, d = node._depth;
+        var config = node.getData('config');
+        if(rho <=ld * d + config.sliceOffset) {
+          var dimArray = node.getData('dimArray');
+          for(var i=0,l=dimArray.length,acum=config.sliceOffset; i<l; i++) {
+            var dimi = dimArray[i];
+            if(rho >= acum && rho <= acum + dimi) {
+              return {
+                name: node.getData('stringArray')[i],
+                color: node.getData('colorArray')[i],
+                value: node.getData('valueArray')[i],
+                label: node.name
+              };
+            }
+            acum += dimi;
+          }
+        }
+        return false;
+        
+      }
+      return false;
+    }
+  }
+});
+
+/*
+  Class: PieChart
+  
+  A visualization that displays stacked bar charts.
+  
+  Constructor Options:
+  
+  See <Options.PieChart>.
+
+*/
+$jit.PieChart = new Class({
+  sb: null,
+  colors: ["#416D9C", "#70A35E", "#EBB056", "#C74243", "#83548B", "#909291", "#557EAA"],
+  selected: {},
+  busy: false,
+  
+  initialize: function(opt) {
+    this.controller = this.config = 
+      $.merge(Options("Canvas", "PieChart", "Label"), {
+        Label: { type: 'Native' }
+      }, opt);
+    this.initializeViz();
+  },
+  
+  initializeViz: function() {
+    var config = this.config, that = this;
+    var nodeType = config.type.split(":")[0];
+    var sb = new $jit.Sunburst({
+      injectInto: config.injectInto,
+      useCanvas: config.useCanvas,
+      withLabels: config.Label.type != 'Native',
+      Label: {
+        type: config.Label.type
+      },
+      Node: {
+        overridable: true,
+        type: 'piechart-' + nodeType,
+        width: 1,
+        height: 1
+      },
+      Edge: {
+        type: 'none'
+      },
+      Tips: {
+        enable: config.Tips.enable,
+        type: 'Native',
+        force: true,
+        onShow: function(tip, node, contains) {
+          var elem = contains;
+          config.Tips.onShow(tip, elem, node);
+        }
+      },
+      Events: {
+        enable: true,
+        type: 'Native',
+        onClick: function(node, eventInfo, evt) {
+          if(!config.Events.enable) return;
+          var elem = eventInfo.getContains();
+          config.Events.onClick(elem, eventInfo, evt);
+        },
+        onMouseMove: function(node, eventInfo, evt) {
+          if(!config.hoveredColor) return;
+          if(node) {
+            var elem = eventInfo.getContains();
+            that.select(node.id, elem.name, elem.index);
+          } else {
+            that.select(false, false, false);
+          }
+        }
+      },
+      onCreateLabel: function(domElement, node) {
+        var labelConf = config.Label;
+        if(config.showLabels) {
+          var style = domElement.style;
+          style.fontSize = labelConf.size + 'px';
+          style.fontFamily = labelConf.family;
+          style.color = labelConf.color;
+          style.textAlign = 'center';
+          domElement.innerHTML = node.name;
+        }
+      },
+      onPlaceLabel: function(domElement, node) {
+        if(!config.showLabels) return;
+        var pos = node.pos.getp(true),
+            dimArray = node.getData('dimArray'),
+            span = node.getData('span') / 2,
+            theta = node.pos.theta,
+            begin = theta - span,
+            end = theta + span,
+            polar = new Polar;
+      
+        var showLabels = config.showLabels,
+            resizeLabels = config.resizeLabels,
+            label = config.Label;
+        
+        if (dimArray) {
+          for (var i=0, l=dimArray.length, acum=0; i<l; i++) {
+            acum += dimArray[i];
+          }
+          var scale = resizeLabels? node.getData('normalizedDim') : 1,
+              fontSize = (label.size * scale) >> 0;
+          fontSize = fontSize < +resizeLabels? +resizeLabels : fontSize;
+          domElement.style.fontSize = fontSize + 'px';
+          polar.rho = acum + config.labelOffset + config.sliceOffset;
+          polar.theta = (begin + end) / 2;
+          var pos = polar.getc(true);
+          var radius = that.canvas.getSize();
+          var labelPos = {
+            x: Math.round(pos.x + radius.width / 2),
+            y: Math.round(pos.y + radius.height / 2)
+          };
+          domElement.style.left = labelPos.x + 'px';
+          domElement.style.top = labelPos.y + 'px';
+        }
+      }
+    });
+    
+    var size = sb.canvas.getSize(),
+        min = Math.min;
+    sb.config.levelDistance = min(size.width, size.height)/2 
+      - config.offset - config.sliceOffset;
+    this.sb = sb;
+    this.canvas = this.sb.canvas;
+    this.canvas.getCtx().globalCompositeOperation = 'lighter';
+  },
+  
+  /*
+    Method: loadJSON
+   
+    Loads JSON data into the visualization. 
+    
+    Parameters:
+    
+    json - The JSON data format. This format is described in <http://blog.thejit.org/2010/04/24/new-javascript-infovis-toolkit-visualizations/#json-data-format>.
+    
+    Example:
+    (start code js)
+    var pieChart = new $jit.PieChart(options);
+    pieChart.loadJSON(json);
+    (end code)
+  */  
+  loadJSON: function(json) {
+    var prefix = $.time(), 
+        ch = [], 
+        sb = this.sb,
+        name = $.splat(json.label),
+        nameLength = name.length,
+        color = $.splat(json.color || this.colors),
+        colorLength = color.length,
+        config = this.config,
+        gradient = !!config.type.split(":")[1],
+        animate = config.animate,
+        mono = nameLength == 1;
+    
+    for(var i=0, values=json.values, l=values.length; i<l; i++) {
+      var val = values[i];
+      var valArray = $.splat(val.values);
+      ch.push({
+        'id': prefix + val.label,
+        'name': val.label,
+        'data': {
+          'value': valArray,
+          '$valueArray': valArray,
+          '$colorArray': mono? $.splat(color[i % colorLength]) : color,
+          '$stringArray': name,
+          '$gradient': gradient,
+          '$config': config,
+          '$angularWidth': $.reduce(valArray, function(x,y){return x+y;})
+        },
+        'children': []
+      });
+    }
+    var root = {
+      'id': prefix + '$root',
+      'name': '',
+      'data': {
+        '$type': 'none',
+        '$width': 1,
+        '$height': 1
+      },
+      'children': ch
+    };
+    sb.loadJSON(root);
+    
+    this.normalizeDims();
+    sb.refresh();
+    if(animate) {
+      sb.fx.animate({
+        modes: ['node-property:dimArray'],
+        duration:1500
+      });
+    }
+  },
+  
+  /*
+    Method: updateJSON
+   
+    Use this method when updating values for the current JSON data. If the items specified by the JSON data already exist in the graph then their values will be updated.
+    
+    Parameters:
+    
+    json - (object) JSON data to be updated. The JSON format corresponds to the one described in <PieChart.loadJSON>.
+    onComplete - (object) A callback object to be called when the animation transition when updating the data end.
+    
+    Example:
+    
+    (start code js)
+    pieChart.updateJSON(json, {
+      onComplete: function() {
+        alert('update complete!');
+      }
+    });
+    (end code)
+  */  
+  updateJSON: function(json, onComplete) {
+    if(this.busy) return;
+    this.busy = true;
+    
+    var sb = this.sb;
+    var graph = sb.graph;
+    var values = json.values;
+    var animate = this.config.animate;
+    var that = this;
+    $.each(values, function(v) {
+      var n = graph.getByName(v.label),
+          vals = $.splat(v.values);
+      if(n) {
+        n.setData('valueArray', vals);
+        n.setData('angularWidth', $.reduce(vals, function(x,y){return x+y;}));
+        if(json.label) {
+          n.setData('stringArray', $.splat(json.label));
+        }
+      }
+    });
+    this.normalizeDims();
+    if(animate) {
+      sb.compute('end');
+      sb.fx.animate({
+        modes: ['node-property:dimArray:span', 'linear'],
+        duration:1500,
+        onComplete: function() {
+          that.busy = false;
+          onComplete && onComplete.onComplete();
+        }
+      });
+    } else {
+      sb.refresh();
+    }
+  },
+    
+  //adds the little brown bar when hovering the node
+  select: function(id, name) {
+    if(!this.config.hoveredColor) return;
+    var s = this.selected;
+    if(s.id != id || s.name != name) {
+      s.id = id;
+      s.name = name;
+      s.color = this.config.hoveredColor;
+      this.sb.graph.eachNode(function(n) {
+        if(id == n.id) {
+          n.setData('border', s);
+        } else {
+          n.setData('border', false);
+        }
+      });
+      this.sb.plot();
+    }
+  },
+  
+  /*
+    Method: getLegend
+   
+    Returns an object containing as keys the legend names and as values hex strings with color values.
+    
+    Example:
+    
+    (start code js)
+    var legend = pieChart.getLegend();
+    (end code)
+  */  
+  getLegend: function() {
+    var legend = {};
+    var n;
+    this.sb.graph.getNode(this.sb.root).eachAdjacency(function(adj) {
+      n = adj.nodeTo;
+    });
+    var colors = n.getData('colorArray'),
+        len = colors.length;
+    $.each(n.getData('stringArray'), function(s, i) {
+      legend[s] = colors[i % len];
+    });
+    return legend;
+  },
+  
+  /*
+    Method: getMaxValue
+   
+    Returns the maximum accumulated value for the stacks. This method is used for normalizing the graph heights according to the canvas height.
+    
+    Example:
+    
+    (start code js)
+    var ans = pieChart.getMaxValue();
+    (end code)
+    
+    In some cases it could be useful to override this method to normalize heights for a group of PieCharts, like when doing small multiples.
+    
+    Example:
+    
+    (start code js)
+    //will return 100 for all PieChart instances,
+    //displaying all of them with the same scale
+    $jit.PieChart.implement({
+      'getMaxValue': function() {
+        return 100;
+      }
+    });
+    (end code)
+    
+  */  
+  getMaxValue: function() {
+    var maxValue = 0;
+    this.sb.graph.eachNode(function(n) {
+      var valArray = n.getData('valueArray'),
+          acum = 0;
+      $.each(valArray, function(v) { 
+        acum += +v;
+      });
+      maxValue = maxValue>acum? maxValue:acum;
+    });
+    return maxValue;
+  },
+  
+  normalizeDims: function() {
+    //number of elements
+    var root = this.sb.graph.getNode(this.sb.root), l=0;
+    root.eachAdjacency(function() {
+      l++;
+    });
+    var maxValue = this.getMaxValue() || 1,
+        config = this.config,
+        animate = config.animate,
+        rho = this.sb.config.levelDistance;
+    this.sb.graph.eachNode(function(n) {
+      var acum = 0, animateValue = [];
+      $.each(n.getData('valueArray'), function(v) {
+        acum += +v;
+        animateValue.push(1);
+      });
+      var stat = (animateValue.length == 1) && !config.updateHeights;
+      if(animate) {
+        n.setData('dimArray', $.map(n.getData('valueArray'), function(n) { 
+          return stat? rho: (n * rho / maxValue); 
+        }), 'end');
+        var dimArray = n.getData('dimArray');
+        if(!dimArray) {
+          n.setData('dimArray', animateValue);
+        }
+      } else {
+        n.setData('dimArray', $.map(n.getData('valueArray'), function(n) { 
+          return stat? rho : (n * rho / maxValue); 
+        }));
+      }
+      n.setData('normalizedDim', acum / maxValue);
+    });
+  }
+});
+
+/*
+ * Class: Layouts.TM
+ * 
+ * Implements TreeMaps layouts (SliceAndDice, Squarified, Strip).
+ * 
+ * Implemented By:
+ * 
+ * <TM>
+ * 
+ */
+Layouts.TM = {};
+
+Layouts.TM.SliceAndDice = new Class({
+  compute: function(prop) {
+    var root = this.graph.getNode(this.clickedNode && this.clickedNode.id || this.root);
+    this.controller.onBeforeCompute(root);
+    var size = this.canvas.getSize(),
+        config = this.config,
+        width = size.width,
+        height = size.height;
+    this.graph.computeLevels(this.root, 0, "ignore");
+    //set root position and dimensions
+    root.getPos(prop).setc(-width/2, -height/2);
+    root.setData('width', width, prop);
+    root.setData('height', height + config.titleHeight, prop);
+    this.computePositions(root, root, this.layout.orientation, prop);
+    this.controller.onAfterCompute(root);
+  },
+  
+  computePositions: function(par, ch, orn, prop) {
+    //compute children areas
+    var totalArea = 0;
+    par.eachSubnode(function(n) {
+      totalArea += n.getData('area', prop);
+    });
+    
+    var config = this.config,
+        offst = config.offset,
+        width  = par.getData('width', prop),
+        height = par.getData('height', prop) - config.titleHeight,
+        fact = par == ch? 1: (ch.getData('area', prop) / totalArea);
+    
+    var otherSize, size, dim, pos, pos2, posth, pos2th;
+    var horizontal = (orn == "h");
+    if(horizontal) {
+      orn = 'v';    
+      otherSize = height;
+      size = width * fact;
+      dim = 'height';
+      pos = 'y';
+      pos2 = 'x';
+      posth = config.titleHeight;
+      pos2th = 0;
+    } else {
+      orn = 'h';    
+      otherSize = height * fact;
+      size = width;
+      dim = 'width';
+      pos = 'x';
+      pos2 = 'y';
+      posth = 0;
+      pos2th = config.titleHeight;
+    }
+    var cpos = ch.getPos(prop);
+    ch.setData('width', size, prop);
+    ch.setData('height', otherSize, prop);
+    var offsetSize = 0, tm = this;
+    ch.eachSubnode(function(n) {
+      var p = n.getPos(prop);
+      p[pos] = offsetSize + cpos[pos] + posth;
+      p[pos2] = cpos[pos2] + pos2th;
+      tm.computePositions(ch, n, orn, prop);
+      offsetSize += n.getData(dim, prop);
+    });
+  }
+
+});
+
+Layouts.TM.Area = {
+ /*
+    Method: compute
+ 
+   Called by loadJSON to calculate recursively all node positions and lay out the tree.
+ 
+    Parameters:
+
+       json - A JSON tree. See also <Loader.loadJSON>.
+       coord - A coordinates object specifying width, height, left and top style properties.
+ */
+ compute: function(prop) {
+    prop = prop || "current";
+    var root = this.graph.getNode(this.clickedNode && this.clickedNode.id || this.root);
+    this.controller.onBeforeCompute(root);
+    var config = this.config,
+        size = this.canvas.getSize(),
+        width = size.width,
+        height = size.height,
+        offst = config.offset,
+        offwdth = width - offst,
+        offhght = height - offst;
+    this.graph.computeLevels(this.root, 0, "ignore");
+    //set root position and dimensions
+    root.getPos(prop).setc(-width/2, -height/2);
+    root.setData('width', width, prop);
+    root.setData('height', height, prop);
+    //create a coordinates object
+    var coord = {
+        'top': -height/2 + config.titleHeight,
+        'left': -width/2,
+        'width': offwdth,
+        'height': offhght - config.titleHeight
+    };
+    this.computePositions(root, coord, prop);
+    this.controller.onAfterCompute(root);
+ }, 
+ 
+ /*
+    Method: computeDim
+ 
+   Computes dimensions and positions of a group of nodes
+   according to a custom layout row condition. 
+ 
+    Parameters:
+
+       tail - An array of nodes.  
+       initElem - An array of nodes (containing the initial node to be laid).
+       w - A fixed dimension where nodes will be layed out.
+       coord - A coordinates object specifying width, height, left and top style properties.
+       comp - A custom comparison function
+ */
+ computeDim: function(tail, initElem, w, coord, comp, prop) {
+   if(tail.length + initElem.length == 1) {
+     var l = (tail.length == 1)? tail : initElem;
+     this.layoutLast(l, w, coord, prop);
+     return;
+   }
+   if(tail.length >= 2 && initElem.length == 0) {
+     initElem = [tail.shift()];
+   }
+   if(tail.length == 0) {
+     if(initElem.length > 0) this.layoutRow(initElem, w, coord, prop);
+     return;
+   }
+   var c = tail[0];
+   if(comp(initElem, w) >= comp([c].concat(initElem), w)) {
+     this.computeDim(tail.slice(1), initElem.concat([c]), w, coord, comp, prop);
+   } else {
+     var newCoords = this.layoutRow(initElem, w, coord, prop);
+     this.computeDim(tail, [], newCoords.dim, newCoords, comp, prop);
+   }
+ },
+
+ 
+ /*
+    Method: worstAspectRatio
+ 
+   Calculates the worst aspect ratio of a group of rectangles. 
+       
+    See also:
+       
+       <http://en.wikipedia.org/wiki/Aspect_ratio>
+   
+    Parameters:
+
+     ch - An array of nodes.  
+     w  - The fixed dimension where rectangles are being laid out.
+
+    Returns:
+ 
+        The worst aspect ratio.
+
+
+ */
+ worstAspectRatio: function(ch, w) {
+   if(!ch || ch.length == 0) return Number.MAX_VALUE;
+   var areaSum = 0, maxArea = 0, minArea = Number.MAX_VALUE;
+   for(var i=0, l=ch.length; i<l; i++) {
+     var area = ch[i]._area;
+     areaSum += area; 
+     minArea = minArea < area? minArea : area;
+     maxArea = maxArea > area? maxArea : area; 
+   }
+   var sqw = w * w, sqAreaSum = areaSum * areaSum;
+   return Math.max(sqw * maxArea / sqAreaSum,
+           sqAreaSum / (sqw * minArea));
+ },
+ 
+ /*
+    Method: avgAspectRatio
+ 
+   Calculates the average aspect ratio of a group of rectangles. 
+       
+       See also:
+       
+       <http://en.wikipedia.org/wiki/Aspect_ratio>
+   
+    Parameters:
+
+     ch - An array of nodes.  
+       w - The fixed dimension where rectangles are being laid out.
+
+    Returns:
+ 
+        The average aspect ratio.
+
+
+ */
+ avgAspectRatio: function(ch, w) {
+   if(!ch || ch.length == 0) return Number.MAX_VALUE;
+   var arSum = 0;
+   for(var i=0, l=ch.length; i<l; i++) {
+     var area = ch[i]._area;
+     var h = area / w;
+     arSum += w > h? w / h : h / w;
+   }
+   return arSum / l;
+ },
+
+ /*
+    layoutLast
+ 
+   Performs the layout of the last computed sibling.
+ 
+    Parameters:
+
+       ch - An array of nodes.  
+       w - A fixed dimension where nodes will be layed out.
+     coord - A coordinates object specifying width, height, left and top style properties.
+ */
+ layoutLast: function(ch, w, coord, prop) {
+   var child = ch[0];
+   child.getPos(prop).setc(coord.left, coord.top);
+   child.setData('width', coord.width, prop);
+   child.setData('height', coord.height, prop);
+ }
+};
+
+
+Layouts.TM.Squarified = new Class({
+ Implements: Layouts.TM.Area,
+ 
+ computePositions: function(node, coord, prop) {
+   var config = this.config;
+   
+   if (coord.width >= coord.height) 
+     this.layout.orientation = 'h';
+   else
+     this.layout.orientation = 'v';
+   
+   var ch = node.getSubnodes([1, 1], "ignore");
+   if(ch.length > 0) {
+     this.processChildrenLayout(node, ch, coord, prop);
+     for(var i=0, l=ch.length; i<l; i++) {
+       var chi = ch[i]; 
+       var offst = config.offset,
+           height = chi.getData('height', prop) - offst - config.titleHeight,
+           width = chi.getData('width', prop) - offst;
+       var chipos = chi.getPos(prop);
+       coord = {
+         'width': width,
+         'height': height,
+         'top': chipos.y + config.titleHeight,
+         'left': chipos.x
+       };
+       this.computePositions(chi, coord, prop);
+     }
+   }
+ },
+
+ /*
+    Method: processChildrenLayout
+ 
+   Computes children real areas and other useful parameters for performing the Squarified algorithm.
+ 
+    Parameters:
+
+       par - The parent node of the json subtree.  
+       ch - An Array of nodes
+     coord - A coordinates object specifying width, height, left and top style properties.
+ */
+ processChildrenLayout: function(par, ch, coord, prop) {
+   //compute children real areas
+   var parentArea = coord.width * coord.height;
+   var i, l=ch.length, totalChArea=0, chArea = [];
+   for(i=0; i<l; i++) {
+     chArea[i] = parseFloat(ch[i].getData('area', prop));
+     totalChArea += chArea[i];
+   }
+   for(i=0; i<l; i++) {
+     ch[i]._area = parentArea * chArea[i] / totalChArea;
+   }
+   var minimumSideValue = this.layout.horizontal()? coord.height : coord.width;
+   ch.sort(function(a, b) { 
+     var diff = b._area - a._area; 
+     return diff? diff : (b.id == a.id? 0 : (b.id < a.id? 1 : -1)); 
+   });
+   var initElem = [ch[0]];
+   var tail = ch.slice(1);
+   this.squarify(tail, initElem, minimumSideValue, coord, prop);
+ },
+
+ /*
+   Method: squarify
+ 
+   Performs an heuristic method to calculate div elements sizes in order to have a good aspect ratio.
+ 
+    Parameters:
+
+       tail - An array of nodes.  
+       initElem - An array of nodes, containing the initial node to be laid out.
+       w - A fixed dimension where nodes will be laid out.
+       coord - A coordinates object specifying width, height, left and top style properties.
+ */
+ squarify: function(tail, initElem, w, coord, prop) {
+   this.computeDim(tail, initElem, w, coord, this.worstAspectRatio, prop);
+ },
+ 
+ /*
+    Method: layoutRow
+ 
+   Performs the layout of an array of nodes.
+ 
+    Parameters:
+
+       ch - An array of nodes.  
+       w - A fixed dimension where nodes will be laid out.
+       coord - A coordinates object specifying width, height, left and top style properties.
+ */
+ layoutRow: function(ch, w, coord, prop) {
+   if(this.layout.horizontal()) {
+     return this.layoutV(ch, w, coord, prop);
+   } else {
+     return this.layoutH(ch, w, coord, prop);
+   }
+ },
+ 
+ layoutV: function(ch, w, coord, prop) {
+   var totalArea = 0, rnd = function(x) { return x; }; 
+   $.each(ch, function(elem) { totalArea += elem._area; });
+   var width = rnd(totalArea / w), top =  0; 
+   for(var i=0, l=ch.length; i<l; i++) {
+     var h = rnd(ch[i]._area / width);
+     var chi = ch[i];
+     chi.getPos(prop).setc(coord.left, coord.top + top);
+     chi.setData('width', width, prop);
+     chi.setData('height', h, prop);
+     top += h;
+   }
+   var ans = {
+     'height': coord.height,
+     'width': coord.width - width,
+     'top': coord.top,
+     'left': coord.left + width
+   };
+   //take minimum side value.
+   ans.dim = Math.min(ans.width, ans.height);
+   if(ans.dim != ans.height) this.layout.change();
+   return ans;
+ },
+ 
+ layoutH: function(ch, w, coord, prop) {
+   var totalArea = 0; 
+   $.each(ch, function(elem) { totalArea += elem._area; });
+   var height = totalArea / w,
+       top = coord.top, 
+       left = 0;
+   
+   for(var i=0, l=ch.length; i<l; i++) {
+     var chi = ch[i];
+     var w = chi._area / height;
+     chi.getPos(prop).setc(coord.left + left, top);
+     chi.setData('width', w, prop);
+     chi.setData('height', height, prop);
+     left += w;
+   }
+   var ans = {
+     'height': coord.height - height,
+     'width': coord.width,
+     'top': coord.top + height,
+     'left': coord.left
+   };
+   ans.dim = Math.min(ans.width, ans.height);
+   if(ans.dim != ans.width) this.layout.change();
+   return ans;
+ }
+});
+
+Layouts.TM.Strip = new Class({
+  Implements: Layouts.TM.Area,
+
+    /*
+      Method: compute
+    
+     Called by loadJSON to calculate recursively all node positions and lay out the tree.
+    
+      Parameters:
+    
+         json - A JSON subtree. See also <Loader.loadJSON>. 
+       coord - A coordinates object specifying width, height, left and top style properties.
+    */
+    computePositions: function(node, coord, prop) {
+     var ch = node.getSubnodes([1, 1], "ignore"), config = this.config;
+     if(ch.length > 0) {
+       this.processChildrenLayout(node, ch, coord, prop);
+       for(var i=0, l=ch.length; i<l; i++) {
+         var chi = ch[i];
+         var offst = config.offset,
+             height = chi.getData('height', prop) - offst - config.titleHeight,
+             width  = chi.getData('width', prop)  - offst;
+         var chipos = chi.getPos(prop);
+         coord = {
+           'width': width,
+           'height': height,
+           'top': chipos.y + config.titleHeight,
+           'left': chipos.x
+         };
+         this.computePositions(chi, coord, prop);
+       }
+     }
+    },
+    
+    /*
+      Method: processChildrenLayout
+    
+     Computes children real areas and other useful parameters for performing the Strip algorithm.
+    
+      Parameters:
+    
+         par - The parent node of the json subtree.  
+         ch - An Array of nodes
+         coord - A coordinates object specifying width, height, left and top style properties.
+    */
+    processChildrenLayout: function(par, ch, coord, prop) {
+     //compute children real areas
+      var parentArea = coord.width * coord.height;
+      var i, l=ch.length, totalChArea=0, chArea = [];
+      for(i=0; i<l; i++) {
+        chArea[i] = +ch[i].getData('area', prop);
+        totalChArea += chArea[i];
+      }
+      for(i=0; i<l; i++) {
+        ch[i]._area = parentArea * chArea[i] / totalChArea;
+      }
+     var side = this.layout.horizontal()? coord.width : coord.height;
+     var initElem = [ch[0]];
+     var tail = ch.slice(1);
+     this.stripify(tail, initElem, side, coord, prop);
+    },
+    
+    /*
+      Method: stripify
+    
+     Performs an heuristic method to calculate div elements sizes in order to have 
+     a good compromise between aspect ratio and order.
+    
+      Parameters:
+    
+         tail - An array of nodes.  
+         initElem - An array of nodes.
+         w - A fixed dimension where nodes will be layed out.
+       coord - A coordinates object specifying width, height, left and top style properties.
+    */
+    stripify: function(tail, initElem, w, coord, prop) {
+     this.computeDim(tail, initElem, w, coord, this.avgAspectRatio, prop);
+    },
+    
+    /*
+      Method: layoutRow
+    
+     Performs the layout of an array of nodes.
+    
+      Parameters:
+    
+         ch - An array of nodes.  
+         w - A fixed dimension where nodes will be laid out.
+         coord - A coordinates object specifying width, height, left and top style properties.
+    */
+    layoutRow: function(ch, w, coord, prop) {
+     if(this.layout.horizontal()) {
+       return this.layoutH(ch, w, coord, prop);
+     } else {
+       return this.layoutV(ch, w, coord, prop);
+     }
+    },
+    
+    layoutV: function(ch, w, coord, prop) {
+     var totalArea = 0; 
+     $.each(ch, function(elem) { totalArea += elem._area; });
+     var width = totalArea / w, top =  0; 
+     for(var i=0, l=ch.length; i<l; i++) {
+       var chi = ch[i];
+       var h = chi._area / width;
+       chi.getPos(prop).setc(coord.left, 
+           coord.top + (w - h - top));
+       chi.setData('width', width, prop);
+       chi.setData('height', h, prop);
+       top += h;
+     }
+    
+     return {
+       'height': coord.height,
+       'width': coord.width - width,
+       'top': coord.top,
+       'left': coord.left + width,
+       'dim': w
+     };
+    },
+    
+    layoutH: function(ch, w, coord, prop) {
+     var totalArea = 0; 
+     $.each(ch, function(elem) { totalArea += elem._area; });
+     var height = totalArea / w,
+         top = coord.height - height, 
+         left = 0;
+     
+     for(var i=0, l=ch.length; i<l; i++) {
+       var chi = ch[i];
+       var s = chi._area / height;
+       chi.getPos(prop).setc(coord.left + left, coord.top + top);
+       chi.setData('width', s, prop);
+       chi.setData('height', height, prop);
+       left += s;
+     }
+     return {
+       'height': coord.height - height,
+       'width': coord.width,
+       'top': coord.top,
+       'left': coord.left,
+       'dim': w
+     };
+    }
+ });
+
+/*
+ * Class: Layouts.Icicle
+ *
+ * Implements the icicle tree layout.
+ *
+ * Implemented By:
+ *
+ * <Icicle>
+ *
+ */
+
+Layouts.Icicle = new Class({
+ /*
+  * Method: compute
+  *
+  * Called by loadJSON to calculate all node positions.
+  *
+  * Parameters:
+  *
+  * posType - The nodes' position to compute. Either "start", "end" or
+  *            "current". Defaults to "current".
+  */
+  compute: function(posType) {
+    posType = posType || "current";
+
+    var root = this.graph.getNode(this.root),
+        config = this.config,
+        size = this.canvas.getSize(),
+        width = size.width,
+        height = size.height,
+        offset = config.offset,
+        levelsToShow = config.constrained ? config.levelsToShow : Number.MAX_VALUE;
+
+    this.controller.onBeforeCompute(root);
+
+    Graph.Util.computeLevels(this.graph, root.id, 0, "ignore");
+
+    var treeDepth = 0;
+
+    Graph.Util.eachLevel(root, 0, false, function (n, d) { if(d > treeDepth) treeDepth = d; });
+
+    var startNode = this.graph.getNode(this.clickedNode && this.clickedNode.id || root.id);
+    var maxDepth = Math.min(treeDepth, levelsToShow-1);
+    var initialDepth = startNode._depth;
+    if(this.layout.horizontal()) {
+      this.computeSubtree(startNode, -width/2, -height/2, width/(maxDepth+1), height, initialDepth, maxDepth, posType);
+    } else {
+      this.computeSubtree(startNode, -width/2, -height/2, width, height/(maxDepth+1), initialDepth, maxDepth, posType);
+    }
+  },
+
+  computeSubtree: function (root, x, y, width, height, initialDepth, maxDepth, posType) {
+    root.getPos(posType).setc(x, y);
+    root.setData('width', width, posType);
+    root.setData('height', height, posType);
+
+    var nodeLength, prevNodeLength = 0, totalDim = 0;
+    var children = Graph.Util.getSubnodes(root, [1, 1]); // next level from this node
+
+    if(!children.length)
+      return;
+
+    $.each(children, function(e) { totalDim += e.getData('dim'); });
+
+    for(var i=0, l=children.length; i < l; i++) {
+      if(this.layout.horizontal()) {
+        nodeLength = height * children[i].getData('dim') / totalDim;
+        this.computeSubtree(children[i], x+width, y, width, nodeLength, initialDepth, maxDepth, posType);
+        y += nodeLength;
+      } else {
+        nodeLength = width * children[i].getData('dim') / totalDim;
+        this.computeSubtree(children[i], x, y+height, nodeLength, height, initialDepth, maxDepth, posType);
+        x += nodeLength;
+      }
+    }
+  }
+});
+
+
+
+/*
+ * File: Icicle.js
+ *
+*/
+
+/*
+  Class: Icicle
+  
+  Icicle space filling visualization.
+  
+  Implements:
+  
+  All <Loader> methods
+  
+  Constructor Options:
+  
+  Inherits options from
+  
+  - <Options.Canvas>
+  - <Options.Controller>
+  - <Options.Node>
+  - <Options.Edge>
+  - <Options.Label>
+  - <Options.Events>
+  - <Options.Tips>
+  - <Options.NodeStyles>
+  - <Options.Navigation>
+  
+  Additionally, there are other parameters and some default values changed
+
+  orientation - (string) Default's *h*. Whether to set horizontal or vertical layouts. Possible values are 'h' and 'v'.
+  offset - (number) Default's *2*. Boxes offset.
+  constrained - (boolean) Default's *false*. Whether to show the entire tree when loaded or just the number of levels specified by _levelsToShow_.
+  levelsToShow - (number) Default's *3*. The number of levels to show for a subtree. This number is relative to the selected node.
+  animate - (boolean) Default's *false*. Whether to animate transitions.
+  Node.type - Described in <Options.Node>. Default's *rectangle*.
+  Label.type - Described in <Options.Label>. Default's *Native*.
+  duration - Described in <Options.Fx>. Default's *700*.
+  fps - Described in <Options.Fx>. Default's *45*.
+  
+  Instance Properties:
+  
+  canvas - Access a <Canvas> instance.
+  graph - Access a <Graph> instance.
+  op - Access a <Icicle.Op> instance.
+  fx - Access a <Icicle.Plot> instance.
+  labels - Access a <Icicle.Label> interface implementation.
+
+*/
+
+$jit.Icicle = new Class({
+  Implements: [ Loader, Extras, Layouts.Icicle ],
+
+  layout: {
+    orientation: "h",
+    vertical: function(){
+      return this.orientation == "v";
+    },
+    horizontal: function(){
+      return this.orientation == "h";
+    },
+    change: function(){
+      this.orientation = this.vertical()? "h" : "v";
+    }
+  },
+
+  initialize: function(controller) {
+    var config = {
+      animate: false,
+      orientation: "h",
+      offset: 2,
+      levelsToShow: Number.MAX_VALUE,
+      constrained: false,
+      Node: {
+        type: 'rectangle',
+        overridable: true
+      },
+      Edge: {
+        type: 'none'
+      },
+      Label: {
+        type: 'Native'
+      },
+      duration: 700,
+      fps: 45
+    };
+
+    var opts = Options("Canvas", "Node", "Edge", "Fx", "Tips", "NodeStyles",
+                       "Events", "Navigation", "Controller", "Label");
+    this.controller = this.config = $.merge(opts, config, controller);
+    this.layout.orientation = this.config.orientation;
+
+    var canvasConfig = this.config;
+    if (canvasConfig.useCanvas) {
+      this.canvas = canvasConfig.useCanvas;
+      this.config.labelContainer = this.canvas.id + '-label';
+    } else {
+      this.canvas = new Canvas(this, canvasConfig);
+      this.config.labelContainer = (typeof canvasConfig.injectInto == 'string'? canvasConfig.injectInto : canvasConfig.injectInto.id) + '-label';
+    }
+
+    this.graphOptions = {
+      'complex': true,
+      'Node': {
+        'selected': false,
+        'exist': true,
+        'drawn': true
+      }
+    };
+
+    this.graph = new Graph(
+      this.graphOptions, this.config.Node, this.config.Edge, this.config.Label);
+
+    this.labels = new $jit.Icicle.Label[this.config.Label.type](this);
+    this.fx = new $jit.Icicle.Plot(this, $jit.Icicle);
+    this.op = new $jit.Icicle.Op(this);
+    this.group = new $jit.Icicle.Group(this);
+    this.clickedNode = null;
+
+    this.initializeExtras();
+  },
+
+  /* 
+    Method: refresh 
+    
+    Computes positions and plots the tree.
+  */
+  refresh: function(){
+    var labelType = this.config.Label.type;
+    if(labelType != 'Native') {
+      var that = this;
+      this.graph.eachNode(function(n) { that.labels.hideLabel(n, false); });
+    }
+    this.compute();
+    this.plot();
+  },
+
+  /* 
+    Method: plot 
+    
+    Plots the Icicle visualization. This is a shortcut to *fx.plot*. 
+  
+   */
+  plot: function(){
+    this.fx.plot(this.config);
+  },
+
+  /* 
+    Method: enter 
+    
+    Sets the node as root.
+    
+     Parameters:
+     
+     node - (object) A <Graph.Node>.
+  
+   */
+  enter: function (node) {
+    if (this.busy)
+      return;
+    this.busy = true;
+
+    var that = this,
+        config = this.config;
+
+    var callback = {
+      onComplete: function() {
+        //compute positions of newly inserted nodes
+        if(config.request)
+          that.compute();
+
+        if(config.animate) {
+          that.graph.nodeList.setDataset(['current', 'end'], {
+            'alpha': [1, 0] //fade nodes
+          });
+
+          Graph.Util.eachSubgraph(node, function(n) {
+            n.setData('alpha', 1, 'end');
+          }, "ignore");
+
+          that.fx.animate({
+            duration: 500,
+            modes:['node-property:alpha'],
+            onComplete: function() {
+              that.clickedNode = node;
+              that.compute('end');
+
+              that.fx.animate({
+                modes:['linear', 'node-property:width:height'],
+                duration: 1000,
+                onComplete: function() {
+                  that.busy = false;
+                  that.clickedNode = node;
+                }
+              });
+            }
+          });
+        } else {
+          that.clickedNode = node;
+          that.busy = false;
+          that.refresh();
+        }
+      }
+    };
+
+    if(config.request) {
+      this.requestNodes(clickedNode, callback);
+    } else {
+      callback.onComplete();
+    }
+  },
+
+  /* 
+    Method: out 
+    
+    Sets the parent node of the current selected node as root.
+  
+   */
+  out: function(){
+    if(this.busy)
+      return;
+
+    var that = this,
+        GUtil = Graph.Util,
+        config = this.config,
+        graph = this.graph,
+        parents = GUtil.getParents(graph.getNode(this.clickedNode && this.clickedNode.id || this.root)),
+        parent = parents[0],
+        clickedNode = parent,
+        previousClickedNode = this.clickedNode;
+
+    this.busy = true;
+    this.events.hoveredNode = false;
+
+    if(!parent) {
+      this.busy = false;
+      return;
+    }
+
+    //final plot callback
+    callback = {
+      onComplete: function() {
+        that.clickedNode = parent;
+        if(config.request) {
+          that.requestNodes(parent, {
+            onComplete: function() {
+              that.compute();
+              that.plot();
+              that.busy = false;
+            }
+          });
+        } else {
+          that.compute();
+          that.plot();
+          that.busy = false;
+        }
+      }
+    };
+
+    //animate node positions
+    if(config.animate) {
+      this.clickedNode = clickedNode;
+      this.compute('end');
+      //animate the visible subtree only
+      this.clickedNode = previousClickedNode;
+      this.fx.animate({
+        modes:['linear', 'node-property:width:height'],
+        duration: 1000,
+        onComplete: function() {
+          //animate the parent subtree
+          that.clickedNode = clickedNode;
+          //change nodes alpha
+          graph.nodeList.setDataset(['current', 'end'], {
+            'alpha': [0, 1]
+          });
+          GUtil.eachSubgraph(previousClickedNode, function(node) {
+            node.setData('alpha', 1);
+          }, "ignore");
+          that.fx.animate({
+            duration: 500,
+            modes:['node-property:alpha'],
+            onComplete: function() {
+              callback.onComplete();
+            }
+          });
+        }
+      });
+    } else {
+      callback.onComplete();
+    }
+  },
+  requestNodes: function(node, onComplete){
+    var handler = $.merge(this.controller, onComplete),
+        levelsToShow = this.config.constrained ? this.config.levelsToShow : Number.MAX_VALUE;
+
+    if (handler.request) {
+      var leaves = [], d = node._depth;
+      Graph.Util.eachLevel(node, 0, levelsToShow, function(n){
+        if (n.drawn && !Graph.Util.anySubnode(n)) {
+          leaves.push(n);
+          n._level = n._depth - d;
+          if (this.config.constrained)
+            n._level = levelsToShow - n._level;
+
+        }
+      });
+      this.group.requestNodes(leaves, handler);
+    } else {
+      handler.onComplete();
+    }
+  }
+});
+
+/*
+  Class: Icicle.Op
+  
+  Custom extension of <Graph.Op>.
+  
+  Extends:
+  
+  All <Graph.Op> methods
+  
+  See also:
+  
+  <Graph.Op>
+  
+  */
+$jit.Icicle.Op = new Class({
+
+  Implements: Graph.Op
+
+});
+
+/*
+ * Performs operations on group of nodes.
+ */
+$jit.Icicle.Group = new Class({
+
+  initialize: function(viz){
+    this.viz = viz;
+    this.canvas = viz.canvas;
+    this.config = viz.config;
+  },
+
+  /*
+   * Calls the request method on the controller to request a subtree for each node.
+   */
+  requestNodes: function(nodes, controller){
+    var counter = 0, len = nodes.length, nodeSelected = {};
+    var complete = function(){
+      controller.onComplete();
+    };
+    var viz = this.viz;
+    if (len == 0)
+      complete();
+    for(var i = 0; i < len; i++) {
+      nodeSelected[nodes[i].id] = nodes[i];
+      controller.request(nodes[i].id, nodes[i]._level, {
+        onComplete: function(nodeId, data){
+          if (data && data.children) {
+            data.id = nodeId;
+            viz.op.sum(data, {
+              type: 'nothing'
+            });
+          }
+          if (++counter == len) {
+            Graph.Util.computeLevels(viz.graph, viz.root, 0);
+            complete();
+          }
+        }
+      });
+    }
+  }
+});
+
+/*
+  Class: Icicle.Plot
+  
+  Custom extension of <Graph.Plot>.
+  
+  Extends:
+  
+  All <Graph.Plot> methods
+  
+  See also:
+  
+  <Graph.Plot>
+  
+  */
+$jit.Icicle.Plot = new Class({
+  Implements: Graph.Plot,
+
+  plot: function(opt, animating){
+    opt = opt || this.viz.controller;
+    var viz = this.viz,
+        graph = viz.graph,
+        root = graph.getNode(viz.clickedNode && viz.clickedNode.id || viz.root),
+        initialDepth = root._depth;
+
+    viz.canvas.clear();
+    this.plotTree(root, $.merge(opt, {
+      'withLabels': true,
+      'hideLabels': false,
+      'plotSubtree': function(root, node) {
+        return !viz.config.constrained ||
+               (node._depth - initialDepth < viz.config.levelsToShow);
+      }
+    }), animating);
+  }
+});
+
+/*
+  Class: Icicle.Label
+  
+  Custom extension of <Graph.Label>. 
+  Contains custom <Graph.Label.SVG>, <Graph.Label.HTML> and <Graph.Label.Native> extensions.
+  
+  Extends:
+  
+  All <Graph.Label> methods and subclasses.
+  
+  See also:
+  
+  <Graph.Label>, <Graph.Label.Native>, <Graph.Label.HTML>, <Graph.Label.SVG>.
+  
+  */
+$jit.Icicle.Label = {};
+
+/*
+  Icicle.Label.Native
+  
+  Custom extension of <Graph.Label.Native>.
+  
+  Extends:
+  
+  All <Graph.Label.Native> methods
+  
+  See also:
+  
+  <Graph.Label.Native>
+
+  */
+$jit.Icicle.Label.Native = new Class({
+  Implements: Graph.Label.Native,
+
+  renderLabel: function(canvas, node, controller) {
+    var ctx = canvas.getCtx(),
+        width = node.getData('width'),
+        height = node.getData('height'),
+        size = node.getLabelData('size'),
+        m = ctx.measureText(node.name);
+
+    // Guess as much as possible if the label will fit in the node
+    if(height < (size * 1.5) || width < m.width)
+      return;
+
+    var pos = node.pos.getc(true);
+    ctx.fillText(node.name,
+                 pos.x + width / 2,
+                 pos.y + height / 2);
+  }
+});
+
+/*
+  Icicle.Label.SVG
+  
+  Custom extension of <Graph.Label.SVG>.
+  
+  Extends:
+  
+  All <Graph.Label.SVG> methods
+  
+  See also:
+  
+  <Graph.Label.SVG>
+*/
+$jit.Icicle.Label.SVG = new Class( {
+  Implements: Graph.Label.SVG,
+
+  initialize: function(viz){
+    this.viz = viz;
+  },
+
+  /*
+    placeLabel
+   
+    Overrides abstract method placeLabel in <Graph.Plot>.
+   
+    Parameters:
+   
+    tag - A DOM label element.
+    node - A <Graph.Node>.
+    controller - A configuration/controller object passed to the visualization.
+   */
+  placeLabel: function(tag, node, controller){
+    var pos = node.pos.getc(true), canvas = this.viz.canvas;
+    var radius = canvas.getSize();
+    var labelPos = {
+      x: Math.round(pos.x + radius.width / 2),
+      y: Math.round(pos.y + radius.height / 2)
+    };
+    tag.setAttribute('x', labelPos.x);
+    tag.setAttribute('y', labelPos.y);
+
+    controller.onPlaceLabel(tag, node);
+  }
+});
+
+/*
+  Icicle.Label.HTML
+  
+  Custom extension of <Graph.Label.HTML>.
+  
+  Extends:
+  
+  All <Graph.Label.HTML> methods.
+  
+  See also:
+  
+  <Graph.Label.HTML>
+  
+  */
+$jit.Icicle.Label.HTML = new Class( {
+  Implements: Graph.Label.HTML,
+
+  initialize: function(viz){
+    this.viz = viz;
+  },
+
+  /*
+    placeLabel
+   
+    Overrides abstract method placeLabel in <Graph.Plot>.
+   
+    Parameters:
+   
+    tag - A DOM label element.
+    node - A <Graph.Node>.
+    controller - A configuration/controller object passed to the visualization.
+   */
+  placeLabel: function(tag, node, controller){
+    var pos = node.pos.getc(true), canvas = this.viz.canvas;
+    var radius = canvas.getSize();
+    var labelPos = {
+      x: Math.round(pos.x + radius.width / 2),
+      y: Math.round(pos.y + radius.height / 2)
+    };
+
+    var style = tag.style;
+    style.left = labelPos.x + 'px';
+    style.top = labelPos.y + 'px';
+    style.display = '';
+
+    controller.onPlaceLabel(tag, node);
+  }
+});
+
+/*
+  Class: Icicle.Plot.NodeTypes
+  
+  This class contains a list of <Graph.Node> built-in types. 
+  Node types implemented are 'none', 'rectangle'.
+  
+  You can add your custom node types, customizing your visualization to the extreme.
+  
+  Example:
+  
+  (start code js)
+    Icicle.Plot.NodeTypes.implement({
+      'mySpecialType': {
+        'render': function(node, canvas) {
+          //print your custom node to canvas
+        },
+        //optional
+        'contains': function(node, pos) {
+          //return true if pos is inside the node or false otherwise
+        }
+      }
+    });
+  (end code)
+  
+  */
+$jit.Icicle.Plot.NodeTypes = new Class( {
+  'none': {
+    'render': $.empty
+  },
+
+  'rectangle': {
+    'render': function(node, canvas, animating) {
+      var config = this.viz.config;
+      var offset = config.offset;
+      var width = node.getData('width');
+      var height = node.getData('height');
+      var border = node.getData('border');
+      var pos = node.pos.getc(true);
+      var posx = pos.x + offset / 2, posy = pos.y + offset / 2;
+      var ctx = canvas.getCtx();
+      
+      if(width - offset < 2 || height - offset < 2) return;
+      
+      if(config.cushion) {
+        var color = node.getData('color');
+        var lg = ctx.createRadialGradient(posx + (width - offset)/2, 
+                                          posy + (height - offset)/2, 1, 
+                                          posx + (width-offset)/2, posy + (height-offset)/2, 
+                                          width < height? height : width);
+        var colorGrad = $.rgbToHex($.map($.hexToRgb(color), 
+            function(r) { return r * 0.3 >> 0; }));
+        lg.addColorStop(0, color);
+        lg.addColorStop(1, colorGrad);
+        ctx.fillStyle = lg;
+      }
+
+      if (border) {
+        ctx.strokeStyle = border;
+        ctx.lineWidth = 3;
+      }
+
+      ctx.fillRect(posx, posy, Math.max(0, width - offset), Math.max(0, height - offset));
+      border && ctx.strokeRect(pos.x, pos.y, width, height);
+    },
+
+    'contains': function(node, pos) {
+      if(this.viz.clickedNode && !$jit.Graph.Util.isDescendantOf(node, this.viz.clickedNode.id)) return false;
+      var npos = node.pos.getc(true),
+          width = node.getData('width'),
+          height = node.getData('height');
+      return this.nodeHelper.rectangle.contains({x: npos.x + width/2, y: npos.y + height/2}, pos, width, height);
+    }
+  }
+});
+
+$jit.Icicle.Plot.EdgeTypes = new Class( {
+  'none': $.empty
+});
+
+
+
+/*
+ * File: Layouts.ForceDirected.js
+ *
+*/
+
+/*
+ * Class: Layouts.ForceDirected
+ * 
+ * Implements a Force Directed Layout.
+ * 
+ * Implemented By:
+ * 
+ * <ForceDirected>
+ * 
+ * Credits:
+ * 
+ * Marcus Cobden <http://marcuscobden.co.uk>
+ * 
+ */
+Layouts.ForceDirected = new Class({
+
+  getOptions: function(random) {
+    var s = this.canvas.getSize();
+    var w = s.width, h = s.height;
+    //count nodes
+    var count = 0;
+    this.graph.eachNode(function(n) { 
+      count++;
+    });
+    var k2 = w * h / count, k = Math.sqrt(k2);
+    var l = this.config.levelDistance;
+    
+    return {
+      width: w,
+      height: h,
+      tstart: w * 0.1,
+      nodef: function(x) { return k2 / (x || 1); },
+      edgef: function(x) { return /* x * x / k; */ k * (x - l); }
+    };
+  },
+  
+  compute: function(property, incremental) {
+    var prop = $.splat(property || ['current', 'start', 'end']);
+    var opt = this.getOptions();
+    NodeDim.compute(this.graph, prop, this.config);
+    this.graph.computeLevels(this.root, 0, "ignore");
+    this.graph.eachNode(function(n) {
+      $.each(prop, function(p) {
+        var pos = n.getPos(p);
+        if(pos.equals(Complex.KER)) {
+          pos.x = opt.width/5 * (Math.random() - 0.5);
+          pos.y = opt.height/5 * (Math.random() - 0.5);
+        }
+        //initialize disp vector
+        n.disp = {};
+        $.each(prop, function(p) {
+          n.disp[p] = $C(0, 0);
+        });
+      });
+    });
+    this.computePositions(prop, opt, incremental);
+  },
+  
+  computePositions: function(property, opt, incremental) {
+    var times = this.config.iterations, i = 0, that = this;
+    if(incremental) {
+      (function iter() {
+        for(var total=incremental.iter, j=0; j<total; j++) {
+          opt.t = opt.tstart * (1 - i++/(times -1));
+          that.computePositionStep(property, opt);
+          if(i >= times) {
+            incremental.onComplete();
+            return;
+          }
+        }
+        incremental.onStep(Math.round(i / (times -1) * 100));
+        setTimeout(iter, 1);
+      })();
+    } else {
+      for(; i < times; i++) {
+        opt.t = opt.tstart * (1 - i/(times -1));
+        this.computePositionStep(property, opt);
+      }
+    }
+  },
+  
+  computePositionStep: function(property, opt) {
+    var graph = this.graph;
+    var min = Math.min, max = Math.max;
+    var dpos = $C(0, 0);
+    //calculate repulsive forces
+    graph.eachNode(function(v) {
+      //initialize disp
+      $.each(property, function(p) {
+        v.disp[p].x = 0; v.disp[p].y = 0;
+      });
+      graph.eachNode(function(u) {
+        if(u.id != v.id) {
+          $.each(property, function(p) {
+            var vp = v.getPos(p), up = u.getPos(p);
+            dpos.x = vp.x - up.x;
+            dpos.y = vp.y - up.y;
+            var norm = dpos.norm() || 1;
+            v.disp[p].$add(dpos
+                .$scale(opt.nodef(norm) / norm));
+          });
+        }
+      });
+    });
+    //calculate attractive forces
+    var T = !!graph.getNode(this.root).visited;
+    graph.eachNode(function(node) {
+      node.eachAdjacency(function(adj) {
+        var nodeTo = adj.nodeTo;
+        if(!!nodeTo.visited === T) {
+          $.each(property, function(p) {
+            var vp = node.getPos(p), up = nodeTo.getPos(p);
+            dpos.x = vp.x - up.x;
+            dpos.y = vp.y - up.y;
+            var norm = dpos.norm() || 1;
+            node.disp[p].$add(dpos.$scale(-opt.edgef(norm) / norm));
+            nodeTo.disp[p].$add(dpos.$scale(-1));
+          });
+        }
+      });
+      node.visited = !T;
+    });
+    //arrange positions to fit the canvas
+    var t = opt.t, w2 = opt.width / 2, h2 = opt.height / 2;
+    graph.eachNode(function(u) {
+      $.each(property, function(p) {
+        var disp = u.disp[p];
+        var norm = disp.norm() || 1;
+        var p = u.getPos(p);
+        p.$add($C(disp.x * min(Math.abs(disp.x), t) / norm, 
+            disp.y * min(Math.abs(disp.y), t) / norm));
+        p.x = min(w2, max(-w2, p.x));
+        p.y = min(h2, max(-h2, p.y));
+      });
+    });
+  }
+});
+
+/*
+ * File: ForceDirected.js
+ */
+
+/*
+   Class: ForceDirected
+      
+   A visualization that lays graphs using a Force-Directed layout algorithm.
+   
+   Inspired by:
+  
+   Force-Directed Drawing Algorithms (Stephen G. Kobourov) <http://www.cs.brown.edu/~rt/gdhandbook/chapters/force-directed.pdf>
+   
+  Implements:
+  
+  All <Loader> methods
+  
+   Constructor Options:
+   
+   Inherits options from
+   
+   - <Options.Canvas>
+   - <Options.Controller>
+   - <Options.Node>
+   - <Options.Edge>
+   - <Options.Label>
+   - <Options.Events>
+   - <Options.Tips>
+   - <Options.NodeStyles>
+   - <Options.Navigation>
+   
+   Additionally, there are two parameters
+   
+   levelDistance - (number) Default's *50*. The natural length desired for the edges.
+   iterations - (number) Default's *50*. The number of iterations for the spring layout simulation. Depending on the browser's speed you could set this to a more 'interesting' number, like *200*. 
+     
+   Instance Properties:
+
+   canvas - Access a <Canvas> instance.
+   graph - Access a <Graph> instance.
+   op - Access a <ForceDirected.Op> instance.
+   fx - Access a <ForceDirected.Plot> instance.
+   labels - Access a <ForceDirected.Label> interface implementation.
+
+*/
+
+$jit.ForceDirected = new Class( {
+
+  Implements: [ Loader, Extras, Layouts.ForceDirected ],
+
+  initialize: function(controller) {
+    var $ForceDirected = $jit.ForceDirected;
+
+    var config = {
+      iterations: 50,
+      levelDistance: 50
+    };
+
+    this.controller = this.config = $.merge(Options("Canvas", "Node", "Edge",
+        "Fx", "Tips", "NodeStyles", "Events", "Navigation", "Controller", "Label"), config, controller);
+
+    var canvasConfig = this.config;
+    if(canvasConfig.useCanvas) {
+      this.canvas = canvasConfig.useCanvas;
+      this.config.labelContainer = this.canvas.id + '-label';
+    } else {
+      if(canvasConfig.background) {
+        canvasConfig.background = $.merge({
+          type: 'Circles'
+        }, canvasConfig.background);
+      }
+      this.canvas = new Canvas(this, canvasConfig);
+      this.config.labelContainer = (typeof canvasConfig.injectInto == 'string'? canvasConfig.injectInto : canvasConfig.injectInto.id) + '-label';
+    }
+
+    this.graphOptions = {
+      'complex': true,
+      'Node': {
+        'selected': false,
+        'exist': true,
+        'drawn': true
+      }
+    };
+    this.graph = new Graph(this.graphOptions, this.config.Node,
+        this.config.Edge);
+    this.labels = new $ForceDirected.Label[canvasConfig.Label.type](this);
+    this.fx = new $ForceDirected.Plot(this, $ForceDirected);
+    this.op = new $ForceDirected.Op(this);
+    this.json = null;
+    this.busy = false;
+    // initialize extras
+    this.initializeExtras();
+  },
+
+  /* 
+    Method: refresh 
+    
+    Computes positions and plots the tree.
+  */
+  refresh: function() {
+    this.compute();
+    this.plot();
+  },
+
+  reposition: function() {
+    this.compute('end');
+  },
+
+/*
+  Method: computeIncremental
+  
+  Performs the Force Directed algorithm incrementally.
+  
+  Description:
+  
+  ForceDirected algorithms can perform many computations and lead to JavaScript taking too much time to complete. 
+  This method splits the algorithm into smaller parts allowing the user to track the evolution of the algorithm and 
+  avoiding browser messages such as "This script is taking too long to complete".
+  
+  Parameters:
+  
+  opt - (object) The object properties are described below
+  
+  iter - (number) Default's *20*. Split the algorithm into pieces of _iter_ iterations. For example, if the _iterations_ configuration property 
+  of your <ForceDirected> class is 100, then you could set _iter_ to 20 to split the main algorithm into 5 smaller pieces.
+  
+  property - (string) Default's *end*. Whether to update starting, current or ending node positions. Possible values are 'end', 'start', 'current'. 
+  You can also set an array of these properties. If you'd like to keep the current node positions but to perform these 
+  computations for final animation positions then you can just choose 'end'.
+  
+  onStep - (function) A callback function called when each "small part" of the algorithm completed. This function gets as first formal 
+  parameter a percentage value.
+  
+  onComplete - A callback function called when the algorithm completed.
+  
+  Example:
+  
+  In this example I calculate the end positions and then animate the graph to those positions
+  
+  (start code js)
+  var fd = new $jit.ForceDirected(...);
+  fd.computeIncremental({
+    iter: 20,
+    property: 'end',
+    onStep: function(perc) {
+      Log.write("loading " + perc + "%");
+    },
+    onComplete: function() {
+      Log.write("done");
+      fd.animate();
+    }
+  });
+  (end code)
+  
+  In this example I calculate all positions and (re)plot the graph
+  
+  (start code js)
+  var fd = new ForceDirected(...);
+  fd.computeIncremental({
+    iter: 20,
+    property: ['end', 'start', 'current'],
+    onStep: function(perc) {
+      Log.write("loading " + perc + "%");
+    },
+    onComplete: function() {
+      Log.write("done");
+      fd.plot();
+    }
+  });
+  (end code)
+  
+  */
+  computeIncremental: function(opt) {
+    opt = $.merge( {
+      iter: 20,
+      property: 'end',
+      onStep: $.empty,
+      onComplete: $.empty
+    }, opt || {});
+
+    this.config.onBeforeCompute(this.graph.getNode(this.root));
+    this.compute(opt.property, opt);
+  },
+
+  /*
+    Method: plot
+   
+    Plots the ForceDirected graph. This is a shortcut to *fx.plot*.
+   */
+  plot: function() {
+    this.fx.plot();
+  },
+
+  /*
+     Method: animate
+    
+     Animates the graph from the current positions to the 'end' node positions.
+  */
+  animate: function(opt) {
+    this.fx.animate($.merge( {
+      modes: [ 'linear' ]
+    }, opt || {}));
+  }
+});
+
+$jit.ForceDirected.$extend = true;
+
+(function(ForceDirected) {
+
+  /*
+     Class: ForceDirected.Op
+     
+     Custom extension of <Graph.Op>.
+
+     Extends:
+
+     All <Graph.Op> methods
+     
+     See also:
+     
+     <Graph.Op>
+
+  */
+  ForceDirected.Op = new Class( {
+
+    Implements: Graph.Op
+
+  });
+
+  /*
+    Class: ForceDirected.Plot
+    
+    Custom extension of <Graph.Plot>.
+  
+    Extends:
+  
+    All <Graph.Plot> methods
+    
+    See also:
+    
+    <Graph.Plot>
+  
+  */
+  ForceDirected.Plot = new Class( {
+
+    Implements: Graph.Plot
+
+  });
+
+  /*
+    Class: ForceDirected.Label
+    
+    Custom extension of <Graph.Label>. 
+    Contains custom <Graph.Label.SVG>, <Graph.Label.HTML> and <Graph.Label.Native> extensions.
+  
+    Extends:
+  
+    All <Graph.Label> methods and subclasses.
+  
+    See also:
+  
+    <Graph.Label>, <Graph.Label.Native>, <Graph.Label.HTML>, <Graph.Label.SVG>.
+  
+  */
+  ForceDirected.Label = {};
+
+  /*
+     ForceDirected.Label.Native
+     
+     Custom extension of <Graph.Label.Native>.
+
+     Extends:
+
+     All <Graph.Label.Native> methods
+
+     See also:
+
+     <Graph.Label.Native>
+
+  */
+  ForceDirected.Label.Native = new Class( {
+    Implements: Graph.Label.Native
+  });
+
+  /*
+    ForceDirected.Label.SVG
+    
+    Custom extension of <Graph.Label.SVG>.
+  
+    Extends:
+  
+    All <Graph.Label.SVG> methods
+  
+    See also:
+  
+    <Graph.Label.SVG>
+  
+  */
+  ForceDirected.Label.SVG = new Class( {
+    Implements: Graph.Label.SVG,
+
+    initialize: function(viz) {
+      this.viz = viz;
+    },
+
+    /* 
+       placeLabel
+
+       Overrides abstract method placeLabel in <Graph.Label>.
+
+       Parameters:
+
+       tag - A DOM label element.
+       node - A <Graph.Node>.
+       controller - A configuration/controller object passed to the visualization.
+      
+     */
+    placeLabel: function(tag, node, controller) {
+      var pos = node.pos.getc(true), 
+          canvas = this.viz.canvas,
+          ox = canvas.translateOffsetX,
+          oy = canvas.translateOffsetY,
+          sx = canvas.scaleOffsetX,
+          sy = canvas.scaleOffsetY,
+          radius = canvas.getSize();
+      var labelPos = {
+        x: Math.round(pos.x * sx + ox + radius.width / 2),
+        y: Math.round(pos.y * sy + oy + radius.height / 2)
+      };
+      tag.setAttribute('x', labelPos.x);
+      tag.setAttribute('y', labelPos.y);
+
+      controller.onPlaceLabel(tag, node);
+    }
+  });
+
+  /*
+     ForceDirected.Label.HTML
+     
+     Custom extension of <Graph.Label.HTML>.
+
+     Extends:
+
+     All <Graph.Label.HTML> methods.
+
+     See also:
+
+     <Graph.Label.HTML>
+
+  */
+  ForceDirected.Label.HTML = new Class( {
+    Implements: Graph.Label.HTML,
+
+    initialize: function(viz) {
+      this.viz = viz;
+    },
+    /* 
+       placeLabel
+
+       Overrides abstract method placeLabel in <Graph.Plot>.
+
+       Parameters:
+
+       tag - A DOM label element.
+       node - A <Graph.Node>.
+       controller - A configuration/controller object passed to the visualization.
+      
+     */
+    placeLabel: function(tag, node, controller) {
+      var pos = node.pos.getc(true), 
+          canvas = this.viz.canvas,
+          ox = canvas.translateOffsetX,
+          oy = canvas.translateOffsetY,
+          sx = canvas.scaleOffsetX,
+          sy = canvas.scaleOffsetY,
+          radius = canvas.getSize();
+      var labelPos = {
+        x: Math.round(pos.x * sx + ox + radius.width / 2),
+        y: Math.round(pos.y * sy + oy + radius.height / 2)
+      };
+      var style = tag.style;
+      style.left = labelPos.x + 'px';
+      style.top = labelPos.y + 'px';
+      style.display = this.fitsInCanvas(labelPos, canvas) ? '' : 'none';
+
+      controller.onPlaceLabel(tag, node);
+    }
+  });
+
+  /*
+    Class: ForceDirected.Plot.NodeTypes
+
+    This class contains a list of <Graph.Node> built-in types. 
+    Node types implemented are 'none', 'circle', 'triangle', 'rectangle', 'star', 'ellipse' and 'square'.
+
+    You can add your custom node types, customizing your visualization to the extreme.
+
+    Example:
+
+    (start code js)
+      ForceDirected.Plot.NodeTypes.implement({
+        'mySpecialType': {
+          'render': function(node, canvas) {
+            //print your custom node to canvas
+          },
+          //optional
+          'contains': function(node, pos) {
+            //return true if pos is inside the node or false otherwise
+          }
+        }
+      });
+    (end code)
+
+  */
+  ForceDirected.Plot.NodeTypes = new Class({
+    'none': {
+      'render': $.empty,
+      'contains': $.lambda(false)
+    },
+    'circle': {
+      'render': function(node, canvas){
+        var pos = node.pos.getc(true), 
+            dim = node.getData('dim');
+        this.nodeHelper.circle.render('fill', pos, dim, canvas);
+      },
+      'contains': function(node, pos){
+        var npos = node.pos.getc(true), 
+            dim = node.getData('dim');
+        return this.nodeHelper.circle.contains(npos, pos, dim);
+      }
+    },
+    'ellipse': {
+      'render': function(node, canvas){
+        var pos = node.pos.getc(true), 
+            width = node.getData('width'), 
+            height = node.getData('height');
+        this.nodeHelper.ellipse.render('fill', pos, width, height, canvas);
+        },
+      // TODO(nico): be more precise...
+      'contains': function(node, pos){
+        var npos = node.pos.getc(true), 
+            width = node.getData('width'), 
+            height = node.getData('height');
+        return this.nodeHelper.ellipse.contains(npos, pos, width, height);
+      }
+    },
+    'square': {
+      'render': function(node, canvas){
+        var pos = node.pos.getc(true), 
+            dim = node.getData('dim');
+        this.nodeHelper.square.render('fill', pos, dim, canvas);
+      },
+      'contains': function(node, pos){
+        var npos = node.pos.getc(true), 
+            dim = node.getData('dim');
+        return this.nodeHelper.square.contains(npos, pos, dim);
+      }
+    },
+    'rectangle': {
+      'render': function(node, canvas){
+        var pos = node.pos.getc(true), 
+            width = node.getData('width'), 
+            height = node.getData('height');
+        this.nodeHelper.rectangle.render('fill', pos, width, height, canvas);
+      },
+      'contains': function(node, pos){
+        var npos = node.pos.getc(true), 
+            width = node.getData('width'), 
+            height = node.getData('height');
+        return this.nodeHelper.rectangle.contains(npos, pos, width, height);
+      }
+    },
+    'triangle': {
+      'render': function(node, canvas){
+        var pos = node.pos.getc(true), 
+            dim = node.getData('dim');
+        this.nodeHelper.triangle.render('fill', pos, dim, canvas);
+      },
+      'contains': function(node, pos) {
+        var npos = node.pos.getc(true), 
+            dim = node.getData('dim');
+        return this.nodeHelper.triangle.contains(npos, pos, dim);
+      }
+    },
+    'star': {
+      'render': function(node, canvas){
+        var pos = node.pos.getc(true),
+            dim = node.getData('dim');
+        this.nodeHelper.star.render('fill', pos, dim, canvas);
+      },
+      'contains': function(node, pos) {
+        var npos = node.pos.getc(true),
+            dim = node.getData('dim');
+        return this.nodeHelper.star.contains(npos, pos, dim);
+      }
+    }
+  });
+
+  /*
+    Class: ForceDirected.Plot.EdgeTypes
+  
+    This class contains a list of <Graph.Adjacence> built-in types. 
+    Edge types implemented are 'none', 'line' and 'arrow'.
+  
+    You can add your custom edge types, customizing your visualization to the extreme.
+  
+    Example:
+  
+    (start code js)
+      ForceDirected.Plot.EdgeTypes.implement({
+        'mySpecialType': {
+          'render': function(adj, canvas) {
+            //print your custom edge to canvas
+          },
+          //optional
+          'contains': function(adj, pos) {
+            //return true if pos is inside the arc or false otherwise
+          }
+        }
+      });
+    (end code)
+  
+  */
+  ForceDirected.Plot.EdgeTypes = new Class({
+    'none': $.empty,
+    'line': {
+      'render': function(adj, canvas) {
+        var from = adj.nodeFrom.pos.getc(true),
+            to = adj.nodeTo.pos.getc(true);
+        this.edgeHelper.line.render(from, to, canvas);
+      },
+      'contains': function(adj, pos) {
+        var from = adj.nodeFrom.pos.getc(true),
+            to = adj.nodeTo.pos.getc(true);
+        return this.edgeHelper.line.contains(from, to, pos, this.edge.epsilon);
+      }
+    },
+    'arrow': {
+      'render': function(adj, canvas) {
+        var from = adj.nodeFrom.pos.getc(true),
+            to = adj.nodeTo.pos.getc(true),
+            dim = adj.getData('dim'),
+            direction = adj.data.$direction,
+            inv = (direction && direction.length>1 && direction[0] != adj.nodeFrom.id);
+        this.edgeHelper.arrow.render(from, to, dim, inv, canvas);
+      },
+      'contains': function(adj, pos) {
+        var from = adj.nodeFrom.pos.getc(true),
+            to = adj.nodeTo.pos.getc(true);
+        return this.edgeHelper.arrow.contains(from, to, pos, this.edge.epsilon);
+      }
+    }
+  });
+
+})($jit.ForceDirected);
+
+
+/*
+ * File: Treemap.js
+ *
+*/
+
+$jit.TM = {};
+
+var TM = $jit.TM;
+
+$jit.TM.$extend = true;
+
+/*
+  Class: TM.Base
+  
+  Abstract class providing base functionality for <TM.Squarified>, <TM.Strip> and <TM.SliceAndDice> visualizations.
+  
+  Implements:
+  
+  All <Loader> methods
+  
+  Constructor Options:
+  
+  Inherits options from
+  
+  - <Options.Canvas>
+  - <Options.Controller>
+  - <Options.Node>
+  - <Options.Edge>
+  - <Options.Label>
+  - <Options.Events>
+  - <Options.Tips>
+  - <Options.NodeStyles>
+  - <Options.Navigation>
+  
+  Additionally, there are other parameters and some default values changed
+
+  orientation - (string) Default's *h*. Whether to set horizontal or vertical layouts. Possible values are 'h' and 'v'.
+  titleHeight - (number) Default's *13*. The height of the title rectangle for inner (non-leaf) nodes.
+  offset - (number) Default's *2*. Boxes offset.
+  constrained - (boolean) Default's *false*. Whether to show the entire tree when loaded or just the number of levels specified by _levelsToShow_.
+  levelsToShow - (number) Default's *3*. The number of levels to show for a subtree. This number is relative to the selected node.
+  animate - (boolean) Default's *false*. Whether to animate transitions.
+  Node.type - Described in <Options.Node>. Default's *rectangle*.
+  duration - Described in <Options.Fx>. Default's *700*.
+  fps - Described in <Options.Fx>. Default's *45*.
+  
+  Instance Properties:
+  
+  canvas - Access a <Canvas> instance.
+  graph - Access a <Graph> instance.
+  op - Access a <TM.Op> instance.
+  fx - Access a <TM.Plot> instance.
+  labels - Access a <TM.Label> interface implementation.
+
+  Inspired by:
+  
+  Squarified Treemaps (Mark Bruls, Kees Huizing, and Jarke J. van Wijk) <http://www.win.tue.nl/~vanwijk/stm.pdf>
+  
+  Tree visualization with tree-maps: 2-d space-filling approach (Ben Shneiderman) <http://hcil.cs.umd.edu/trs/91-03/91-03.html>
+  
+   Note:
+   
+   This visualization was built and engineered from scratch, taking only the paper as inspiration, and only shares some features with the visualization described in the paper.
+
+*/
+TM.Base = {
+  layout: {
+    orientation: "h",
+    vertical: function(){
+      return this.orientation == "v";
+    },
+    horizontal: function(){
+      return this.orientation == "h";
+    },
+    change: function(){
+      this.orientation = this.vertical()? "h" : "v";
+    }
+  },
+
+  initialize: function(controller){
+    var config = {
+      orientation: "h",
+      titleHeight: 13,
+      offset: 2,
+      levelsToShow: 0,
+      constrained: false,
+      animate: false,
+      Node: {
+        type: 'rectangle',
+        overridable: true,
+        //we all know why this is not zero,
+        //right, Firefox?
+        width: 3,
+        height: 3,
+        color: '#444'
+      },
+      Label: {
+        textAlign: 'center',
+        textBaseline: 'top'
+      },
+      Edge: {
+        type: 'none'
+      },
+      duration: 700,
+      fps: 45
+    };
+
+    this.controller = this.config = $.merge(Options("Canvas", "Node", "Edge",
+        "Fx", "Controller", "Tips", "NodeStyles", "Events", "Navigation", "Label"), config, controller);
+    this.layout.orientation = this.config.orientation;
+
+    var canvasConfig = this.config;
+    if (canvasConfig.useCanvas) {
+      this.canvas = canvasConfig.useCanvas;
+      this.config.labelContainer = this.canvas.id + '-label';
+    } else {
+      if(canvasConfig.background) {
+        canvasConfig.background = $.merge({
+          type: 'Circles'
+        }, canvasConfig.background);
+      }
+      this.canvas = new Canvas(this, canvasConfig);
+      this.config.labelContainer = (typeof canvasConfig.injectInto == 'string'? canvasConfig.injectInto : canvasConfig.injectInto.id) + '-label';
+    }
+
+    this.graphOptions = {
+      'complex': true,
+      'Node': {
+        'selected': false,
+        'exist': true,
+        'drawn': true
+      }
+    };
+    this.graph = new Graph(this.graphOptions, this.config.Node,
+        this.config.Edge);
+    this.labels = new TM.Label[canvasConfig.Label.type](this);
+    this.fx = new TM.Plot(this);
+    this.op = new TM.Op(this);
+    this.group = new TM.Group(this);
+    this.geom = new TM.Geom(this);
+    this.clickedNode = null;
+    this.busy = false;
+    // initialize extras
+    this.initializeExtras();
+  },
+
+  /* 
+    Method: refresh 
+    
+    Computes positions and plots the tree.
+  */
+  refresh: function(){
+    if(this.busy) return;
+    this.busy = true;
+    var that = this;
+    if(this.config.animate) {
+      this.compute('end');
+      this.config.levelsToShow > 0 && this.geom.setRightLevelToShow(this.graph.getNode(this.clickedNode 
+          && this.clickedNode.id || this.root));
+      this.fx.animate($.merge(this.config, {
+        modes: ['linear', 'node-property:width:height'],
+        onComplete: function() {
+          that.busy = false;
+        }
+      }));
+    } else {
+      var labelType = this.config.Label.type;
+      if(labelType != 'Native') {
+        var that = this;
+        this.graph.eachNode(function(n) { that.labels.hideLabel(n, false); });
+      }
+      this.busy = false;
+      this.compute();
+      this.config.levelsToShow > 0 && this.geom.setRightLevelToShow(this.graph.getNode(this.clickedNode 
+          && this.clickedNode.id || this.root));
+      this.plot();
+    }
+  },
+
+  /* 
+    Method: plot 
+    
+    Plots the TreeMap. This is a shortcut to *fx.plot*. 
+  
+   */
+  plot: function(){
+    this.fx.plot();
+  },
+
+  /* 
+  Method: leaf 
+  
+  Returns whether the node is a leaf.
+  
+   Parameters:
+   
+   n - (object) A <Graph.Node>.
+
+ */
+  leaf: function(n){
+    return n.getSubnodes([
+        1, 1
+    ], "ignore").length == 0;
+  },
+  
+  /* 
+  Method: enter 
+  
+  Sets the node as root.
+  
+   Parameters:
+   
+   n - (object) A <Graph.Node>.
+
+ */
+  enter: function(n){
+    if(this.busy) return;
+    this.busy = true;
+    
+    var that = this,
+        config = this.config,
+        graph = this.graph,
+        clickedNode = n,
+        previousClickedNode = this.clickedNode;
+
+    var callback = {
+      onComplete: function() {
+        //ensure that nodes are shown for that level
+        if(config.levelsToShow > 0) {
+          that.geom.setRightLevelToShow(n);
+        }
+        //compute positions of newly inserted nodes
+        if(config.levelsToShow > 0 || config.request) that.compute();
+        if(config.animate) {
+          //fade nodes
+          graph.nodeList.setData('alpha', 0, 'end');
+          n.eachSubgraph(function(n) {
+            n.setData('alpha', 1, 'end');
+          }, "ignore");
+          that.fx.animate({
+            duration: 500,
+            modes:['node-property:alpha'],
+            onComplete: function() {
+              //compute end positions
+              that.clickedNode = clickedNode;
+              that.compute('end');
+              //animate positions
+              //TODO(nico) commenting this line didn't seem to throw errors...
+              that.clickedNode = previousClickedNode;
+              that.fx.animate({
+                modes:['linear', 'node-property:width:height'],
+                duration: 1000,
+                onComplete: function() { 
+                  that.busy = false;
+                  //TODO(nico) check comment above
+                  that.clickedNode = clickedNode;
+                }
+              });
+            }
+          });
+        } else {
+          that.busy = false;
+          that.clickedNode = n;
+          that.refresh();
+        }
+      }
+    };
+    if(config.request) {
+      this.requestNodes(clickedNode, callback);
+    } else {
+      callback.onComplete();
+    }
+  },
+
+  /* 
+  Method: out 
+  
+  Sets the parent node of the current selected node as root.
+
+ */
+  out: function(){
+    if(this.busy) return;
+    this.busy = true;
+    this.events.hoveredNode = false;
+    var that = this,
+        config = this.config,
+        graph = this.graph,
+        parents = graph.getNode(this.clickedNode 
+            && this.clickedNode.id || this.root).getParents(),
+        parent = parents[0],
+        clickedNode = parent,
+        previousClickedNode = this.clickedNode;
+    
+    //if no parents return
+    if(!parent) {
+      this.busy = false;
+      return;
+    }
+    //final plot callback
+    callback = {
+      onComplete: function() {
+        that.clickedNode = parent;
+        if(config.request) {
+          that.requestNodes(parent, {
+            onComplete: function() {
+              that.compute();
+              that.plot();
+              that.busy = false;
+            }
+          });
+        } else {
+          that.compute();
+          that.plot();
+          that.busy = false;
+        }
+      }
+    };
+    //prune tree
+    if (config.levelsToShow > 0)
+      this.geom.setRightLevelToShow(parent);
+    //animate node positions
+    if(config.animate) {
+      this.clickedNode = clickedNode;
+      this.compute('end');
+      //animate the visible subtree only
+      this.clickedNode = previousClickedNode;
+      this.fx.animate({
+        modes:['linear', 'node-property:width:height'],
+        duration: 1000,
+        onComplete: function() {
+          //animate the parent subtree
+          that.clickedNode = clickedNode;
+          //change nodes alpha
+          graph.eachNode(function(n) {
+            n.setDataset(['current', 'end'], {
+              'alpha': [0, 1]
+            });
+          }, "ignore");
+          previousClickedNode.eachSubgraph(function(node) {
+            node.setData('alpha', 1);
+          }, "ignore");
+          that.fx.animate({
+            duration: 500,
+            modes:['node-property:alpha'],
+            onComplete: function() {
+              callback.onComplete();
+            }
+          });
+        }
+      });
+    } else {
+      callback.onComplete();
+    }
+  },
+
+  requestNodes: function(node, onComplete){
+    var handler = $.merge(this.controller, onComplete), 
+        lev = this.config.levelsToShow;
+    if (handler.request) {
+      var leaves = [], d = node._depth;
+      node.eachLevel(0, lev, function(n){
+        var nodeLevel = lev - (n._depth - d);
+        if (n.drawn && !n.anySubnode() && nodeLevel > 0) {
+          leaves.push(n);
+          n._level = nodeLevel;
+        }
+      });
+      this.group.requestNodes(leaves, handler);
+    } else {
+      handler.onComplete();
+    }
+  }
+};
+
+/*
+  Class: TM.Op
+  
+  Custom extension of <Graph.Op>.
+  
+  Extends:
+  
+  All <Graph.Op> methods
+  
+  See also:
+  
+  <Graph.Op>
+  
+  */
+TM.Op = new Class({
+  Implements: Graph.Op,
+
+  initialize: function(viz){
+    this.viz = viz;
+  }
+});
+
+//extend level methods of Graph.Geom
+TM.Geom = new Class({
+  Implements: Graph.Geom,
+  
+  getRightLevelToShow: function() {
+    return this.viz.config.levelsToShow;
+  },
+  
+  setRightLevelToShow: function(node) {
+    var level = this.getRightLevelToShow(), 
+        fx = this.viz.labels;
+    node.eachLevel(0, level+1, function(n) {
+      var d = n._depth - node._depth;
+      if(d > level) {
+        n.drawn = false; 
+        n.exist = false;
+        n.ignore = true;
+        fx.hideLabel(n, false);
+      } else {
+        n.drawn = true;
+        n.exist = true;
+        delete n.ignore;
+      }
+    });
+    node.drawn = true;
+    delete node.ignore;
+  }
+});
+
+/*
+
+Performs operations on group of nodes.
+
+*/
+TM.Group = new Class( {
+
+  initialize: function(viz){
+    this.viz = viz;
+    this.canvas = viz.canvas;
+    this.config = viz.config;
+  },
+
+  /*
+  
+    Calls the request method on the controller to request a subtree for each node. 
+  */
+  requestNodes: function(nodes, controller){
+    var counter = 0, len = nodes.length, nodeSelected = {};
+    var complete = function(){
+      controller.onComplete();
+    };
+    var viz = this.viz;
+    if (len == 0)
+      complete();
+    for ( var i = 0; i < len; i++) {
+      nodeSelected[nodes[i].id] = nodes[i];
+      controller.request(nodes[i].id, nodes[i]._level, {
+        onComplete: function(nodeId, data){
+          if (data && data.children) {
+            data.id = nodeId;
+            viz.op.sum(data, {
+              type: 'nothing'
+            });
+          }
+          if (++counter == len) {
+            viz.graph.computeLevels(viz.root, 0);
+            complete();
+          }
+        }
+      });
+    }
+  }
+});
+
+/*
+  Class: TM.Plot
+  
+  Custom extension of <Graph.Plot>.
+  
+  Extends:
+  
+  All <Graph.Plot> methods
+  
+  See also:
+  
+  <Graph.Plot>
+  
+  */
+TM.Plot = new Class({
+
+  Implements: Graph.Plot,
+
+  initialize: function(viz){
+    this.viz = viz;
+    this.config = viz.config;
+    this.node = this.config.Node;
+    this.edge = this.config.Edge;
+    this.animation = new Animation;
+    this.nodeTypes = new TM.Plot.NodeTypes;
+    this.edgeTypes = new TM.Plot.EdgeTypes;
+    this.labels = viz.labels;
+  },
+
+  plot: function(opt, animating){
+    var viz = this.viz, 
+        graph = viz.graph;
+    viz.canvas.clear();
+    this.plotTree(graph.getNode(viz.clickedNode && viz.clickedNode.id || viz.root), $.merge(viz.config, opt || {}, {
+      'withLabels': true,
+      'hideLabels': false,
+      'plotSubtree': function(n, ch){
+        return n.anySubnode("exist");
+      }
+    }), animating);
+  }
+});
+
+/*
+  Class: TM.Label
+  
+  Custom extension of <Graph.Label>. 
+  Contains custom <Graph.Label.SVG>, <Graph.Label.HTML> and <Graph.Label.Native> extensions.
+
+  Extends:
+
+  All <Graph.Label> methods and subclasses.
+
+  See also:
+
+  <Graph.Label>, <Graph.Label.Native>, <Graph.Label.HTML>, <Graph.Label.SVG>.
+  
+*/
+TM.Label = {};
+
+/*
+ TM.Label.Native
+
+ Custom extension of <Graph.Label.Native>.
+
+ Extends:
+
+ All <Graph.Label.Native> methods
+
+ See also:
+
+ <Graph.Label.Native>
+*/
+TM.Label.Native = new Class({
+  Implements: Graph.Label.Native,
+
+  initialize: function(viz) {
+    this.config = viz.config;
+    this.leaf = viz.leaf;
+  },
+  
+  renderLabel: function(canvas, node, controller){
+    if(!this.leaf(node) && !this.config.titleHeight) return;
+    var pos = node.pos.getc(true), 
+        ctx = canvas.getCtx(),
+        width = node.getData('width'),
+        height = node.getData('height'),
+        x = pos.x + width/2,
+        y = pos.y;
+        
+    ctx.fillText(node.name, x, y, width);
+  }
+});
+
+/*
+ TM.Label.SVG
+
+  Custom extension of <Graph.Label.SVG>.
+
+  Extends:
+
+  All <Graph.Label.SVG> methods
+
+  See also:
+
+  <Graph.Label.SVG>
+*/
+TM.Label.SVG = new Class( {
+  Implements: Graph.Label.SVG,
+
+  initialize: function(viz){
+    this.viz = viz;
+    this.leaf = viz.leaf;
+    this.config = viz.config;
+  },
+
+  /* 
+  placeLabel
+
+  Overrides abstract method placeLabel in <Graph.Plot>.
+
+  Parameters:
+
+  tag - A DOM label element.
+  node - A <Graph.Node>.
+  controller - A configuration/controller object passed to the visualization.
+  
+  */
+  placeLabel: function(tag, node, controller){
+    var pos = node.pos.getc(true), 
+        canvas = this.viz.canvas,
+        ox = canvas.translateOffsetX,
+        oy = canvas.translateOffsetY,
+        sx = canvas.scaleOffsetX,
+        sy = canvas.scaleOffsetY,
+        radius = canvas.getSize();
+    var labelPos = {
+      x: Math.round(pos.x * sx + ox + radius.width / 2),
+      y: Math.round(pos.y * sy + oy + radius.height / 2)
+    };
+    tag.setAttribute('x', labelPos.x);
+    tag.setAttribute('y', labelPos.y);
+
+    if(!this.leaf(node) && !this.config.titleHeight) {
+      tag.style.display = 'none';
+    }
+    controller.onPlaceLabel(tag, node);
+  }
+});
+
+/*
+ TM.Label.HTML
+
+ Custom extension of <Graph.Label.HTML>.
+
+ Extends:
+
+ All <Graph.Label.HTML> methods.
+
+ See also:
+
+ <Graph.Label.HTML>
+
+*/
+TM.Label.HTML = new Class( {
+  Implements: Graph.Label.HTML,
+
+  initialize: function(viz){
+    this.viz = viz;
+    this.leaf = viz.leaf;
+    this.config = viz.config;
+  },
+
+  /* 
+    placeLabel
+  
+    Overrides abstract method placeLabel in <Graph.Plot>.
+  
+    Parameters:
+  
+    tag - A DOM label element.
+    node - A <Graph.Node>.
+    controller - A configuration/controller object passed to the visualization.
+  
+  */
+  placeLabel: function(tag, node, controller){
+    var pos = node.pos.getc(true), 
+        canvas = this.viz.canvas,
+        ox = canvas.translateOffsetX,
+        oy = canvas.translateOffsetY,
+        sx = canvas.scaleOffsetX,
+        sy = canvas.scaleOffsetY,
+        radius = canvas.getSize();
+    var labelPos = {
+      x: Math.round(pos.x * sx + ox + radius.width / 2),
+      y: Math.round(pos.y * sy + oy + radius.height / 2)
+    };
+
+    var style = tag.style;
+    style.left = labelPos.x + 'px';
+    style.top = labelPos.y + 'px';
+    style.width = node.getData('width') * sx + 'px';
+    style.height = node.getData('height') * sy + 'px';
+    style.zIndex = node._depth * 100;
+    style.display = '';
+
+    if(!this.leaf(node) && !this.config.titleHeight) {
+      tag.style.display = 'none';
+    }
+    controller.onPlaceLabel(tag, node);
+  }
+});
+
+/*
+  Class: TM.Plot.NodeTypes
+
+  This class contains a list of <Graph.Node> built-in types. 
+  Node types implemented are 'none', 'rectangle'.
+
+  You can add your custom node types, customizing your visualization to the extreme.
+
+  Example:
+
+  (start code js)
+    TM.Plot.NodeTypes.implement({
+      'mySpecialType': {
+        'render': function(node, canvas) {
+          //print your custom node to canvas
+        },
+        //optional
+        'contains': function(node, pos) {
+          //return true if pos is inside the node or false otherwise
+        }
+      }
+    });
+  (end code)
+
+*/
+TM.Plot.NodeTypes = new Class( {
+  'none': {
+    'render': $.empty
+  },
+
+  'rectangle': {
+    'render': function(node, canvas, animating){
+      var leaf = this.viz.leaf(node),
+          config = this.config,
+          offst = config.offset,
+          titleHeight = config.titleHeight,
+          pos = node.pos.getc(true),
+          width = node.getData('width'),
+          height = node.getData('height'),
+          border = node.getData('border'),
+          ctx = canvas.getCtx(),
+          posx = pos.x + offst / 2, 
+          posy = pos.y + offst / 2;
+      if(width <= offst || height <= offst) return;
+      if (leaf) {
+        if(config.cushion) {
+          var lg = ctx.createRadialGradient(posx + (width-offst)/2, posy + (height-offst)/2, 1, 
+              posx + (width-offst)/2, posy + (height-offst)/2, width < height? height : width);
+          var color = node.getData('color');
+          var colorGrad = $.rgbToHex($.map($.hexToRgb(color), 
+              function(r) { return r * 0.2 >> 0; }));
+          lg.addColorStop(0, color);
+          lg.addColorStop(1, colorGrad);
+          ctx.fillStyle = lg;
+        }
+        ctx.fillRect(posx, posy, width - offst, height - offst);
+        if(border) {
+          ctx.save();
+          ctx.strokeStyle = border;
+          ctx.strokeRect(posx, posy, width - offst, height - offst);
+          ctx.restore();
+        }
+      } else if(titleHeight > 0){
+        ctx.fillRect(pos.x + offst / 2, pos.y + offst / 2, width - offst,
+            titleHeight - offst);
+        if(border) {
+          ctx.save();
+          ctx.strokeStyle = border;
+          ctx.strokeRect(pos.x + offst / 2, pos.y + offst / 2, width - offst,
+              height - offst);
+          ctx.restore();
+        }
+      }
+    },
+    'contains': function(node, pos) {
+      if(this.viz.clickedNode && !node.isDescendantOf(this.viz.clickedNode.id) || node.ignore) return false;
+      var npos = node.pos.getc(true),
+          width = node.getData('width'), 
+          leaf = this.viz.leaf(node),
+          height = leaf? node.getData('height') : this.config.titleHeight;
+      return this.nodeHelper.rectangle.contains({x: npos.x + width/2, y: npos.y + height/2}, pos, width, height);
+    }
+  }
+});
+
+TM.Plot.EdgeTypes = new Class( {
+  'none': $.empty
+});
+
+/*
+  Class: TM.SliceAndDice
+  
+  A slice and dice TreeMap visualization.
+  
+  Implements:
+  
+  All <TM.Base> methods and properties.
+*/
+TM.SliceAndDice = new Class( {
+  Implements: [
+      Loader, Extras, TM.Base, Layouts.TM.SliceAndDice
+  ]
+});
+
+/*
+  Class: TM.Squarified
+  
+  A squarified TreeMap visualization.
+
+  Implements:
+  
+  All <TM.Base> methods and properties.
+*/
+TM.Squarified = new Class( {
+  Implements: [
+      Loader, Extras, TM.Base, Layouts.TM.Squarified
+  ]
+});
+
+/*
+  Class: TM.Strip
+  
+  A strip TreeMap visualization.
+
+  Implements:
+  
+  All <TM.Base> methods and properties.
+*/
+TM.Strip = new Class( {
+  Implements: [
+      Loader, Extras, TM.Base, Layouts.TM.Strip
+  ]
+});
+
+
+/*
+ * File: RGraph.js
+ *
+ */
+
+/*
+   Class: RGraph
+   
+   A radial graph visualization with advanced animations.
+   
+   Inspired by:
+ 
+   Animated Exploration of Dynamic Graphs with Radial Layout (Ka-Ping Yee, Danyel Fisher, Rachna Dhamija, Marti Hearst) <http://bailando.sims.berkeley.edu/papers/infovis01.htm>
+   
+   Note:
+   
+   This visualization was built and engineered from scratch, taking only the paper as inspiration, and only shares some features with the visualization described in the paper.
+   
+  Implements:
+  
+  All <Loader> methods
+  
+   Constructor Options:
+   
+   Inherits options from
+   
+   - <Options.Canvas>
+   - <Options.Controller>
+   - <Options.Node>
+   - <Options.Edge>
+   - <Options.Label>
+   - <Options.Events>
+   - <Options.Tips>
+   - <Options.NodeStyles>
+   - <Options.Navigation>
+   
+   Additionally, there are other parameters and some default values changed
+   
+   interpolation - (string) Default's *linear*. Describes the way nodes are interpolated. Possible values are 'linear' and 'polar'.
+   levelDistance - (number) Default's *100*. The distance between levels of the tree. 
+     
+   Instance Properties:
+
+   canvas - Access a <Canvas> instance.
+   graph - Access a <Graph> instance.
+   op - Access a <RGraph.Op> instance.
+   fx - Access a <RGraph.Plot> instance.
+   labels - Access a <RGraph.Label> interface implementation.   
+*/
+
+$jit.RGraph = new Class( {
+
+  Implements: [
+      Loader, Extras, Layouts.Radial
+  ],
+
+  initialize: function(controller){
+    var $RGraph = $jit.RGraph;
+
+    var config = {
+      interpolation: 'linear',
+      levelDistance: 100
+    };
+
+    this.controller = this.config = $.merge(Options("Canvas", "Node", "Edge",
+        "Fx", "Controller", "Tips", "NodeStyles", "Events", "Navigation", "Label"), config, controller);
+
+    var canvasConfig = this.config;
+    if(canvasConfig.useCanvas) {
+      this.canvas = canvasConfig.useCanvas;
+      this.config.labelContainer = this.canvas.id + '-label';
+    } else {
+      if(canvasConfig.background) {
+        canvasConfig.background = $.merge({
+          type: 'Circles'
+        }, canvasConfig.background);
+      }
+      this.canvas = new Canvas(this, canvasConfig);
+      this.config.labelContainer = (typeof canvasConfig.injectInto == 'string'? canvasConfig.injectInto : canvasConfig.injectInto.id) + '-label';
+    }
+
+    this.graphOptions = {
+      'complex': false,
+      'Node': {
+        'selected': false,
+        'exist': true,
+        'drawn': true
+      }
+    };
+    this.graph = new Graph(this.graphOptions, this.config.Node,
+        this.config.Edge);
+    this.labels = new $RGraph.Label[canvasConfig.Label.type](this);
+    this.fx = new $RGraph.Plot(this, $RGraph);
+    this.op = new $RGraph.Op(this);
+    this.json = null;
+    this.root = null;
+    this.busy = false;
+    this.parent = false;
+    // initialize extras
+    this.initializeExtras();
+  },
+
+  /* 
+  
+    createLevelDistanceFunc 
+  
+    Returns the levelDistance function used for calculating a node distance 
+    to its origin. This function returns a function that is computed 
+    per level and not per node, such that all nodes with the same depth will have the 
+    same distance to the origin. The resulting function gets the 
+    parent node as parameter and returns a float.
+
+   */
+  createLevelDistanceFunc: function(){
+    var ld = this.config.levelDistance;
+    return function(elem){
+      return (elem._depth + 1) * ld;
+    };
+  },
+
+  /* 
+     Method: refresh 
+     
+     Computes positions and plots the tree.
+
+   */
+  refresh: function(){
+    this.compute();
+    this.plot();
+  },
+
+  reposition: function(){
+    this.compute('end');
+  },
+
+  /*
+   Method: plot
+  
+   Plots the RGraph. This is a shortcut to *fx.plot*.
+  */
+  plot: function(){
+    this.fx.plot();
+  },
+  /*
+   getNodeAndParentAngle
+  
+   Returns the _parent_ of the given node, also calculating its angle span.
+  */
+  getNodeAndParentAngle: function(id){
+    var theta = false;
+    var n = this.graph.getNode(id);
+    var ps = n.getParents();
+    var p = (ps.length > 0)? ps[0] : false;
+    if (p) {
+      var posParent = p.pos.getc(), posChild = n.pos.getc();
+      var newPos = posParent.add(posChild.scale(-1));
+      theta = Math.atan2(newPos.y, newPos.x);
+      if (theta < 0)
+        theta += 2 * Math.PI;
+    }
+    return {
+      parent: p,
+      theta: theta
+    };
+  },
+  /*
+   tagChildren
+  
+   Enumerates the children in order to maintain child ordering (second constraint of the paper).
+  */
+  tagChildren: function(par, id){
+    if (par.angleSpan) {
+      var adjs = [];
+      par.eachAdjacency(function(elem){
+        adjs.push(elem.nodeTo);
+      }, "ignore");
+      var len = adjs.length;
+      for ( var i = 0; i < len && id != adjs[i].id; i++)
+        ;
+      for ( var j = (i + 1) % len, k = 0; id != adjs[j].id; j = (j + 1) % len) {
+        adjs[j].dist = k++;
+      }
+    }
+  },
+  /* 
+  Method: onClick 
+  
+  Animates the <RGraph> to center the node specified by *id*.
+
+   Parameters:
+
+   id - A <Graph.Node> id.
+   opt - (optional|object) An object containing some extra properties described below
+   hideLabels - (boolean) Default's *true*. Hide labels when performing the animation.
+
+   Example:
+
+   (start code js)
+     rgraph.onClick('someid');
+     //or also...
+     rgraph.onClick('someid', {
+      hideLabels: false
+     });
+    (end code)
+    
+  */
+  onClick: function(id, opt){
+    if (this.root != id && !this.busy) {
+      this.busy = true;
+      this.root = id;
+      that = this;
+      this.controller.onBeforeCompute(this.graph.getNode(id));
+      var obj = this.getNodeAndParentAngle(id);
+
+      // second constraint
+      this.tagChildren(obj.parent, id);
+      this.parent = obj.parent;
+      this.compute('end');
+
+      // first constraint
+      var thetaDiff = obj.theta - obj.parent.endPos.theta;
+      this.graph.eachNode(function(elem){
+        elem.endPos.set(elem.endPos.getp().add($P(thetaDiff, 0)));
+      });
+
+      var mode = this.config.interpolation;
+      opt = $.merge( {
+        onComplete: $.empty
+      }, opt || {});
+
+      this.fx.animate($.merge( {
+        hideLabels: true,
+        modes: [
+          mode
+        ]
+      }, opt, {
+        onComplete: function(){
+          that.busy = false;
+          opt.onComplete();
+        }
+      }));
+    }
+  }
+});
+
+$jit.RGraph.$extend = true;
+
+(function(RGraph){
+
+  /*
+     Class: RGraph.Op
+     
+     Custom extension of <Graph.Op>.
+
+     Extends:
+
+     All <Graph.Op> methods
+     
+     See also:
+     
+     <Graph.Op>
+
+  */
+  RGraph.Op = new Class( {
+
+    Implements: Graph.Op
+
+  });
+
+  /*
+     Class: RGraph.Plot
+    
+    Custom extension of <Graph.Plot>.
+  
+    Extends:
+  
+    All <Graph.Plot> methods
+    
+    See also:
+    
+    <Graph.Plot>
+  
+  */
+  RGraph.Plot = new Class( {
+
+    Implements: Graph.Plot
+
+  });
+
+  /*
+    Object: RGraph.Label
+
+    Custom extension of <Graph.Label>. 
+    Contains custom <Graph.Label.SVG>, <Graph.Label.HTML> and <Graph.Label.Native> extensions.
+  
+    Extends:
+  
+    All <Graph.Label> methods and subclasses.
+  
+    See also:
+  
+    <Graph.Label>, <Graph.Label.Native>, <Graph.Label.HTML>, <Graph.Label.SVG>.
+  
+   */
+  RGraph.Label = {};
+
+  /*
+     RGraph.Label.Native
+
+     Custom extension of <Graph.Label.Native>.
+
+     Extends:
+
+     All <Graph.Label.Native> methods
+
+     See also:
+
+     <Graph.Label.Native>
+
+  */
+  RGraph.Label.Native = new Class( {
+    Implements: Graph.Label.Native
+  });
+
+  /*
+     RGraph.Label.SVG
+    
+    Custom extension of <Graph.Label.SVG>.
+  
+    Extends:
+  
+    All <Graph.Label.SVG> methods
+  
+    See also:
+  
+    <Graph.Label.SVG>
+  
+  */
+  RGraph.Label.SVG = new Class( {
+    Implements: Graph.Label.SVG,
+
+    initialize: function(viz){
+      this.viz = viz;
+    },
+
+    /* 
+       placeLabel
+
+       Overrides abstract method placeLabel in <Graph.Plot>.
+
+       Parameters:
+
+       tag - A DOM label element.
+       node - A <Graph.Node>.
+       controller - A configuration/controller object passed to the visualization.
+      
+     */
+    placeLabel: function(tag, node, controller){
+      var pos = node.pos.getc(true), 
+          canvas = this.viz.canvas,
+          ox = canvas.translateOffsetX,
+          oy = canvas.translateOffsetY,
+          sx = canvas.scaleOffsetX,
+          sy = canvas.scaleOffsetY,
+          radius = canvas.getSize();
+      var labelPos = {
+        x: Math.round(pos.x * sx + ox + radius.width / 2),
+        y: Math.round(pos.y * sy + oy + radius.height / 2)
+      };
+      tag.setAttribute('x', labelPos.x);
+      tag.setAttribute('y', labelPos.y);
+
+      controller.onPlaceLabel(tag, node);
+    }
+  });
+
+  /*
+     RGraph.Label.HTML
+
+     Custom extension of <Graph.Label.HTML>.
+
+     Extends:
+
+     All <Graph.Label.HTML> methods.
+
+     See also:
+
+     <Graph.Label.HTML>
+
+  */
+  RGraph.Label.HTML = new Class( {
+    Implements: Graph.Label.HTML,
+
+    initialize: function(viz){
+      this.viz = viz;
+    },
+    /* 
+       placeLabel
+
+       Overrides abstract method placeLabel in <Graph.Plot>.
+
+       Parameters:
+
+       tag - A DOM label element.
+       node - A <Graph.Node>.
+       controller - A configuration/controller object passed to the visualization.
+      
+     */
+    placeLabel: function(tag, node, controller){
+      var pos = node.pos.getc(true), 
+          canvas = this.viz.canvas,
+          ox = canvas.translateOffsetX,
+          oy = canvas.translateOffsetY,
+          sx = canvas.scaleOffsetX,
+          sy = canvas.scaleOffsetY,
+          radius = canvas.getSize();
+      var labelPos = {
+        x: Math.round(pos.x * sx + ox + radius.width / 2),
+        y: Math.round(pos.y * sy + oy + radius.height / 2)
+      };
+
+      var style = tag.style;
+      style.left = labelPos.x + 'px';
+      style.top = labelPos.y + 'px';
+      style.display = this.fitsInCanvas(labelPos, canvas)? '' : 'none';
+
+      controller.onPlaceLabel(tag, node);
+    }
+  });
+
+  /*
+    Class: RGraph.Plot.NodeTypes
+
+    This class contains a list of <Graph.Node> built-in types. 
+    Node types implemented are 'none', 'circle', 'triangle', 'rectangle', 'star', 'ellipse' and 'square'.
+
+    You can add your custom node types, customizing your visualization to the extreme.
+
+    Example:
+
+    (start code js)
+      RGraph.Plot.NodeTypes.implement({
+        'mySpecialType': {
+          'render': function(node, canvas) {
+            //print your custom node to canvas
+          },
+          //optional
+          'contains': function(node, pos) {
+            //return true if pos is inside the node or false otherwise
+          }
+        }
+      });
+    (end code)
+
+  */
+  RGraph.Plot.NodeTypes = new Class({
+    'none': {
+      'render': $.empty,
+      'contains': $.lambda(false)
+    },
+    'circle': {
+      'render': function(node, canvas){
+        var pos = node.pos.getc(true), 
+            dim = node.getData('dim');
+        this.nodeHelper.circle.render('fill', pos, dim, canvas);
+      },
+      'contains': function(node, pos){
+        var npos = node.pos.getc(true), 
+            dim = node.getData('dim');
+        return this.nodeHelper.circle.contains(npos, pos, dim);
+      }
+    },
+    'ellipse': {
+      'render': function(node, canvas){
+        var pos = node.pos.getc(true), 
+            width = node.getData('width'), 
+            height = node.getData('height');
+        this.nodeHelper.ellipse.render('fill', pos, width, height, canvas);
+        },
+      // TODO(nico): be more precise...
+      'contains': function(node, pos){
+        var npos = node.pos.getc(true), 
+            width = node.getData('width'), 
+            height = node.getData('height');
+        return this.nodeHelper.ellipse.contains(npos, pos, width, height);
+      }
+    },
+    'square': {
+      'render': function(node, canvas){
+        var pos = node.pos.getc(true), 
+            dim = node.getData('dim');
+        this.nodeHelper.square.render('fill', pos, dim, canvas);
+      },
+      'contains': function(node, pos){
+        var npos = node.pos.getc(true), 
+            dim = node.getData('dim');
+        return this.nodeHelper.square.contains(npos, pos, dim);
+      }
+    },
+    'rectangle': {
+      'render': function(node, canvas){
+        var pos = node.pos.getc(true), 
+            width = node.getData('width'), 
+            height = node.getData('height');
+        this.nodeHelper.rectangle.render('fill', pos, width, height, canvas);
+      },
+      'contains': function(node, pos){
+        var npos = node.pos.getc(true), 
+            width = node.getData('width'), 
+            height = node.getData('height');
+        return this.nodeHelper.rectangle.contains(npos, pos, width, height);
+      }
+    },
+    'triangle': {
+      'render': function(node, canvas){
+        var pos = node.pos.getc(true), 
+            dim = node.getData('dim');
+        this.nodeHelper.triangle.render('fill', pos, dim, canvas);
+      },
+      'contains': function(node, pos) {
+        var npos = node.pos.getc(true), 
+            dim = node.getData('dim');
+        return this.nodeHelper.triangle.contains(npos, pos, dim);
+      }
+    },
+    'star': {
+      'render': function(node, canvas){
+        var pos = node.pos.getc(true),
+            dim = node.getData('dim');
+        this.nodeHelper.star.render('fill', pos, dim, canvas);
+      },
+      'contains': function(node, pos) {
+        var npos = node.pos.getc(true),
+            dim = node.getData('dim');
+        return this.nodeHelper.star.contains(npos, pos, dim);
+      }
+    }
+  });
+
+  /*
+    Class: RGraph.Plot.EdgeTypes
+
+    This class contains a list of <Graph.Adjacence> built-in types. 
+    Edge types implemented are 'none', 'line' and 'arrow'.
+  
+    You can add your custom edge types, customizing your visualization to the extreme.
+  
+    Example:
+  
+    (start code js)
+      RGraph.Plot.EdgeTypes.implement({
+        'mySpecialType': {
+          'render': function(adj, canvas) {
+            //print your custom edge to canvas
+          },
+          //optional
+          'contains': function(adj, pos) {
+            //return true if pos is inside the arc or false otherwise
+          }
+        }
+      });
+    (end code)
+  
+  */
+  RGraph.Plot.EdgeTypes = new Class({
+    'none': $.empty,
+    'line': {
+      'render': function(adj, canvas) {
+        var from = adj.nodeFrom.pos.getc(true),
+            to = adj.nodeTo.pos.getc(true);
+        this.edgeHelper.line.render(from, to, canvas);
+      },
+      'contains': function(adj, pos) {
+        var from = adj.nodeFrom.pos.getc(true),
+            to = adj.nodeTo.pos.getc(true);
+        return this.edgeHelper.line.contains(from, to, pos, this.edge.epsilon);
+      }
+    },
+    'arrow': {
+      'render': function(adj, canvas) {
+        var from = adj.nodeFrom.pos.getc(true),
+            to = adj.nodeTo.pos.getc(true),
+            dim = adj.getData('dim'),
+            direction = adj.data.$direction,
+            inv = (direction && direction.length>1 && direction[0] != adj.nodeFrom.id);
+        this.edgeHelper.arrow.render(from, to, dim, inv, canvas);
+      },
+      'contains': function(adj, pos) {
+        var from = adj.nodeFrom.pos.getc(true),
+            to = adj.nodeTo.pos.getc(true);
+        return this.edgeHelper.arrow.contains(from, to, pos, this.edge.epsilon);
+      }
+    }
+  });
+
+})($jit.RGraph);
+
+
+/*
+ * File: Hypertree.js
+ * 
+*/
+
+/* 
+     Complex 
+     
+     A multi-purpose Complex Class with common methods. Extended for the Hypertree. 
+ 
+*/
+/* 
+   moebiusTransformation 
+ 
+   Calculates a moebius transformation for this point / complex. 
+    For more information go to: 
+        http://en.wikipedia.org/wiki/Moebius_transformation. 
+ 
+   Parameters: 
+ 
+      c - An initialized Complex instance representing a translation Vector. 
+*/
+
+Complex.prototype.moebiusTransformation = function(c) {
+  var num = this.add(c);
+  var den = c.$conjugate().$prod(this);
+  den.x++;
+  return num.$div(den);
+};
+
+/* 
+    moebiusTransformation 
+     
+    Calculates a moebius transformation for the hyperbolic tree. 
+     
+    <http://en.wikipedia.org/wiki/Moebius_transformation> 
+      
+     Parameters: 
+     
+        graph - A <Graph> instance.
+        pos - A <Complex>.
+        prop - A property array.
+        theta - Rotation angle. 
+        startPos - _optional_ start position. 
+*/
+Graph.Util.moebiusTransformation = function(graph, pos, prop, startPos, flags) {
+  this.eachNode(graph, function(elem) {
+    for ( var i = 0; i < prop.length; i++) {
+      var p = pos[i].scale(-1), property = startPos ? startPos : prop[i];
+      elem.getPos(prop[i]).set(elem.getPos(property).getc().moebiusTransformation(p));
+    }
+  }, flags);
+};
+
+/* 
+   Class: Hypertree 
+   
+   A Hyperbolic Tree/Graph visualization.
+   
+   Inspired by:
+ 
+   A Focus+Context Technique Based on Hyperbolic Geometry for Visualizing Large Hierarchies (John Lamping, Ramana Rao, and Peter Pirolli). 
+   <http://www.cs.tau.ac.il/~asharf/shrek/Projects/HypBrowser/startree-chi95.pdf>
+ 
+  Note:
+ 
+  This visualization was built and engineered from scratch, taking only the paper as inspiration, and only shares some features with the Hypertree described in the paper.
+
+  Implements:
+  
+  All <Loader> methods
+  
+  Constructor Options:
+  
+  Inherits options from
+  
+  - <Options.Canvas>
+  - <Options.Controller>
+  - <Options.Node>
+  - <Options.Edge>
+  - <Options.Label>
+  - <Options.Events>
+  - <Options.Tips>
+  - <Options.NodeStyles>
+  - <Options.Navigation>
+  
+  Additionally, there are other parameters and some default values changed
+  
+  radius - (string|number) Default's *auto*. The radius of the disc to plot the <Hypertree> in. 'auto' will take the smaller value from the width and height canvas dimensions. You can also set this to a custom value, for example *250*.
+  offset - (number) Default's *0*. A number in the range [0, 1) that will be substracted to each node position to make a more compact <Hypertree>. This will avoid placing nodes too far from each other when a there's a selected node.
+  fps - Described in <Options.Fx>. It's default value has been changed to *35*.
+  duration - Described in <Options.Fx>. It's default value has been changed to *1500*.
+  Edge.type - Described in <Options.Edge>. It's default value has been changed to *hyperline*. 
+  
+  Instance Properties:
+  
+  canvas - Access a <Canvas> instance.
+  graph - Access a <Graph> instance.
+  op - Access a <Hypertree.Op> instance.
+  fx - Access a <Hypertree.Plot> instance.
+  labels - Access a <Hypertree.Label> interface implementation.
+
+*/
+
+$jit.Hypertree = new Class( {
+
+  Implements: [ Loader, Extras, Layouts.Radial ],
+
+  initialize: function(controller) {
+    var $Hypertree = $jit.Hypertree;
+
+    var config = {
+      radius: "auto",
+      offset: 0,
+      Edge: {
+        type: 'hyperline'
+      },
+      duration: 1500,
+      fps: 35
+    };
+    this.controller = this.config = $.merge(Options("Canvas", "Node", "Edge",
+        "Fx", "Tips", "NodeStyles", "Events", "Navigation", "Controller", "Label"), config, controller);
+
+    var canvasConfig = this.config;
+    if(canvasConfig.useCanvas) {
+      this.canvas = canvasConfig.useCanvas;
+      this.config.labelContainer = this.canvas.id + '-label';
+    } else {
+      if(canvasConfig.background) {
+        canvasConfig.background = $.merge({
+          type: 'Circles'
+        }, canvasConfig.background);
+      }
+      this.canvas = new Canvas(this, canvasConfig);
+      this.config.labelContainer = (typeof canvasConfig.injectInto == 'string'? canvasConfig.injectInto : canvasConfig.injectInto.id) + '-label';
+    }
+
+    this.graphOptions = {
+      'complex': false,
+      'Node': {
+        'selected': false,
+        'exist': true,
+        'drawn': true
+      }
+    };
+    this.graph = new Graph(this.graphOptions, this.config.Node,
+        this.config.Edge);
+    this.labels = new $Hypertree.Label[canvasConfig.Label.type](this);
+    this.fx = new $Hypertree.Plot(this, $Hypertree);
+    this.op = new $Hypertree.Op(this);
+    this.json = null;
+    this.root = null;
+    this.busy = false;
+    // initialize extras
+    this.initializeExtras();
+  },
+
+  /* 
+  
+  createLevelDistanceFunc 
+
+  Returns the levelDistance function used for calculating a node distance 
+  to its origin. This function returns a function that is computed 
+  per level and not per node, such that all nodes with the same depth will have the 
+  same distance to the origin. The resulting function gets the 
+  parent node as parameter and returns a float.
+
+  */
+  createLevelDistanceFunc: function() {
+    // get max viz. length.
+    var r = this.getRadius();
+    // get max depth.
+    var depth = 0, max = Math.max, config = this.config;
+    this.graph.eachNode(function(node) {
+      depth = max(node._depth, depth);
+    }, "ignore");
+    depth++;
+    // node distance generator
+    var genDistFunc = function(a) {
+      return function(node) {
+        node.scale = r;
+        var d = node._depth + 1;
+        var acum = 0, pow = Math.pow;
+        while (d) {
+          acum += pow(a, d--);
+        }
+        return acum - config.offset;
+      };
+    };
+    // estimate better edge length.
+    for ( var i = 0.51; i <= 1; i += 0.01) {
+      var valSeries = (1 - Math.pow(i, depth)) / (1 - i);
+      if (valSeries >= 2) { return genDistFunc(i - 0.01); }
+    }
+    return genDistFunc(0.75);
+  },
+
+  /* 
+    Method: getRadius 
+    
+    Returns the current radius of the visualization. If *config.radius* is *auto* then it 
+    calculates the radius by taking the smaller size of the <Canvas> widget.
+    
+    See also:
+    
+    <Canvas.getSize>
+   
+  */
+  getRadius: function() {
+    var rad = this.config.radius;
+    if (rad !== "auto") { return rad; }
+    var s = this.canvas.getSize();
+    return Math.min(s.width, s.height) / 2;
+  },
+
+  /* 
+    Method: refresh 
+    
+    Computes positions and plots the tree.
+
+    Parameters:
+
+    reposition - (optional|boolean) Set this to *true* to force all positions (current, start, end) to match.
+
+   */
+  refresh: function(reposition) {
+    if (reposition) {
+      this.reposition();
+      this.graph.eachNode(function(node) {
+        node.startPos.rho = node.pos.rho = node.endPos.rho;
+        node.startPos.theta = node.pos.theta = node.endPos.theta;
+      });
+    } else {
+      this.compute();
+    }
+    this.plot();
+  },
+
+  /* 
+   reposition 
+   
+   Computes nodes' positions and restores the tree to its previous position.
+
+   For calculating nodes' positions the root must be placed on its origin. This method does this 
+     and then attemps to restore the hypertree to its previous position.
+    
+  */
+  reposition: function() {
+    this.compute('end');
+    var vector = this.graph.getNode(this.root).pos.getc().scale(-1);
+    Graph.Util.moebiusTransformation(this.graph, [ vector ], [ 'end' ],
+        'end', "ignore");
+    this.graph.eachNode(function(node) {
+      if (node.ignore) {
+        node.endPos.rho = node.pos.rho;
+        node.endPos.theta = node.pos.theta;
+      }
+    });
+  },
+
+  /* 
+   Method: plot 
+   
+   Plots the <Hypertree>. This is a shortcut to *fx.plot*. 
+
+  */
+  plot: function() {
+    this.fx.plot();
+  },
+
+  /* 
+   Method: onClick 
+   
+   Animates the <Hypertree> to center the node specified by *id*.
+
+   Parameters:
+
+   id - A <Graph.Node> id.
+   opt - (optional|object) An object containing some extra properties described below
+   hideLabels - (boolean) Default's *true*. Hide labels when performing the animation.
+
+   Example:
+
+   (start code js)
+     ht.onClick('someid');
+     //or also...
+     ht.onClick('someid', {
+      hideLabels: false
+     });
+    (end code)
+    
+  */
+  onClick: function(id, opt) {
+    var pos = this.graph.getNode(id).pos.getc(true);
+    this.move(pos, opt);
+  },
+
+  /* 
+   Method: move 
+
+   Translates the tree to the given position. 
+
+   Parameters:
+
+   pos - (object) A *x, y* coordinate object where x, y in [0, 1), to move the tree to.
+   opt - This object has been defined in <Hypertree.onClick>
+   
+   Example:
+   
+   (start code js)
+     ht.move({ x: 0, y: 0.7 }, {
+       hideLabels: false
+     });
+   (end code)
+
+  */
+  move: function(pos, opt) {
+    var versor = $C(pos.x, pos.y);
+    if (this.busy === false && versor.norm() < 1) {
+      this.busy = true;
+      var root = this.graph.getClosestNodeToPos(versor), that = this;
+      this.graph.computeLevels(root.id, 0);
+      this.controller.onBeforeCompute(root);
+      opt = $.merge( {
+        onComplete: $.empty
+      }, opt || {});
+      this.fx.animate($.merge( {
+        modes: [ 'moebius' ],
+        hideLabels: true
+      }, opt, {
+        onComplete: function() {
+          that.busy = false;
+          opt.onComplete();
+        }
+      }), versor);
+    }
+  }
+});
+
+$jit.Hypertree.$extend = true;
+
+(function(Hypertree) {
+
+  /* 
+     Class: Hypertree.Op 
+   
+     Custom extension of <Graph.Op>.
+
+     Extends:
+
+     All <Graph.Op> methods
+     
+     See also:
+     
+     <Graph.Op>
+
+  */
+  Hypertree.Op = new Class( {
+
+    Implements: Graph.Op
+
+  });
+
+  /* 
+     Class: Hypertree.Plot 
+   
+    Custom extension of <Graph.Plot>.
+  
+    Extends:
+  
+    All <Graph.Plot> methods
+    
+    See also:
+    
+    <Graph.Plot>
+  
+  */
+  Hypertree.Plot = new Class( {
+
+    Implements: Graph.Plot
+
+  });
+
+  /*
+    Object: Hypertree.Label
+
+    Custom extension of <Graph.Label>. 
+    Contains custom <Graph.Label.SVG>, <Graph.Label.HTML> and <Graph.Label.Native> extensions.
+  
+    Extends:
+  
+    All <Graph.Label> methods and subclasses.
+  
+    See also:
+  
+    <Graph.Label>, <Graph.Label.Native>, <Graph.Label.HTML>, <Graph.Label.SVG>.
+
+   */
+  Hypertree.Label = {};
+
+  /*
+     Hypertree.Label.Native
+
+     Custom extension of <Graph.Label.Native>.
+
+     Extends:
+
+     All <Graph.Label.Native> methods
+
+     See also:
+
+     <Graph.Label.Native>
+
+  */
+  Hypertree.Label.Native = new Class( {
+    Implements: Graph.Label.Native,
+
+    initialize: function(viz) {
+      this.viz = viz;
+    },
+
+    renderLabel: function(canvas, node, controller) {
+      var ctx = canvas.getCtx();
+      var coord = node.pos.getc(true);
+      var s = this.viz.getRadius();
+      ctx.fillText(node.name, coord.x * s, coord.y * s);
+    }
+  });
+
+  /*
+     Hypertree.Label.SVG
+
+    Custom extension of <Graph.Label.SVG>.
+  
+    Extends:
+  
+    All <Graph.Label.SVG> methods
+  
+    See also:
+  
+    <Graph.Label.SVG>
+  
+  */
+  Hypertree.Label.SVG = new Class( {
+    Implements: Graph.Label.SVG,
+
+    initialize: function(viz) {
+      this.viz = viz;
+    },
+
+    /* 
+       placeLabel
+
+       Overrides abstract method placeLabel in <Graph.Plot>.
+
+       Parameters:
+
+       tag - A DOM label element.
+       node - A <Graph.Node>.
+       controller - A configuration/controller object passed to the visualization.
+      
+     */
+    placeLabel: function(tag, node, controller) {
+      var pos = node.pos.getc(true), 
+          canvas = this.viz.canvas,
+          ox = canvas.translateOffsetX,
+          oy = canvas.translateOffsetY,
+          sx = canvas.scaleOffsetX,
+          sy = canvas.scaleOffsetY,
+          radius = canvas.getSize(),
+          r = this.viz.getRadius();
+      var labelPos = {
+        x: Math.round((pos.x * sx) * r + ox + radius.width / 2),
+        y: Math.round((pos.y * sy) * r + oy + radius.height / 2)
+      };
+      tag.setAttribute('x', labelPos.x);
+      tag.setAttribute('y', labelPos.y);
+      controller.onPlaceLabel(tag, node);
+    }
+  });
+
+  /*
+     Hypertree.Label.HTML
+
+     Custom extension of <Graph.Label.HTML>.
+
+     Extends:
+
+     All <Graph.Label.HTML> methods.
+
+     See also:
+
+     <Graph.Label.HTML>
+
+  */
+  Hypertree.Label.HTML = new Class( {
+    Implements: Graph.Label.HTML,
+
+    initialize: function(viz) {
+      this.viz = viz;
+    },
+    /* 
+       placeLabel
+
+       Overrides abstract method placeLabel in <Graph.Plot>.
+
+       Parameters:
+
+       tag - A DOM label element.
+       node - A <Graph.Node>.
+       controller - A configuration/controller object passed to the visualization.
+      
+     */
+    placeLabel: function(tag, node, controller) {
+      var pos = node.pos.getc(true), 
+          canvas = this.viz.canvas,
+          ox = canvas.translateOffsetX,
+          oy = canvas.translateOffsetY,
+          sx = canvas.scaleOffsetX,
+          sy = canvas.scaleOffsetY,
+          radius = canvas.getSize(),
+          r = this.viz.getRadius();
+      var labelPos = {
+        x: Math.round((pos.x * sx) * r + ox + radius.width / 2),
+        y: Math.round((pos.y * sy) * r + oy + radius.height / 2)
+      };
+      var style = tag.style;
+      style.left = labelPos.x + 'px';
+      style.top = labelPos.y + 'px';
+      style.display = this.fitsInCanvas(labelPos, canvas) ? '' : 'none';
+
+      controller.onPlaceLabel(tag, node);
+    }
+  });
+
+  /*
+    Class: Hypertree.Plot.NodeTypes
+
+    This class contains a list of <Graph.Node> built-in types. 
+    Node types implemented are 'none', 'circle', 'triangle', 'rectangle', 'star', 'ellipse' and 'square'.
+
+    You can add your custom node types, customizing your visualization to the extreme.
+
+    Example:
+
+    (start code js)
+      Hypertree.Plot.NodeTypes.implement({
+        'mySpecialType': {
+          'render': function(node, canvas) {
+            //print your custom node to canvas
+          },
+          //optional
+          'contains': function(node, pos) {
+            //return true if pos is inside the node or false otherwise
+          }
+        }
+      });
+    (end code)
+
+  */
+  Hypertree.Plot.NodeTypes = new Class({
+    'none': {
+      'render': $.empty,
+      'contains': $.lambda(false)
+    },
+    'circle': {
+      'render': function(node, canvas) {
+        var nconfig = this.node,
+            dim = node.getData('dim'),
+            p = node.pos.getc();
+        dim = nconfig.transform? dim * (1 - p.squaredNorm()) : dim;
+        p.$scale(node.scale);
+        if (dim > 0.2) {
+          this.nodeHelper.circle.render('fill', p, dim, canvas);
+        }
+      },
+      'contains': function(node, pos) {
+        var dim = node.getData('dim'),
+            npos = node.pos.getc().$scale(node.scale);
+        return this.nodeHelper.circle.contains(npos, pos, dim);
+      }
+    },
+    'ellipse': {
+      'render': function(node, canvas) {
+        var pos = node.pos.getc().$scale(node.scale),
+            width = node.getData('width'),
+            height = node.getData('height');
+        this.nodeHelper.ellipse.render('fill', pos, width, height, canvas);
+      },
+      'contains': function(node, pos) {
+        var width = node.getData('width'),
+            height = node.getData('height'),
+            npos = node.pos.getc().$scale(node.scale);
+        return this.nodeHelper.circle.contains(npos, pos, width, height);
+      }
+    },
+    'square': {
+      'render': function(node, canvas) {
+        var nconfig = this.node,
+            dim = node.getData('dim'),
+            p = node.pos.getc();
+        dim = nconfig.transform? dim * (1 - p.squaredNorm()) : dim;
+        p.$scale(node.scale);
+        if (dim > 0.2) {
+          this.nodeHelper.square.render('fill', p, dim, canvas);
+        }
+      },
+      'contains': function(node, pos) {
+        var dim = node.getData('dim'),
+            npos = node.pos.getc().$scale(node.scale);
+        return this.nodeHelper.square.contains(npos, pos, dim);
+      }
+    },
+    'rectangle': {
+      'render': function(node, canvas) {
+        var nconfig = this.node,
+            width = node.getData('width'),
+            height = node.getData('height'),
+            pos = node.pos.getc();
+        width = nconfig.transform? width * (1 - pos.squaredNorm()) : width;
+        height = nconfig.transform? height * (1 - pos.squaredNorm()) : height;
+        pos.$scale(node.scale);
+        if (width > 0.2 && height > 0.2) {
+          this.nodeHelper.rectangle.render('fill', pos, width, height, canvas);
+        }
+      },
+      'contains': function(node, pos) {
+        var width = node.getData('width'),
+            height = node.getData('height'),
+            npos = node.pos.getc().$scale(node.scale);
+        return this.nodeHelper.square.contains(npos, pos, width, height);
+      }
+    },
+    'triangle': {
+      'render': function(node, canvas) {
+        var nconfig = this.node,
+            dim = node.getData('dim'),
+            p = node.pos.getc();
+        dim = nconfig.transform? dim * (1 - p.squaredNorm()) : dim;
+        p.$scale(node.scale);
+        if (dim > 0.2) {
+          this.nodeHelper.triangle.render('fill', p, dim, canvas);
+        }
+      },
+      'contains': function(node, pos) {
+        var dim = node.getData('dim'),
+            npos = node.pos.getc().$scale(node.scale);
+        return this.nodeHelper.triangle.contains(npos, pos, dim);
+      }
+    },
+    'star': {
+      'render': function(node, canvas) {
+        var nconfig = this.node,
+            dim = node.getData('dim'),
+            p = node.pos.getc();
+        dim = nconfig.transform? dim * (1 - p.squaredNorm()) : dim;
+        p.$scale(node.scale);
+        if (dim > 0.2) {
+          this.nodeHelper.star.render('fill', p, dim, canvas);
+        }
+      },
+      'contains': function(node, pos) {
+        var dim = node.getData('dim'),
+            npos = node.pos.getc().$scale(node.scale);
+        return this.nodeHelper.star.contains(npos, pos, dim);
+      }
+    }
+  });
+
+  /*
+   Class: Hypertree.Plot.EdgeTypes
+
+    This class contains a list of <Graph.Adjacence> built-in types. 
+    Edge types implemented are 'none', 'line', 'arrow' and 'hyperline'.
+  
+    You can add your custom edge types, customizing your visualization to the extreme.
+  
+    Example:
+  
+    (start code js)
+      Hypertree.Plot.EdgeTypes.implement({
+        'mySpecialType': {
+          'render': function(adj, canvas) {
+            //print your custom edge to canvas
+          },
+          //optional
+          'contains': function(adj, pos) {
+            //return true if pos is inside the arc or false otherwise
+          }
+        }
+      });
+    (end code)
+  
+  */
+  Hypertree.Plot.EdgeTypes = new Class({
+    'none': $.empty,
+    'line': {
+      'render': function(adj, canvas) {
+        var from = adj.nodeFrom.pos.getc(true),
+          to = adj.nodeTo.pos.getc(true),
+          r = adj.nodeFrom.scale;
+          this.edgeHelper.line.render({x:from.x*r, y:from.y*r}, {x:to.x*r, y:to.y*r}, canvas);
+      },
+      'contains': function(adj, pos) {
+        var from = adj.nodeFrom.pos.getc(true),
+            to = adj.nodeTo.pos.getc(true),
+            r = adj.nodeFrom.scale;
+            this.edgeHelper.line.contains({x:from.x*r, y:from.y*r}, {x:to.x*r, y:to.y*r}, pos, this.edge.epsilon);
+      }
+    },
+    'arrow': {
+      'render': function(adj, canvas) {
+        var from = adj.nodeFrom.pos.getc(true),
+            to = adj.nodeTo.pos.getc(true),
+            r = adj.nodeFrom.scale,
+            dim = adj.getData('dim'),
+            direction = adj.data.$direction,
+            inv = (direction && direction.length>1 && direction[0] != adj.nodeFrom.id);
+        this.edgeHelper.arrow.render({x:from.x*r, y:from.y*r}, {x:to.x*r, y:to.y*r}, dim, inv, canvas);
+      },
+      'contains': function(adj, pos) {
+        var from = adj.nodeFrom.pos.getc(true),
+            to = adj.nodeTo.pos.getc(true),
+            r = adj.nodeFrom.scale;
+        this.edgeHelper.arrow.contains({x:from.x*r, y:from.y*r}, {x:to.x*r, y:to.y*r}, pos, this.edge.epsilon);
+      }
+    },
+    'hyperline': {
+      'render': function(adj, canvas) {
+        var from = adj.nodeFrom.pos.getc(),
+            to = adj.nodeTo.pos.getc(),
+            dim = this.viz.getRadius();
+        this.edgeHelper.hyperline.render(from, to, dim, canvas);
+      },
+      'contains': $.lambda(false)
+    }
+  });
+
+})($jit.Hypertree);
+
+
+
+
+ })();
\ No newline at end of file