Commits

anatoly techtonik committed c99a768

Add graph structure playground.

Comments (0)

Files changed (5)

graphs/index.html

+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Graph visualization tool in JavaScript</title>
+    <style>
+/* -- two column fluid layout */
+.content:before,
+.content:after {
+    content: " "; /* 1 */
+    display: table; /* 2 */
+}
+.content:after {
+    clear:both;
+}
+
+/* [ ] resize with JavaScript to 70% or depending on
+       width/height screen ratio */
+.canvas {
+    float: left;
+    width: 640px;
+    margin-left: 2%;
+    min-width: 20em;
+    border: 1px solid #AAA;
+}
+
+.graphtext {
+    float: left;
+    margin: auto 2%;
+    min-width: 20em;
+}
+/* /- two column fluid layout */
+
+.graphtext > textarea {
+    width: 100%;
+    margin: 0;
+}
+    </style>
+
+    <script src="jquery-1.3.2.min.js"></script>
+    <script src="springy.js"></script>
+    <script src="springyui.js"></script>
+
+    <script>
+      jQuery(function(){
+        // block that's executed by jQuery when the page is fully loaded
+
+        var textarea = jQuery('#graphtext');
+        var graph;
+        var canvas = jQuery('.canvas');
+
+        function refresh() {
+          graph = new Graph();
+          graph.loadJSON( textarea.val() );
+
+          canvas.springy({ graph: graph });
+        }
+        
+        refresh();
+      });
+    </script>
+  </head>
+
+  <body>
+
+<div class="content">
+  <canvas class="canvas" width="640" height="480"></canvas>
+  
+  <div class="graphtext">
+    <textarea id="graphtext" rows="30">
+{
+  "nodes": [
+    "Amphitryon",
+    "Alcmene",
+    "Iphicles",
+    "Heracles"
+  ],
+  "edges": [
+    ["Amphitryon", "Alcmene"],
+    ["Alcmene", "Amphitryon"],
+    ["Amphitryon", "Iphicles"],
+    ["Amphitryon", "Heracles"]
+  ]
+}
+    </textarea>
+  </div>
+</div>
+
+  </body>
+</html>

graphs/jquery-1.3.2.min.js

+/*
+ * jQuery JavaScript Library v1.3.2
+ * http://jquery.com/
+ *
+ * Copyright (c) 2009 John Resig
+ * Dual licensed under the MIT and GPL licenses.
+ * http://docs.jquery.com/License
+ *
+ * Date: 2009-02-19 17:34:21 -0500 (Thu, 19 Feb 2009)
+ * Revision: 6246
+ */
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E+F*G},swing:function(G,H,E,F){return((-Math.cos(G*Math.PI)/2)+0.5)*F+E}},timers:[],fx:function(F,E,G){this.options=E;this.elem=F;this.prop=G;if(!E.orig){E.orig={}}}});o.fx.prototype={update:function(){if(this.options.step){this.options.step.call(this.elem,this.now,this)}(o.fx.step[this.prop]||o.fx.step._default)(this);if((this.prop=="height"||this.prop=="width")&&this.elem.style){this.elem.style.display="block"}},cur:function(F){if(this.elem[this.prop]!=null&&(!this.elem.style||this.elem.style[this.prop]==null)){return this.elem[this.prop]}var E=parseFloat(o.css(this.elem,this.prop,F));return E&&E>-10000?E:parseFloat(o.curCSS(this.elem,this.prop))||0},custom:function(I,H,G){this.startTime=e();this.start=I;this.end=H;this.unit=G||this.unit||"px";this.now=this.start;this.pos=this.state=0;var E=this;function F(J){return E.step(J)}F.elem=this.elem;if(F()&&o.timers.push(F)&&!n){n=setInterval(function(){var K=o.timers;for(var 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graphs/springy.js

+/**
+ * Springy v1.2.0
+ *
+ * Copyright (c) 2010 Dennis Hotson
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+// Enable strict mode for EC5 compatible browsers
+"use strict";
+
+var Graph = function() {
+	this.nodeSet = {};
+	this.nodes = [];
+	this.edges = [];
+	this.adjacency = {};
+
+	this.nextNodeId = 0;
+	this.nextEdgeId = 0;
+	this.eventListeners = [];
+};
+
+var Node = function(id, data) {
+	this.id = id;
+	this.data = (data !== undefined) ? data : {};
+
+// Data fields used by layout algorithm in this file:
+//   	this.data.mass
+// Data used by default renderer in springyui.js
+//   	this.data.label
+};
+
+var Edge = function(id, source, target, data) {
+	this.id = id;
+        /** @type {Node} */
+	this.source = source;
+	this.target = target;
+	this.data = (data !== undefined) ? data : {};
+
+// Edge data field used by layout alorithm
+//   	this.data.length
+//   	this.data.type
+};
+
+Graph.prototype.addNode = function(node) {
+	if (!(node.id in this.nodeSet)) {
+		this.nodes.push(node);
+	}
+
+	this.nodeSet[node.id] = node;
+
+	this.notify();
+	return node;
+};
+
+Graph.prototype.addNodes = function() {
+        // accepts variable number of arguments, where each argument
+        // is a string that becomes both node identifier and label
+        for (var i = 0; i < arguments.length; i++) {
+                var name = arguments[i];
+                var node = new Node(name, {label:name});
+                this.addNode(node);
+        }
+};
+
+Graph.prototype.addEdge = function(edge) {
+	var exists = false;
+	this.edges.forEach(function(e) {
+		if (edge.id === e.id) { exists = true; }
+	});
+
+	if (!exists) {
+		this.edges.push(edge);
+	}
+
+	if (!(edge.source.id in this.adjacency)) {
+		this.adjacency[edge.source.id] = {};
+	}
+	if (!(edge.target.id in this.adjacency[edge.source.id])) {
+		this.adjacency[edge.source.id][edge.target.id] = [];
+	}
+
+	exists = false;
+	this.adjacency[edge.source.id][edge.target.id].forEach(function(e) {
+			if (edge.id === e.id) { exists = true; }
+	});
+
+	if (!exists) {
+		this.adjacency[edge.source.id][edge.target.id].push(edge);
+	}
+
+	this.notify();
+	return edge;
+};
+
+Graph.prototype.addEdges = function() {
+        // accepts variable number of arguments, where each argument
+        // is a triple [nodeid1, nodeid2, attributes]
+        for (var i = 0; i < arguments.length; i++) {
+                var e = arguments[i];
+                var node1 = this.nodeSet[e[0]];
+                if (node1 == undefined) {
+                        throw new TypeError("invalid node name: " + e[0]);
+                }
+                var node2 = this.nodeSet[e[1]];
+                if (node2 == undefined) {
+                        throw new TypeError("invalid node name: " + e[1]);
+                }
+                var attr = e[2];
+
+                this.newEdge(node1, node2, attr);
+        }
+};
+
+Graph.prototype.newNode = function(data) {
+	var node = new Node(this.nextNodeId++, data);
+	this.addNode(node);
+	return node;
+};
+
+Graph.prototype.newEdge = function(source, target, data) {
+	var edge = new Edge(this.nextEdgeId++, source, target, data);
+	this.addEdge(edge);
+	return edge;
+};
+
+
+// add nodes and edges from JSON object
+Graph.prototype.loadJSON = function(json) {
+/**
+Springy's simple JSON format for graphs.
+
+historically, Springy uses separate lists
+of nodes and edges:
+
+    {
+      "nodes": [
+        "center",
+        "left",
+        "right",
+        "up",
+        "satellite"
+      ],
+      "edges": [
+        ["center", "left"],
+        ["center", "right"],
+        ["center", "up"]
+      ]
+    }
+
+**/
+	// parse if a string is passed (EC5+ browsers)
+	if (typeof json == 'string' || json instanceof String) {
+		json = JSON.parse( json );
+	}
+
+	if ('nodes' in json || 'edges' in json) {
+		this.addNodes.apply(this, json['nodes']);
+		this.addEdges.apply(this, json['edges']);
+	}
+}
+
+
+// find the edges from node1 to node2
+Graph.prototype.getEdges = function(node1, node2) {
+	if (node1.id in this.adjacency
+		&& node2.id in this.adjacency[node1.id]) {
+		return this.adjacency[node1.id][node2.id];
+	}
+
+	return [];
+};
+
+// remove a node and it's associated edges from the graph
+Graph.prototype.removeNode = function(node) {
+	if (node.id in this.nodeSet) {
+		delete this.nodeSet[node.id];
+	}
+
+	for (var i = this.nodes.length - 1; i >= 0; i--) {
+		if (this.nodes[i].id === node.id) {
+			this.nodes.splice(i, 1);
+		}
+	}
+
+	this.detachNode(node);
+
+};
+
+// removes edges associated with a given node
+Graph.prototype.detachNode = function(node) {
+	var tmpEdges = this.edges.slice();
+	tmpEdges.forEach(function(e) {
+		if (e.source.id === node.id || e.target.id === node.id) {
+			this.removeEdge(e);
+		}
+	}, this);
+
+	this.notify();
+};
+
+// remove a node and it's associated edges from the graph
+Graph.prototype.removeEdge = function(edge) {
+	for (var i = this.edges.length - 1; i >= 0; i--) {
+		if (this.edges[i].id === edge.id) {
+			this.edges.splice(i, 1);
+		}
+	}
+
+	for (var x in this.adjacency) {
+		for (var y in this.adjacency[x]) {
+			var edges = this.adjacency[x][y];
+
+			for (var j=edges.length - 1; j>=0; j--) {
+				if (this.adjacency[x][y][j].id === edge.id) {
+					this.adjacency[x][y].splice(j, 1);
+				}
+			}
+		}
+	}
+
+	this.notify();
+};
+
+/* Merge a list of nodes and edges into the current graph. eg.
+var o = {
+	nodes: [
+		{id: 123, data: {type: 'user', userid: 123, displayname: 'aaa'}},
+		{id: 234, data: {type: 'user', userid: 234, displayname: 'bbb'}}
+	],
+	edges: [
+		{from: 0, to: 1, type: 'submitted_design', directed: true, data: {weight: }}
+	]
+}
+*/
+Graph.prototype.merge = function(data) {
+	var nodes = [];
+	data.nodes.forEach(function(n) {
+		nodes.push(this.addNode(new Node(n.id, n.data)));
+	}, this);
+
+	data.edges.forEach(function(e) {
+		var from = nodes[e.from];
+		var to = nodes[e.to];
+
+		var id = (e.directed)
+			? (id = e.type + "-" + from.id + "-" + to.id)
+			: (from.id < to.id) // normalise id for non-directed edges
+				? e.type + "-" + from.id + "-" + to.id
+				: e.type + "-" + to.id + "-" + from.id;
+
+		var edge = this.addEdge(new Edge(id, from, to, e.data));
+		edge.data.type = e.type;
+	}, this);
+};
+
+Graph.prototype.filterNodes = function(fn) {
+	var tmpNodes = this.nodes.slice();
+	tmpNodes.forEach(function(n) {
+		if (!fn(n)) {
+			this.removeNode(n);
+		}
+	}, this);
+};
+
+Graph.prototype.filterEdges = function(fn) {
+	var tmpEdges = this.edges.slice();
+	tmpEdges.forEach(function(e) {
+		if (!fn(e)) {
+			this.removeEdge(e);
+		}
+	}, this);
+};
+
+
+Graph.prototype.addGraphListener = function(obj) {
+	this.eventListeners.push(obj);
+};
+
+Graph.prototype.notify = function() {
+	this.eventListeners.forEach(function(obj){
+		obj.graphChanged();
+	});
+};
+
+// -----------
+var Layout = {};
+Layout.ForceDirected = function(graph, stiffness, repulsion, damping) {
+	this.graph = graph;
+	this.stiffness = stiffness; // spring stiffness constant
+	this.repulsion = repulsion; // repulsion constant
+	this.damping = damping; // velocity damping factor
+
+	this.nodePoints = {}; // keep track of points associated with nodes
+	this.edgeSprings = {}; // keep track of springs associated with edges
+};
+
+Layout.ForceDirected.prototype.point = function(node) {
+	if (!(node.id in this.nodePoints)) {
+		var mass = (node.data.mass !== undefined) ? node.data.mass : 1.0;
+		this.nodePoints[node.id] = new Layout.ForceDirected.Point(Vector.random(), mass);
+	}
+
+	return this.nodePoints[node.id];
+};
+
+Layout.ForceDirected.prototype.spring = function(edge) {
+	if (!(edge.id in this.edgeSprings)) {
+		var length = (edge.data.length !== undefined) ? edge.data.length : 1.0;
+
+		var existingSpring = false;
+
+		var from = this.graph.getEdges(edge.source, edge.target);
+		from.forEach(function(e) {
+			if (existingSpring === false && e.id in this.edgeSprings) {
+				existingSpring = this.edgeSprings[e.id];
+			}
+		}, this);
+
+		if (existingSpring !== false) {
+			return new Layout.ForceDirected.Spring(existingSpring.point1, existingSpring.point2, 0.0, 0.0);
+		}
+
+		var to = this.graph.getEdges(edge.target, edge.source);
+		from.forEach(function(e){
+			if (existingSpring === false && e.id in this.edgeSprings) {
+				existingSpring = this.edgeSprings[e.id];
+			}
+		}, this);
+
+		if (existingSpring !== false) {
+			return new Layout.ForceDirected.Spring(existingSpring.point2, existingSpring.point1, 0.0, 0.0);
+		}
+
+		this.edgeSprings[edge.id] = new Layout.ForceDirected.Spring(
+			this.point(edge.source), this.point(edge.target), length, this.stiffness
+		);
+	}
+
+	return this.edgeSprings[edge.id];
+};
+
+// callback should accept two arguments: Node, Point
+Layout.ForceDirected.prototype.eachNode = function(callback) {
+	var t = this;
+	this.graph.nodes.forEach(function(n){
+		callback.call(t, n, t.point(n));
+	});
+};
+
+// callback should accept two arguments: Edge, Spring
+Layout.ForceDirected.prototype.eachEdge = function(callback) {
+	var t = this;
+	this.graph.edges.forEach(function(e){
+		callback.call(t, e, t.spring(e));
+	});
+};
+
+// callback should accept one argument: Spring
+Layout.ForceDirected.prototype.eachSpring = function(callback) {
+	var t = this;
+	this.graph.edges.forEach(function(e){
+		callback.call(t, t.spring(e));
+	});
+};
+
+
+// Physics stuff
+Layout.ForceDirected.prototype.applyCoulombsLaw = function() {
+	this.eachNode(function(n1, point1) {
+		this.eachNode(function(n2, point2) {
+			if (point1 !== point2)
+			{
+				var d = point1.p.subtract(point2.p);
+				var distance = d.magnitude() + 0.1; // avoid massive forces at small distances (and divide by zero)
+				var direction = d.normalise();
+
+				// apply force to each end point
+				point1.applyForce(direction.multiply(this.repulsion).divide(distance * distance * 0.5));
+				point2.applyForce(direction.multiply(this.repulsion).divide(distance * distance * -0.5));
+			}
+		});
+	});
+};
+
+Layout.ForceDirected.prototype.applyHookesLaw = function() {
+	this.eachSpring(function(spring){
+		var d = spring.point2.p.subtract(spring.point1.p); // the direction of the spring
+		var displacement = spring.length - d.magnitude();
+		var direction = d.normalise();
+
+		// apply force to each end point
+		spring.point1.applyForce(direction.multiply(spring.k * displacement * -0.5));
+		spring.point2.applyForce(direction.multiply(spring.k * displacement * 0.5));
+	});
+};
+
+Layout.ForceDirected.prototype.attractToCentre = function() {
+	this.eachNode(function(node, point) {
+		var direction = point.p.multiply(-1.0);
+		point.applyForce(direction.multiply(this.repulsion / 50.0));
+	});
+};
+
+
+Layout.ForceDirected.prototype.updateVelocity = function(timestep) {
+	this.eachNode(function(node, point) {
+		// Is this, along with updatePosition below, the only places that your
+		// integration code exist?
+		point.v = point.v.add(point.a.multiply(timestep)).multiply(this.damping);
+		point.a = new Vector(0,0);
+	});
+};
+
+Layout.ForceDirected.prototype.updatePosition = function(timestep) {
+	this.eachNode(function(node, point) {
+		// Same question as above; along with updateVelocity, is this all of
+		// your integration code?
+		point.p = point.p.add(point.v.multiply(timestep));
+	});
+};
+
+// Calculate the total kinetic energy of the system
+Layout.ForceDirected.prototype.totalEnergy = function(timestep) {
+	var energy = 0.0;
+	this.eachNode(function(node, point) {
+		var speed = point.v.magnitude();
+		energy += 0.5 * point.m * speed * speed;
+	});
+
+	return energy;
+};
+
+var __bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; }; // stolen from coffeescript, thanks jashkenas! ;-)
+
+Layout.requestAnimationFrame = __bind(window.requestAnimationFrame ||
+	window.webkitRequestAnimationFrame ||
+	window.mozRequestAnimationFrame ||
+	window.oRequestAnimationFrame ||
+	window.msRequestAnimationFrame ||
+	function(callback, element) {
+		window.setTimeout(callback, 10);
+	}, window);
+
+
+// start simulation
+Layout.ForceDirected.prototype.start = function(render, done) {
+	var t = this;
+
+	if (this._started) return;
+	this._started = true;
+
+	Layout.requestAnimationFrame(function step() {
+		t.applyCoulombsLaw();
+		t.applyHookesLaw();
+		t.attractToCentre();
+		t.updateVelocity(0.03);
+		t.updatePosition(0.03);
+
+		if (render !== undefined) {
+			render();
+                }
+
+		// stop simulation when energy of the system goes below a threshold
+		if (t.totalEnergy() < 0.01) {
+			t._started = false;
+			if (done !== undefined) { done(); }
+		} else {
+			Layout.requestAnimationFrame(step);
+		}
+	});
+};
+
+// Find the nearest point to a particular position
+Layout.ForceDirected.prototype.nearest = function(pos) {
+	var min = {node: null, point: null, distance: null};
+	var t = this;
+	this.graph.nodes.forEach(function(n){
+		var point = t.point(n);
+		var distance = point.p.subtract(pos).magnitude();
+
+		if (min.distance === null || distance < min.distance) {
+			min = {node: n, point: point, distance: distance};
+		}
+	});
+
+	return min;
+};
+
+// returns [bottomleft, topright]
+Layout.ForceDirected.prototype.getBoundingBox = function() {
+	var bottomleft = new Vector(-2,-2);
+	var topright = new Vector(2,2);
+
+	this.eachNode(function(n, point) {
+		if (point.p.x < bottomleft.x) {
+			bottomleft.x = point.p.x;
+		}
+		if (point.p.y < bottomleft.y) {
+			bottomleft.y = point.p.y;
+		}
+		if (point.p.x > topright.x) {
+			topright.x = point.p.x;
+		}
+		if (point.p.y > topright.y) {
+			topright.y = point.p.y;
+		}
+	});
+
+	var padding = topright.subtract(bottomleft).multiply(0.07); // ~5% padding
+
+	return {bottomleft: bottomleft.subtract(padding), topright: topright.add(padding)};
+};
+
+
+// Vector
+var Vector = function(x, y) {
+	this.x = x;
+	this.y = y;
+};
+
+Vector.random = function() {
+	return new Vector(10.0 * (Math.random() - 0.5), 10.0 * (Math.random() - 0.5));
+};
+
+Vector.prototype.add = function(v2) {
+	return new Vector(this.x + v2.x, this.y + v2.y);
+};
+
+Vector.prototype.subtract = function(v2) {
+	return new Vector(this.x - v2.x, this.y - v2.y);
+};
+
+Vector.prototype.multiply = function(n) {
+	return new Vector(this.x * n, this.y * n);
+};
+
+Vector.prototype.divide = function(n) {
+	return new Vector((this.x / n) || 0, (this.y / n) || 0); // Avoid divide by zero errors..
+};
+
+Vector.prototype.magnitude = function() {
+	return Math.sqrt(this.x*this.x + this.y*this.y);
+};
+
+Vector.prototype.normal = function() {
+	return new Vector(-this.y, this.x);
+};
+
+Vector.prototype.normalise = function() {
+	return this.divide(this.magnitude());
+};
+
+// Point
+Layout.ForceDirected.Point = function(position, mass) {
+	this.p = position; // position
+	this.m = mass; // mass
+	this.v = new Vector(0, 0); // velocity
+	this.a = new Vector(0, 0); // acceleration
+};
+
+Layout.ForceDirected.Point.prototype.applyForce = function(force) {
+	this.a = this.a.add(force.divide(this.m));
+};
+
+// Spring
+Layout.ForceDirected.Spring = function(point1, point2, length, k) {
+	this.point1 = point1;
+	this.point2 = point2;
+	this.length = length; // spring length at rest
+	this.k = k; // spring constant (See Hooke's law) .. how stiff the spring is
+};
+
+// Layout.ForceDirected.Spring.prototype.distanceToPoint = function(point)
+// {
+// 	// hardcore vector arithmetic.. ohh yeah!
+// 	// .. see http://stackoverflow.com/questions/849211/shortest-distance-between-a-point-and-a-line-segment/865080#865080
+// 	var n = this.point2.p.subtract(this.point1.p).normalise().normal();
+// 	var ac = point.p.subtract(this.point1.p);
+// 	return Math.abs(ac.x * n.x + ac.y * n.y);
+// };
+
+// Renderer handles the layout rendering loop
+function Renderer(layout, clear, drawEdge, drawNode) {
+	this.layout = layout;
+	this.clear = clear;
+	this.drawEdge = drawEdge;
+	this.drawNode = drawNode;
+
+	this.layout.graph.addGraphListener(this);
+}
+
+Renderer.prototype.graphChanged = function(e) {
+	this.start();
+};
+
+Renderer.prototype.start = function() {
+	var t = this;
+	this.layout.start(function render() {
+		t.clear();
+
+		t.layout.eachEdge(function(edge, spring) {
+			t.drawEdge(edge, spring.point1.p, spring.point2.p);
+		});
+
+		t.layout.eachNode(function(node, point) {
+			t.drawNode(node, point.p);
+		});
+	});
+};
+
+// Array.forEach implementation for IE support..
+//https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/forEach
+if ( !Array.prototype.forEach ) {
+  Array.prototype.forEach = function( callback, thisArg ) {
+    var T, k;
+    if ( this == null ) {
+      throw new TypeError( " this is null or not defined" );
+    }
+    var O = Object(this);
+    var len = O.length >>> 0; // Hack to convert O.length to a UInt32
+    if ( {}.toString.call(callback) != "[object Function]" ) {
+      throw new TypeError( callback + " is not a function" );
+    }
+    if ( thisArg ) {
+      T = thisArg;
+    }
+    k = 0;
+    while( k < len ) {
+      var kValue;
+      if ( k in O ) {
+        kValue = O[ k ];
+        callback.call( T, kValue, k, O );
+      }
+      k++;
+    }
+  };
+}
+

graphs/springyui.js

+/**
+Copyright (c) 2010 Dennis Hotson
+
+ Permission is hereby granted, free of charge, to any person
+ obtaining a copy of this software and associated documentation
+ files (the "Software"), to deal in the Software without
+ restriction, including without limitation the rights to use,
+ copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the
+ Software is furnished to do so, subject to the following
+ conditions:
+
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+(function() {
+
+jQuery.fn.springy = function(params) {
+	var graph = this.graph = params.graph || new Graph();
+
+	var stiffness = params.stiffness || 400.0;
+	var repulsion = params.repulsion || 400.0;
+	var damping = params.damping || 0.5;
+	var nodeSelected = params.nodeSelected || null;
+
+	var canvas = this[0];
+	var ctx = canvas.getContext("2d");
+
+	var layout = this.layout = new Layout.ForceDirected(graph, stiffness, repulsion, damping);
+
+	// calculate bounding box of graph layout.. with ease-in
+	var currentBB = layout.getBoundingBox();
+	var targetBB = {bottomleft: new Vector(-2, -2), topright: new Vector(2, 2)};
+
+	// auto adjusting bounding box
+	Layout.requestAnimationFrame(function adjust() {
+		targetBB = layout.getBoundingBox();
+		// current gets 20% closer to target every iteration
+		currentBB = {
+			bottomleft: currentBB.bottomleft.add( targetBB.bottomleft.subtract(currentBB.bottomleft)
+				.divide(10)),
+			topright: currentBB.topright.add( targetBB.topright.subtract(currentBB.topright)
+				.divide(10))
+		};
+
+		Layout.requestAnimationFrame(adjust);
+	});
+
+	// convert to/from screen coordinates
+	toScreen = function(p) {
+		var size = currentBB.topright.subtract(currentBB.bottomleft);
+		var sx = p.subtract(currentBB.bottomleft).divide(size.x).x * canvas.width;
+		var sy = p.subtract(currentBB.bottomleft).divide(size.y).y * canvas.height;
+		return new Vector(sx, sy);
+	};
+
+	fromScreen = function(s) {
+		var size = currentBB.topright.subtract(currentBB.bottomleft);
+		var px = (s.x / canvas.width) * size.x + currentBB.bottomleft.x;
+		var py = (s.y / canvas.height) * size.y + currentBB.bottomleft.y;
+		return new Vector(px, py);
+	};
+
+	// half-assed drag and drop
+	var selected = null;
+	var nearest = null;
+	var dragged = null;
+
+	jQuery(canvas).mousedown(function(e) {
+		jQuery('.actions').hide();
+
+		var pos = jQuery(this).offset();
+		var p = fromScreen({x: e.pageX - pos.left, y: e.pageY - pos.top});
+		selected = nearest = dragged = layout.nearest(p);
+
+		if (selected.node !== null) {
+			dragged.point.m = 10000.0;
+
+			if (nodeSelected) {
+				nodeSelected(selected.node);
+			}
+		}
+
+		renderer.start();
+	});
+
+	jQuery(canvas).mousemove(function(e) {
+		var pos = jQuery(this).offset();
+		var p = fromScreen({x: e.pageX - pos.left, y: e.pageY - pos.top});
+		nearest = layout.nearest(p);
+
+		if (dragged !== null && dragged.node !== null) {
+			dragged.point.p.x = p.x;
+			dragged.point.p.y = p.y;
+		}
+
+		renderer.start();
+	});
+
+	jQuery(window).bind('mouseup',function(e) {
+		dragged = null;
+	});
+
+	Node.prototype.getWidth = function() {
+		var text = (this.data.label !== undefined) ? this.data.label : this.id;
+		if (this._width && this._width[text])
+			return this._width[text];
+
+		ctx.save();
+		ctx.font = "16px Verdana, sans-serif";
+		var width = ctx.measureText(text).width + 10;
+		ctx.restore();
+
+		this._width || (this._width = {});
+		this._width[text] = width;
+
+		return width;
+	};
+
+	Node.prototype.getHeight = function() {
+		return 20;
+	};
+
+	var renderer = new Renderer(layout,
+		function clear() {
+			ctx.clearRect(0,0,canvas.width,canvas.height);
+		},
+		function drawEdge(edge, p1, p2) {
+			var x1 = toScreen(p1).x;
+			var y1 = toScreen(p1).y;
+			var x2 = toScreen(p2).x;
+			var y2 = toScreen(p2).y;
+
+			var direction = new Vector(x2-x1, y2-y1);
+			var normal = direction.normal().normalise();
+
+			var from = graph.getEdges(edge.source, edge.target);
+			var to = graph.getEdges(edge.target, edge.source);
+
+			var total = from.length + to.length;
+
+			// Figure out edge's position in relation to other edges between the same nodes
+			var n = 0;
+			for (var i=0; i<from.length; i++) {
+				if (from[i].id === edge.id) {
+					n = i;
+				}
+			}
+
+			var spacing = 6.0;
+
+			// Figure out how far off center the line should be drawn
+			var offset = normal.multiply(-((total - 1) * spacing)/2.0 + (n * spacing));
+
+			var s1 = toScreen(p1).add(offset);
+			var s2 = toScreen(p2).add(offset);
+
+			var boxWidth = edge.target.getWidth();
+			var boxHeight = edge.target.getHeight();
+
+			var intersection = intersect_line_box(s1, s2, {x: x2-boxWidth/2.0, y: y2-boxHeight/2.0}, boxWidth, boxHeight);
+
+			if (!intersection) {
+				intersection = s2;
+			}
+
+			var stroke = (edge.data.color !== undefined) ? edge.data.color : '#000000';
+
+			var arrowWidth;
+			var arrowLength;
+
+			var weight = (edge.data.weight !== undefined) ? edge.data.weight : 1.0;
+
+			ctx.lineWidth = Math.max(weight *  2, 0.1);
+			arrowWidth = 1 + ctx.lineWidth;
+			arrowLength = 8;
+
+			var directional = (edge.data.directional !== undefined) ? edge.data.directional : true;
+
+			// line
+			var lineEnd;
+			if (directional) {
+				lineEnd = intersection.subtract(direction.normalise().multiply(arrowLength * 0.5));
+			} else {
+				lineEnd = s2;
+			}
+
+			ctx.strokeStyle = stroke;
+			ctx.beginPath();
+			ctx.moveTo(s1.x, s1.y);
+			ctx.lineTo(lineEnd.x, lineEnd.y);
+			ctx.stroke();
+
+			// arrow
+			if (directional) {
+				ctx.save();
+				ctx.fillStyle = stroke;
+				ctx.translate(intersection.x, intersection.y);
+				ctx.rotate(Math.atan2(y2 - y1, x2 - x1));
+				ctx.beginPath();
+				ctx.moveTo(-arrowLength, arrowWidth);
+				ctx.lineTo(0, 0);
+				ctx.lineTo(-arrowLength, -arrowWidth);
+				ctx.lineTo(-arrowLength * 0.8, -0);
+				ctx.closePath();
+				ctx.fill();
+				ctx.restore();
+			}
+
+			// label
+			if (edge.data.label !== undefined) {
+				text = edge.data.label
+				ctx.save();
+				ctx.textAlign = "center";
+				ctx.textBaseline = "top";
+				ctx.font = "10px Helvetica, sans-serif";
+				ctx.fillStyle = "#5BA6EC";
+				ctx.fillText(text, (x1+x2)/2, (y1+y2)/2);
+				ctx.restore();
+			}
+
+		},
+		function drawNode(node, p) {
+			var s = toScreen(p);
+
+			ctx.save();
+
+			var boxWidth = node.getWidth();
+			var boxHeight = node.getHeight();
+
+			// clear background
+			ctx.clearRect(s.x - boxWidth/2, s.y - 10, boxWidth, 20);
+
+			// fill background
+			if (selected !== null && nearest.node !== null && selected.node.id === node.id) {
+				ctx.fillStyle = "#FFFFE0";
+			} else if (nearest !== null && nearest.node !== null && nearest.node.id === node.id) {
+				ctx.fillStyle = "#EEEEEE";
+			} else {
+				ctx.fillStyle = "#FFFFFF";
+			}
+			ctx.fillRect(s.x - boxWidth/2, s.y - 10, boxWidth, 20);
+
+			ctx.textAlign = "left";
+			ctx.textBaseline = "top";
+			ctx.font = "16px Verdana, sans-serif";
+			ctx.fillStyle = "#000000";
+			ctx.font = "16px Verdana, sans-serif";
+			var text = (node.data.label !== undefined) ? node.data.label : node.id;
+			ctx.fillText(text, s.x - boxWidth/2 + 5, s.y - 8);
+
+			ctx.restore();
+		}
+	);
+
+	renderer.start();
+
+	// helpers for figuring out where to draw arrows
+	function intersect_line_line(p1, p2, p3, p4) {
+		var denom = ((p4.y - p3.y)*(p2.x - p1.x) - (p4.x - p3.x)*(p2.y - p1.y));
+
+		// lines are parallel
+		if (denom === 0) {
+			return false;
+		}
+
+		var ua = ((p4.x - p3.x)*(p1.y - p3.y) - (p4.y - p3.y)*(p1.x - p3.x)) / denom;
+		var ub = ((p2.x - p1.x)*(p1.y - p3.y) - (p2.y - p1.y)*(p1.x - p3.x)) / denom;
+
+		if (ua < 0 || ua > 1 || ub < 0 || ub > 1) {
+			return false;
+		}
+
+		return new Vector(p1.x + ua * (p2.x - p1.x), p1.y + ua * (p2.y - p1.y));
+	}
+
+	function intersect_line_box(p1, p2, p3, w, h) {
+		var tl = {x: p3.x, y: p3.y};
+		var tr = {x: p3.x + w, y: p3.y};
+		var bl = {x: p3.x, y: p3.y + h};
+		var br = {x: p3.x + w, y: p3.y + h};
+
+		var result;
+		if (result = intersect_line_line(p1, p2, tl, tr)) { return result; } // top
+		if (result = intersect_line_line(p1, p2, tr, br)) { return result; } // right
+		if (result = intersect_line_line(p1, p2, br, bl)) { return result; } // bottom
+		if (result = intersect_line_line(p1, p2, bl, tl)) { return result; } // left
+
+		return false;
+	}
+
+	return this;
+}
+
+})();
 
 <body>
   <div>
+   <a href="graphs/index.html"><span class="title">Graph playground</span></a>
+   <div class="description">Visualizing graphs in JavaScript.</div>
+   <div class="technology">JavaScript + CSS + Springy</div>
+  </div>
+  <div>
    <a href="dotparser/index.html"><span class="title">DOT parser</span></a>
    <div class="description">Graphviz's DOT language parser.</div>
    <div class="technology">JavaScript + Jison + HTML5</div>