236 lines
9.1 KiB
HTML
236 lines
9.1 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>Force Directed Layout</title>
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<meta name="description" content="Interactive demonstration of physics layout features by the ForceDirectedLayout class." />
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<!-- Copyright 1998-2017 by Northwoods Software Corporation. -->
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<meta charset="UTF-8">
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<script src="../release/go.js"></script>
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<script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
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<script id="code">
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// define a custom ForceDirectedLayout for this sample
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function DemoForceDirectedLayout() {
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go.ForceDirectedLayout.call(this);
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}
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go.Diagram.inherit(DemoForceDirectedLayout, go.ForceDirectedLayout);
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// Override the makeNetwork method to also initialize
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// ForceDirectedVertex.isFixed from the corresponding Node.isSelected.
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/** @override */
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DemoForceDirectedLayout.prototype.makeNetwork = function(coll) {
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// call base method for standard behavior
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var net = go.ForceDirectedLayout.prototype.makeNetwork.call(this, coll);
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net.vertexes.each(function(vertex) {
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var node = vertex.node;
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if (node !== null) vertex.isFixed = node.isSelected;
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});
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return net;
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};
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// end DemoForceDirectedLayout class
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function init() {
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if (window.goSamples) goSamples(); // init for these samples -- you don't need to call this
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var $ = go.GraphObject.make; // for conciseness in defining templates
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myDiagram =
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$(go.Diagram, "myDiagramDiv", // must be the ID or reference to div
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{
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initialContentAlignment: go.Spot.Center, // start everything in the middle of the viewport
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initialAutoScale: go.Diagram.Uniform, // zoom to make everything fit in the viewport
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layout: new DemoForceDirectedLayout() // use custom layout
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// other Layout properties are set by the layout function, defined below
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});
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// define the Node template
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myDiagram.nodeTemplate =
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$(go.Node, "Spot",
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// make sure the Node.location is different from the Node.position
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{ locationSpot: go.Spot.Center },
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new go.Binding("text", "text"), // for sorting
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$(go.Shape, "Ellipse",
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{ fill: "lightgray",
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stroke: null,
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desiredSize: new go.Size(30, 30) },
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new go.Binding("fill", "fill")),
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$(go.TextBlock,
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new go.Binding("text", "text"))
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);
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// define the Link template
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myDiagram.linkTemplate =
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$(go.Link,
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{ selectable: false },
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$(go.Shape,
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{ strokeWidth: 3, stroke: "#333" }));
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// generate a tree using the default values
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rebuildGraph();
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}
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function rebuildGraph() {
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var minNodes = document.getElementById("minNodes").value;
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minNodes = parseInt(minNodes, 10);
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var maxNodes = document.getElementById("maxNodes").value;
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maxNodes = parseInt(maxNodes, 10);
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var minChil = document.getElementById("minChil").value;
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minChil = parseInt(minChil, 10);
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var maxChil = document.getElementById("maxChil").value;
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maxChil = parseInt(maxChil, 10);
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generateTree(minNodes, maxNodes, minChil, maxChil);
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}
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function generateTree(minNodes, maxNodes, minChil, maxChil) {
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myDiagram.startTransaction("generateTree");
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// replace the diagram's model's nodeDataArray
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generateNodes(minNodes, maxNodes);
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// replace the diagram's model's linkDataArray
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generateLinks(minChil, maxChil);
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// perform a diagram layout with the latest parameters
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layout();
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myDiagram.commitTransaction("generateTree");
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}
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// Creates a random number of randomly colored nodes.
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function generateNodes(min, max) {
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var nodeArray = [];
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if (isNaN(min) || min < 0) min = 0;
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if (isNaN(max) || max < min) max = min;
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var numNodes = Math.floor(Math.random() * (max - min + 1)) + min;
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for (var i = 0; i < numNodes; i++) {
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nodeArray.push({
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key: i,
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text: i.toString(),
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fill: go.Brush.randomColor()
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});
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}
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// randomize the node data
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for (i = 0; i < nodeArray.length; i++) {
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var swap = Math.floor(Math.random() * nodeArray.length);
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var temp = nodeArray[swap];
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nodeArray[swap] = nodeArray[i];
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nodeArray[i] = temp;
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}
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// set the nodeDataArray to this array of objects
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myDiagram.model.nodeDataArray = nodeArray;
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}
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// Takes the random collection of nodes and creates a random tree with them.
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// Respects the minimum and maximum number of links from each node.
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// (The minimum can be disregarded if we run out of nodes to link to)
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function generateLinks(min, max) {
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if (myDiagram.nodes.count < 2) return;
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if (isNaN(min) || min < 1) min = 1;
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if (isNaN(max) || max < min) max = min;
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var linkArray = [];
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// make two Lists of nodes to keep track of where links already exist
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var nit = myDiagram.nodes;
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var nodes = new go.List(go.Node);
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nodes.addAll(nit);
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var available = new go.List(go.Node);
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available.addAll(nodes);
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for (var i = 0; i < nodes.length; i++) {
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var next = nodes.elt(i);
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available.remove(next)
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var children = Math.floor(Math.random() * (max - min + 1)) + min;
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for (var j = 1; j <= children; j++) {
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if (available.length === 0) break;
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var to = available.elt(0);
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available.remove(to);
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// get keys from the Node.text strings
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var nextKey = parseInt(next.text, 10);
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var toKey = parseInt(to.text, 10);
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linkArray.push({ from: nextKey, to: toKey });
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}
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}
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myDiagram.model.linkDataArray = linkArray;
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}
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// Update the layout from the controls.
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// Changing the properties will invalidate the layout.
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function layout() {
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myDiagram.startTransaction("changed Layout");
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var lay = myDiagram.layout;
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var maxIter = document.getElementById("maxIter").value;
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maxIter = parseInt(maxIter, 10);
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lay.maxIterations = maxIter;
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var epsilon = document.getElementById("epsilon").value;
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epsilon = parseFloat(epsilon, 10);
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lay.epsilon = epsilon;
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var infinity = document.getElementById("infinity").value;
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infinity = parseFloat(infinity, 10);
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lay.infinity = infinity;
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var arrangement = document.getElementById("arrangement").value;
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var arrangementSpacing = new go.Size();
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arrangement = arrangement.split(" ", 2);
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arrangementSpacing.width = parseFloat(arrangement[0], 10);
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arrangementSpacing.height = parseFloat(arrangement[1], 10);
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lay.arrangementSpacing = arrangementSpacing;
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var charge = document.getElementById("charge").value;
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charge = parseFloat(charge, 10);
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lay.defaultElectricalCharge = charge;
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var mass = document.getElementById("mass").value;
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mass = parseFloat(mass, 10);
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lay.defaultGravitationalMass = mass;
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var stiffness = document.getElementById("stiffness").value;
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stiffness = parseFloat(stiffness, 10);
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lay.defaultSpringStiffness = stiffness;
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var length = document.getElementById("length").value;
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length = parseFloat(length, 10);
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lay.defaultSpringLength = length;
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myDiagram.commitTransaction("changed Layout");
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}
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</script>
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</head>
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<body onload="init()">
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<div id="sample">
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<div style="margin-bottom: 5px; padding: 5px; background-color: aliceblue">
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<span style="display: inline-block; vertical-align: top; padding: 5px">
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<b>New Tree</b><br />
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MinNodes: <input type="text" size="3" id="minNodes" value="20" /><br />
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MaxNodes: <input type="text" size="3" id="maxNodes" value="100" /><br />
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MinChildren: <input type="text" size="3" id="minChil" value="1" /><br />
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MaxChildren: <input type="text" size="3" id="maxChil" value="10" /><br />
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<button type="button" onclick="rebuildGraph()">Generate Tree</button>
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</span>
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<span style="display: inline-block; vertical-align: top; padding: 5px">
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<b>ForceDirectedLayout Properties</b><br />
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Max Iterations: <input type="text" size="5" id="maxIter" value="100" onchange="layout()" /><br />
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Epsilon: <input type="text" size="5" id="epsilon" value="1" onchange="layout()" /><br />
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Infinity: <input type="text" size="5" id="infinity" value="1000" onchange="layout()" /><br />
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ArrangementSpacing: <input type="text" size="8" id="arrangement" value="100 100" onchange="layout()" /><br />
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</span>
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<span style="display: inline-block; vertical-align: top; padding: 5px">
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<b>Vertex Properties</b><br />
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Electrical Charge: <input type="text" size="5" id="charge" value="150" onchange="layout()" /><br />
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Gravitational Mass: <input type="text" size="5" id="mass" value="0" onchange="layout()" /><br />
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</span>
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<span style="display: inline-block; vertical-align: top; padding: 5px">
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<b>Edge Properties</b><br />
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Spring Stiffness: <input type="text" size="5" id="stiffness" value="0.05" onchange="layout()" /><br />
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Spring Length: <input type="text" size="5" id="length" value="50" onchange="layout()" /><br />
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</span>
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</div>
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<div id="myDiagramDiv" style="background: white; border: solid 1px black; width: 100%; height: 500px"></div>
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<p>
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For information on <b>ForceDirectedLayout</b> and its properties, see the <a>ForceDirectedLayout</a> documentation page.
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</p>
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</div>
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</body>
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</html> |