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- <!doctype html>
- <html>
- <head>
- <title>Graph | Groups</title>
-
- <style>
- body {font: 10pt arial;}
- </style>
-
- <script type="text/javascript" src="http://www.google.com/jsapi"></script>
- <script type="text/javascript" src="../../vis.js"></script>
-
- <script type="text/javascript">
- var nodes = null;
- var edges = null;
- var graph = null;
-
- google.load('visualization', '1');
-
- // Set callback to run when API is loaded
- google.setOnLoadCallback(draw);
-
- // Called when the Visualization API is loaded.
- function draw() {
- var from, to;
-
- nodes = [];
- edges = [];
-
- var color = 'gray';
- var len = undefined;
-
- // randomly create some nodes
- var nodeCount = parseInt(document.getElementById('nodeCount').value);
- var nodeOffset = 0;
- var groupMin = 0;
- var groupMax = parseInt(document.getElementById('groupCount').value);
- var group = groupMin;
- var groupLeader = []; // will contain the node id with the most links of each group
- while (group < groupMax) {
- // randomly create some nodes
- var i = 0;
- var cols = parseInt(Math.sqrt(nodeCount));
- var connectionCount = [];
- while (i < nodeCount) {
- nodes.push({
- id: i + nodeOffset,
- text: String(i + nodeOffset),
- group: group
- });
- connectionCount[i] = 0;
-
- // create links in a scale-free-graph way
- if (i == 1) {
- from = i;
- to = 0;
- edges.push({
- from: from + nodeOffset,
- to: to + nodeOffset,
- length: len,
- color: color
- });
- connectionCount[from]++;
- connectionCount[to]++;
- }
- else if (i > 1) {
- var conn = (i - 1) * 2;
- var rand = Math.floor(Math.random() * conn);
- var cum = 0;
- var j = 0;
- while (j < connectionCount.length && cum < rand) {
- cum += connectionCount[j];
- j++;
- }
-
- from = i;
- to = j;
- edges.push({
- from: from + nodeOffset,
- to: to + nodeOffset,
- length: len,
- color: color
- });
- connectionCount[from]++;
- connectionCount[to]++;
- }
-
- i++;
- }
-
- // calculate the node with the most number of connections
- var leader = 0;
- for (var c in connectionCount) {
- if (connectionCount.hasOwnProperty(c)) {
- if (connectionCount[c] > connectionCount[leader]) {
- leader = parseInt(c);
- }
- }
- }
-
- if (group > groupMin) {
- // connect to the leader of this group to the leader of a random other group
- from = leader + nodeOffset;
- to = groupLeader[groupMin + parseInt(Math.random() * (group - groupMin))];
- edges.push({
- from: from,
- to: to,
- length: len,
- color: color
- });
- }
-
- // add this leader to the list
- groupLeader[group] = leader + nodeOffset;
-
- nodeOffset += nodeCount;
- group++;
- }
-
- // create a graph
- var container = document.getElementById('mygraph');
- var data = {
- nodes: nodes,
- edges: edges
- };
- var options = {
- width: '600px',
- height: '600px',
- stabilize: false,
- nodes: {
- style: 'dot'
- },
- edges: {
- length: 50
- }
- };
- graph = new vis.Graph(container, data, options);
- }
- </script>
- </head>
-
- <body onload="draw()">
- <form onsubmit= "javascript: draw(); return false;">
- Number of groups:
- <input type="text" value="6" id="groupCount" style="width: 50px;">
- Number of nodes per group:
- <input type="text" value="7" id="nodeCount" style="width: 50px;">
- <input type="submit" value="Go">
- </form>
- <br>
-
- <div id="mygraph"></div>
-
- </body>
- </html>
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