<!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++;
}
// specify options
var options = {
width: '600px',
height: '600px',
stabilize: false,
nodes: {
style: 'dot'
},
edges: {
length: 50
}
};
// Instantiate our graph object.
graph = new vis.Graph(document.getElementById('mygraph'));
// Draw our graph with the created data and options
graph.draw(nodes, edges, 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>