<!doctype html>
<html>
<head>
    <title>Graph | Fully random nodes clustering</title>

    <style type="text/css">
        body {
            font: 10pt sans;
        }
        #mygraph {
            width: 600px;
            height: 600px;
            border: 1px solid lightgray;
        }
    </style>

    <script type="text/javascript" src="../../dist/vis.js"></script>

    <script type="text/javascript">
        var nodes = null;
        var edges = null;
        var graph = null;

        function draw() {
            nodes = [];
            edges = [];
            // randomly create some nodes and edges
            var nodeCount = parseInt(document.getElementById('nodeCount').value);

            for (var i = 0; i < nodeCount; i++) {
                nodes.push({
                    id: i,
                    label: String(i)
                });
            }
            for (var i = 0; i < nodeCount; i++) {
                var from = i;
                var to = i;
                to = i;
                while (to == i) {
                    to = Math.floor(Math.random() * (nodeCount));
                }
                edges.push({
                    from: from,
                    to: to
                });
            }
            // create a graph
            var clusteringOn = document.getElementById('clustering').checked;
            var container = document.getElementById('mygraph');
            var data = {
                nodes: nodes,
                edges: edges
            };
            var options = {
                edges: {
                    length: 80
                },
                clustering: {
                    enabled: clusteringOn
                },
                stabilize: false
            };
            graph = new vis.Graph(container, data, options);

            // add event listeners
            graph.on('select', function(params) {
                document.getElementById('selection').innerHTML = 'Selection: ' + params.nodes;
            });
        }
    </script>
</head>

<body onload="draw();">
<h2>Clustering - Fully random graph</h2>
<div style="width:700px; font-size:14px;">
    This example shows a fully randomly generated set of nodes and connected edges.
    By clicking the checkbox you can turn clustering on and off. If you increase the number of nodes to
    a value higher than 100, automatic clustering is used before the initial draw (assuming the checkbox is checked).
    <br />
    <br />
    Clustering is done automatically when zooming out. When zooming in over the cluster, the cluster pops open. When the cluster is very big, a special instance
    will be created and the cluster contents will only be simulated in there. Double click will also open a cluster.
    <br />
    <br />
    Try values of 500 and 5000 with and without clustering. All thresholds can be changed to suit your dataset.
</div>
<br />
<form onsubmit="draw(); return false;">
    <label for="nodeCount">Number of nodes:</label>
    <input id="nodeCount" type="text" value="50" style="width: 50px;">
    <label for="clustering">Enable Clustering:</label>
    <input id="clustering" type="checkbox" onChange="draw()" checked="true">
    <input type="submit" value="Go">
</form>
<br>

<div id="mygraph"></div>

<p id="selection"></p>
</body>
</html>