force-graph
Version:
2D force-directed graph rendered on HTML5 canvas
43 lines (37 loc) • 1.48 kB
HTML
<head>
<style> body { margin: 0; } </style>
<script src="//cdn.jsdelivr.net/npm/force-graph"></script>
<!--<script src="../../dist/force-graph.js"></script>-->
</head>
<body>
<div id="graph"></div>
<script>
// Random tree
const N = 20;
const gData = {
nodes: [...Array(N).keys()].map(i => ({ id: i })),
links: [...Array(N).keys()]
.filter(id => id)
.map(id => ({
source: id,
target: Math.round(Math.random() * (id-1))
}))
};
// gen a number persistent color from around the palette
const getColor = n => '#' + ((n * 1234567) % Math.pow(2, 24)).toString(16).padStart(6, '0');
const Graph = new ForceGraph(document.getElementById('graph'))
.nodeCanvasObject((node, ctx) => nodePaint(node, getColor(node.id), ctx))
.nodePointerAreaPaint(nodePaint)
.nodeLabel('id')
.graphData(gData);
function nodePaint({ id, x, y }, color, ctx) {
ctx.fillStyle = color;
[
() => { ctx.fillRect(x - 6, y - 4, 12, 8); }, // rectangle
() => { ctx.beginPath(); ctx.moveTo(x, y - 5); ctx.lineTo(x - 5, y + 5); ctx.lineTo(x + 5, y + 5); ctx.fill(); }, // triangle
() => { ctx.beginPath(); ctx.arc(x, y, 5, 0, 2 * Math.PI, false); ctx.fill(); }, // circle
() => { ctx.font = '10px Sans-Serif'; ctx.textAlign = 'center'; ctx.textBaseline = 'middle'; ctx.fillText('Text', x, y); } // text
][id%4]();
}
</script>
</body>