force-graph
Version:
2D force-directed graph rendered on HTML5 canvas
48 lines (37 loc) • 1.29 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 type="module">
import { forceCollide } from 'https://esm.sh/d3-force';
const N = 80;
const nodes = [...Array(N).keys()].map(() => ({
// Initial velocity in random direction
vx: (Math.random() * 2) - 1,
vy: (Math.random() * 2) - 1
}));
const Graph = new ForceGraph(document.getElementById('graph'));
Graph.cooldownTime(Infinity)
.d3AlphaDecay(0)
.d3VelocityDecay(0)
// Deactivate existing forces
.d3Force('center', null)
.d3Force('charge', null)
// Add collision and bounding box forces
.d3Force('collide', forceCollide(Graph.nodeRelSize()))
.d3Force('box', () => {
const SQUARE_HALF_SIDE = Graph.nodeRelSize() * N * 0.5;
nodes.forEach(node => {
const x = node.x || 0, y = node.y || 0;
// bounce on box walls
if (Math.abs(x) > SQUARE_HALF_SIDE) { node.vx *= -1; }
if (Math.abs(y) > SQUARE_HALF_SIDE) { node.vy *= -1; }
});
})
// Add nodes
.graphData({ nodes, links: [] });
</script>
</body>