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83 lines
1.9 KiB
83 lines
1.9 KiB
4 years ago
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<!DOCTYPE html>
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<meta charset="utf-8">
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<canvas width="960" height="600"></canvas>
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<script src="https://d3js.org/d3.v4.min.js"></script>
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<script>
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var canvas = document.querySelector("canvas"),
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context = canvas.getContext("2d"),
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width = canvas.width,
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height = canvas.height;
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var simulation = d3.forceSimulation()
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.force("link", d3.forceLink().id(function(d) { return d.id; }))
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.force("charge", d3.forceManyBody())
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.force("center", d3.forceCenter(width / 2, height / 2));
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d3.json("test.json", function(error, graph) {
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if (error) throw error;
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simulation
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.nodes(graph.nodes)
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.on("tick", ticked);
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simulation.force("link")
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.links(graph.links);
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d3.select(canvas)
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.call(d3.drag()
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.container(canvas)
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.subject(dragsubject)
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.on("start", dragstarted)
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.on("drag", dragged)
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.on("end", dragended));
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function ticked() {
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context.clearRect(0, 0, width, height);
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context.beginPath();
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graph.links.forEach(drawLink);
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context.strokeStyle = "#aaa";
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context.stroke();
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context.beginPath();
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graph.nodes.forEach(drawNode);
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context.fill();
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context.strokeStyle = "#fff";
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context.stroke();
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}
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function dragsubject() {
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return simulation.find(d3.event.x, d3.event.y);
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}
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});
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function dragstarted() {
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if (!d3.event.active) simulation.alphaTarget(0.3).restart();
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d3.event.subject.fx = d3.event.subject.x;
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d3.event.subject.fy = d3.event.subject.y;
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}
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function dragged() {
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d3.event.subject.fx = d3.event.x;
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d3.event.subject.fy = d3.event.y;
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}
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function dragended() {
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if (!d3.event.active) simulation.alphaTarget(0);
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d3.event.subject.fx = null;
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d3.event.subject.fy = null;
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}
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function drawLink(d) {
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context.moveTo(d.source.x, d.source.y);
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context.lineTo(d.target.x, d.target.y);
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}
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function drawNode(d) {
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context.moveTo(d.x + 3, d.y);
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context.arc(d.x, d.y, 3, 0, 2 * Math.PI);
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}
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</script>
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