This example uses d3.forceCollide to prevent circles from overlapping.
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Collision Detection
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| license: gpl-3.0 | |
| height: 960 |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <canvas width="960" height="960"></canvas> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var canvas = document.querySelector("canvas"), | |
| context = canvas.getContext("2d"), | |
| width = canvas.width, | |
| height = canvas.height, | |
| tau = 2 * Math.PI; | |
| var nodes = d3.range(1000).map(function(i) { | |
| return { | |
| r: Math.random() * 14 + 4 | |
| }; | |
| }); | |
| var simulation = d3.forceSimulation(nodes) | |
| .velocityDecay(0.2) | |
| .force("x", d3.forceX().strength(0.002)) | |
| .force("y", d3.forceY().strength(0.002)) | |
| .force("collide", d3.forceCollide().radius(function(d) { return d.r + 5; }).iterations(2)) | |
| .on("tick", ticked); | |
| function ticked() { | |
| context.clearRect(0, 0, width, height); | |
| context.save(); | |
| context.translate(width / 2, height / 2); | |
| context.beginPath(); | |
| nodes.forEach(function(d) { | |
| context.moveTo(d.x + d.r, d.y); | |
| context.arc(d.x, d.y, d.r, 0, tau); | |
| }); | |
| context.fillStyle = "#ddd"; | |
| context.fill(); | |
| context.strokeStyle = "#333"; | |
| context.stroke(); | |
| context.restore(); | |
| } | |
| </script> |
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