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 hidden or 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.v4.0.0-alpha.40.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) | |
| .drag(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 + 0.5; }).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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