forked from mbostock's block: Delaunay Force Mesh
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January 4, 2018 00:47
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Delaunay Force Mesh
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <style> | |
| canvas { | |
| background-color: beige; | |
| } | |
| </style> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| const width = 960; | |
| const height = 500; | |
| const tau = 2 * Math.PI; | |
| const random = (mult) => () => Math.random() * mult; | |
| const randomW = random(width); | |
| const randomH = random(height); | |
| const numberOfNodes = 200; | |
| const nodes = d3 | |
| .range(numberOfNodes) | |
| .map(() => ({ | |
| x: randomW(), | |
| y: randomH(), | |
| })); | |
| const voronoi = d3 | |
| .geom | |
| .voronoi() | |
| .x(d => d.x) | |
| .y(d => d.y); | |
| const leftNodes = nodes.slice(0, numberOfNodes / 2); | |
| const rightNodes = nodes.slice(numberOfNodes / 2); | |
| const leftLinks = voronoi.links(leftNodes); | |
| const rightLinks = voronoi.links(rightNodes); | |
| const canvas = d3 | |
| .select('body') | |
| .append('canvas') | |
| .attr('width', width) | |
| .attr('height', height); | |
| const context = canvas.node().getContext('2d'); | |
| const makeTicked = (nodes, links) => () => { | |
| context.clearRect(0, 0, width, height); | |
| context.beginPath(); | |
| links.forEach(function(d) { | |
| context.moveTo(d.source.x, d.source.y); | |
| context.lineTo(d.target.x, d.target.y); | |
| }); | |
| context.lineWidth = 1; | |
| context.strokeStyle = "#bbb"; | |
| context.stroke(); | |
| context.beginPath(); | |
| nodes.forEach(function(d) { | |
| context.moveTo(d.x, d.y); | |
| context.arc(d.x, d.y, 2, 0, tau); | |
| }); | |
| context.lineWidth = 3; | |
| context.strokeStyle = "#fff"; | |
| context.stroke(); | |
| context.fillStyle = "#000"; | |
| context.fill(); | |
| }; | |
| const leftForce = d3.layout.force() | |
| .size([0, height]) | |
| .linkDistance(20) | |
| .charge(-70) | |
| .nodes(leftNodes) | |
| .links(leftLinks) | |
| .on('tick', makeTicked(leftNodes, leftLinks)) | |
| .start(); | |
| const rightForce = d3.layout.force() | |
| .size([width, height]) | |
| .linkDistance(20) | |
| .charge(-70) | |
| .nodes(rightNodes) | |
| .links(rightLinks) | |
| .on('tick', makeTicked(rightNodes, rightLinks)) | |
| .start(); | |
| </script> |
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