A Voronoi diagram constructed from a phyllotaxis arrangement.
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March 9, 2019 17:37
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Phyllotaxis II
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| license: gpl-3.0 | |
| height: 960 | |
| redirect: https://observablehq.com/@mbostock/phyllotaxis |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| path { | |
| fill: none; | |
| stroke: #000; | |
| stroke-width: 1px; | |
| pointer-events: all; | |
| } | |
| path:hover { | |
| fill: orange; | |
| } | |
| </style> | |
| <body> | |
| <canvas width="960" height="960"></canvas> | |
| <script src="//d3js.org/d3-voronoi.v0.3.min.js"></script> | |
| <script> | |
| var canvas = document.querySelector("canvas"), | |
| width = canvas.width, | |
| height = canvas.height, | |
| context = canvas.getContext("2d"); | |
| var spacing = 6, | |
| radius = Math.sqrt(width * width + height * height) / 3 + spacing, | |
| theta = Math.PI * (3 - Math.sqrt(5)), | |
| sites = []; | |
| for (var i = 0, r, a, x, y; (r = spacing * Math.sqrt(i)) < radius; ++i) { | |
| x = width / 2 + r * Math.cos(a = i * theta); | |
| if (-spacing > x || x > width + spacing) continue; | |
| y = height / 2 + r * Math.sin(a); | |
| if (-spacing > y || y > height + spacing) continue; | |
| sites.push([x, y]); | |
| } | |
| var cells = d3_voronoi.voronoi() | |
| .extent([[-1, -1], [width + 1, height + 1]]) | |
| .polygons(sites); | |
| context.beginPath(); | |
| cells.forEach(function(cell) { drawPolygon(cell); }); | |
| context.lineWidth = 0.5; | |
| context.stroke(); | |
| sites.forEach(function(site) { drawPoint(site); }); | |
| function drawPoint(point) { | |
| context.fillRect(Math.floor(point[0]), Math.floor(point[1]), 1, 1); | |
| } | |
| function drawPolygon(points) { | |
| context.moveTo(points[0][0], points[0][1]); | |
| for (var i = 1, n = points.length; i < n; ++i) context.lineTo(points[i][0], points[i][1]); | |
| context.closePath(); | |
| } | |
| </script> |
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