Based on Jason Davies’ earlier Sunflower Phyllotaxis.
Last active
March 23, 2018 08:45
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Phyllotaxis
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| background: #333; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v4.0.0-alpha.29.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500, | |
| radius = Math.sqrt(width / 2 * width / 2 + height / 2 * height / 2) + 5; | |
| var theta = Math.PI * (3 - Math.sqrt(5)), | |
| spacing = 4, | |
| size = spacing - 1, | |
| speed = 1, | |
| index = 0, | |
| total = (radius * radius) / (spacing * spacing); | |
| var color = d3.scaleRainbow() | |
| .domain([0, 360]); | |
| var canvas = d3.select("body").append("canvas") | |
| .attr("width", radius * 2) | |
| .attr("height", radius * 2) | |
| .style("position", "absolute") | |
| .style("left", width / 2 - radius + "px") | |
| .style("top", height / 2 - radius + "px") | |
| .style("transform-origin", radius + "px " + radius + "px"); | |
| var context = canvas.node().getContext("2d"); | |
| context.translate(radius, radius); | |
| d3.timer(function() { | |
| canvas.style("transform", "rotate(" + -speed / 2 + "deg)"); | |
| for (var j = 0; index < total && j < speed; ++j) { | |
| var radius = spacing * Math.sqrt(++index), | |
| angle = index * theta, | |
| x = radius * Math.cos(angle), | |
| y = radius * Math.sin(angle); | |
| context.beginPath(); | |
| context.arc(x, y, size, 0, 2 * Math.PI); | |
| context.stroke(); | |
| context.fillStyle = color(angle * 180 / Math.PI - radius); | |
| context.fill(); | |
| } | |
| speed += .1; | |
| }); | |
| </script> |
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