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Square Circle Spiral Illusion
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/> | |
| <style type="text/css"> | |
| body { | |
| background: #888; | |
| } | |
| rect { | |
| fill: none; | |
| stroke: #000; | |
| stroke-width: 2.5px; | |
| } | |
| .square:nth-child(2n + 1) rect { | |
| stroke: #fff; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script type="text/javascript" src="http://mbostock.github.com/d3/d3.js?2.5.1"></script> | |
| <script type="text/javascript"> | |
| var w = 960, | |
| h = 500, | |
| start = Date.now(); | |
| var rings = [ | |
| {radius: 65 * 1, width: 16, speed: -3e-2}, | |
| {radius: 65 * 2, width: 16, speed: -2e-2}, | |
| {radius: 65 * 3, width: 16, speed: -1e-2}, | |
| {radius: 65 * 4, width: 16, speed: 1e-2}, | |
| {radius: 65 * 5, width: 16, speed: 2e-2}, | |
| {radius: 65 * 6, width: 16, speed: 3e-2}, | |
| {radius: 65 * 7, width: 16, speed: 4e-2}, | |
| {radius: 65 * 8, width: 16, speed: 5e-2}, | |
| {radius: 65 * 9, width: 16, speed: 6e-2} | |
| ]; | |
| var svg = d3.select("body").append("svg:svg") | |
| .attr("width", w) | |
| .attr("height", h) | |
| .append("svg:g") | |
| .attr("transform", "translate(" + w / 2 + "," + h / 2 + ")scale(.6)"); | |
| var ring = svg.selectAll("g") | |
| .data(rings) | |
| .enter().append("svg:g") | |
| .attr("class", "ring") | |
| .each(ringEnter); | |
| d3.timer(function() { | |
| var elapsed = Date.now() - start, | |
| rotate = function(d) { return "rotate(" + d.speed * elapsed + ")"; }; | |
| ring | |
| .attr("transform", rotate) | |
| .selectAll("rect") | |
| .attr("transform", rotate); | |
| }); | |
| function ringEnter(d, i) { | |
| var n = Math.floor(2 * Math.PI * d.radius / d.width * Math.SQRT1_2), | |
| k = 360 / n; | |
| d3.select(this).selectAll("g") | |
| .data(d3.range(n).map(function() { return d; })) | |
| .enter().append("svg:g") | |
| .attr("class", "square") | |
| .attr("transform", function(_, i) { return "rotate(" + i * k + ")translate(" + d.radius + ")"; }) | |
| .append("svg:rect") | |
| .attr("x", -d.width / 2) | |
| .attr("y", -d.width / 2) | |
| .attr("width", d.width) | |
| .attr("height", d.width); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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