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October 1, 2016 09:52
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Hello bl.ocks
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
body { | |
background: #FFF; | |
} | |
rect { | |
fill: none; | |
stroke: #000; | |
stroke-width: 2.5px; | |
} | |
.square:nth-child(2n + 1) rect { | |
stroke: #f88; | |
} | |
</style> | |
<body> | |
<script src="//d3js.org/d3.v3.min.js"></script> | |
<script> | |
var w = 960, | |
h = 500, | |
start = Date.now(); | |
var rings = [ | |
{radius: 65 * 1, width: 16, speed: 0}, | |
{radius: 65 * 2, width: 16, speed: 0}, | |
{radius: 65 * 3, width: 32, speed: 0}, | |
{radius: 65 * 4, width: 16, speed: 1e-2}, | |
{radius: 65 * 5, width: 16, speed: 0}, | |
{radius: 65 * 6, width: 16, speed: 1e-2} | |
]; | |
var svg = d3.select("body").append("svg") | |
.attr("width", w) | |
.attr("height", h) | |
.append("g") | |
.attr("transform", "translate(" + w / 2 + "," + h / 2 + ")scale(.6)"); | |
var ring = svg.selectAll("g") | |
.data(rings) | |
.enter().append("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); | |
}); | |
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("g") | |
.attr("class", "square") | |
.attr("transform", function(_, i) { return "rotate(" + i * k + ")translate(" + d.radius + ")"; }) | |
.append("rect") | |
.attr("x", -d.width / 2) | |
.attr("y", -d.width / 2) | |
.attr("width", d.width) | |
.attr("height", d.width); | |
} | |
</script> |
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