stdclass/index.html

## index.html
<!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>

## thumbnail.png

      
    Raw
  

              thumbnail.png
	<!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>