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@eskim
Created October 16, 2012 13:04
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Untitled
body {
font-size: 10px;
color: red;
}
<!DOCTYPE html>
<html>
<body>
<h1>Hello</h1>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
<style type="text/css">
body {
font: 300 13px "Helvetica Neue", Helvetica;
}
form {
padding: 1em;
}
form, svg {
position: absolute;
}
path {
fill-rule: evenodd;
stroke: #333;
stroke-width: 2px;
}
.sun path {
fill: #6baed6;
}
.planet path {
fill: #9ecae1;
}
.ring path {
fill: #c6dbef;
}
</style>
</head>
<body>
<form>
Frame of Reference:<br>
<input type="radio" name="reference" id="ref-ring">
<label for="ref-ring">Annulus</label><br>
<input type="radio" name="reference" id="ref-planet" checked>
<label for="ref-planet">Planets</label><br>
<input type="radio" name="reference" id="ref-sun">
<label for="ref-sun">Sun</label>
</form>
<script type="text/javascript" src="http://mbostock.github.com/d3/d3.js?2.5.0"></script>
<script type="text/javascript">
var w = 960,
h = 500,
r = 80,
x = Math.sin(2 * Math.PI / 3),
y = Math.cos(2 * Math.PI / 3),
speed = 4,
start = Date.now();
var svg = d3.select("body").insert("svg:svg", "form")
.attr("width", w)
.attr("height", h)
.append("svg:g")
.attr("transform", "translate(" + w / 2 + "," + h / 2 + ")scale(.55)")
.append("svg:g")
.data([{radius: Infinity}]);
svg.append("svg:g")
.attr("class", "ring")
.data([{teeth: 80, radius: -r * 5, ring: true}])
.append("svg:path")
.attr("d", gear);
svg.append("svg:g")
.attr("class", "sun")
.data([{teeth: 16, radius: r}])
.append("svg:path")
.attr("d", gear);
svg.append("svg:g")
.attr("class", "planet")
.attr("transform", "translate(0,-" + r * 3 + ")")
.data([{teeth: 32, radius: -r * 2}])
.append("svg:path")
.attr("d", gear);
svg.append("svg:g")
.attr("class", "planet")
.attr("transform", "translate(" + -r * 3 * x + "," + -r * 3 * y + ")")
.data([{teeth: 32, radius: -r * 2}])
.append("svg:path")
.attr("d", gear);
svg.append("svg:g")
.attr("class", "planet")
.attr("transform", "translate(" + r * 3 * x + "," + -r * 3 * y + ")")
.data([{teeth: 32, radius: -r * 2}])
.append("svg:path")
.attr("d", gear);
d3.selectAll("input[name=reference]")
.data([r * 5, Infinity, -r])
.on("change", function(d) { svg.data([{radius: d}]); });
d3.selectAll("input[name=speed]")
.on("change", function() { speed = +this.value; });
function gear(d) {
var n = d.teeth,
r2 = Math.abs(d.radius),
r0 = r2 - 8,
r1 = r2 + 8,
r3 = d.ring ? (r3 = r0, r0 = r1, r1 = r3, r2 + 20) : 20,
da = Math.PI / n,
a0 = -Math.PI / 2 + (d.ring ? Math.PI / n : 0),
i = -1,
path = ["M", r0 * Math.cos(a0), ",", r0 * Math.sin(a0)];
while (++i < n) path.push(
"A", r0, ",", r0, " 0 0,1 ", r0 * Math.cos(a0 += da), ",", r0 * Math.sin(a0),
"L", r2 * Math.cos(a0), ",", r2 * Math.sin(a0),
"L", r1 * Math.cos(a0 += da / 3), ",", r1 * Math.sin(a0),
"A", r1, ",", r1, " 0 0,1 ", r1 * Math.cos(a0 += da / 3), ",", r1 * Math.sin(a0),
"L", r2 * Math.cos(a0 += da / 3), ",", r2 * Math.sin(a0),
"L", r0 * Math.cos(a0), ",", r0 * Math.sin(a0));
path.push("M0,", -r3, "A", r3, ",", r3, " 0 0,0 0,", r3, "A", r3, ",", r3, " 0 0,0 0,", -r3, "Z");
return path.join("");
}
d3.timer(function() {
var angle = (Date.now() - start) * speed,
transform = function(d) { return "rotate(" + angle / d.radius + ")"; };
svg.selectAll("path").attr("transform", transform);
svg.attr("transform", transform); // frame of reference
});
</script>
</body>
</html>
{"view":"split","fontsize":"80","seethrough":"","prefixfree":"1","page":"all"}
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