Created
September 15, 2015 18:47
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
body { | |
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; | |
width: 960px; | |
height: 500px; | |
position: relative; | |
} | |
form { | |
position: absolute; | |
top: 1em; | |
left: 1em; | |
} | |
path { | |
fill-rule: evenodd; | |
stroke: #333; | |
stroke-width: 2px; | |
} | |
.sun path { | |
fill: #6baed6; | |
} | |
.planet path { | |
fill: #9ecae1; | |
} | |
.annulus path { | |
fill: #c6dbef; | |
} | |
</style> | |
<form> | |
<input type="radio" name="reference" id="ref-annulus"> | |
<label for="ref-annulus">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 src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
<script> | |
var width = 960, | |
height = 500, | |
radius = 80, | |
x = Math.sin(2 * Math.PI / 3), | |
y = Math.cos(2 * Math.PI / 3); | |
var offset = 0, | |
speed = 4, | |
start = Date.now(); | |
var svg = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height) | |
.append("g") | |
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")scale(.55)") | |
.append("g"); | |
var frame = svg.append("g") | |
.datum({radius: Infinity}); | |
frame.append("g") | |
.attr("class", "annulus") | |
.datum({teeth: 80, radius: -radius * 5, annulus: true}) | |
.append("path") | |
.attr("d", gear); | |
frame.append("g") | |
.attr("class", "sun") | |
.datum({teeth: 16, radius: radius}) | |
.append("path") | |
.attr("d", gear); | |
frame.append("g") | |
.attr("class", "planet") | |
.attr("transform", "translate(0,-" + radius * 3 + ")") | |
.datum({teeth: 32, radius: -radius * 2}) | |
.append("path") | |
.attr("d", gear); | |
frame.append("g") | |
.attr("class", "planet") | |
.attr("transform", "translate(" + -radius * 3 * x + "," + -radius * 3 * y + ")") | |
.datum({teeth: 32, radius: -radius * 2}) | |
.append("path") | |
.attr("d", gear); | |
frame.append("g") | |
.attr("class", "planet") | |
.attr("transform", "translate(" + radius * 3 * x + "," + -radius * 3 * y + ")") | |
.datum({teeth: 32, radius: -radius * 2}) | |
.append("path") | |
.attr("d", gear); | |
d3.selectAll("input[name=reference]") | |
.data([radius * 5, Infinity, -radius]) | |
.on("change", function(radius1) { | |
var radius0 = frame.datum().radius, angle = (Date.now() - start) * speed; | |
frame.datum({radius: radius1}); | |
svg.attr("transform", "rotate(" + (offset += angle / radius0 - angle / radius1) + ")"); | |
}); | |
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.annulus ? (r3 = r0, r0 = r1, r1 = r3, r2 + 20) : 20, | |
da = Math.PI / n, | |
a0 = -Math.PI / 2 + (d.annulus ? 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 + ")"; }; | |
frame.selectAll("path").attr("transform", transform); | |
frame.attr("transform", transform); // frame of reference | |
}); | |
</script> |
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