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August 29, 2015 14:11
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This animation uses arcs instead of many short line segments with basis interpolation. The animation is done using the stroke-dasharray trick.
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<!doctype html> | |
<html lang="en"> | |
<head> | |
<meta charset="utf-8" /> | |
<title>Circle drawing animation in D3</title> | |
<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
<style> | |
.line { | |
stroke: blue; | |
stroke-width: 1.5px; | |
fill: white; | |
} | |
</style> | |
</head> | |
<body> | |
<div id="chart"> | |
<script language="javascript"> | |
var svg = d3.select("body").append("svg").append("g").attr("transform", "translate(100,50)") | |
var data = [ {a: 0}, {a: Math.PI / 2}, {a: Math.PI}, {a: 3*Math.PI/2}, {a: 2*Math.PI}] | |
var radial = d3.svg.arc() | |
.innerRadius(31) | |
.outerRadius(31) | |
.endAngle(function(d, i) { return data[(i+1) % data.length].a; }) | |
.startAngle(function(d, i) { return data[i].a; }) | |
var path = svg.selectAll(".arc") | |
.data(data) | |
.enter() | |
.append("path") | |
.attr("class", "line") | |
.attr("d", radial) | |
.each(function(d, i) { | |
var totalLength = this.getTotalLength(); | |
d3.select(this) | |
.attr("stroke-dasharray", totalLength + " " + totalLength) | |
.attr("stroke-dashoffset", totalLength) | |
.transition() | |
.duration(2000) | |
.delay(1000 * i) | |
.ease("linear") | |
.attr("stroke-dashoffset", 0); | |
}) | |
</script> | |
</body> | |
</html> |
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