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Last active 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.
Raw
index.html
<!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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