d3/examples/pie/pie-transition.html

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HTML

<!DOCTYPE html>
<html>
<head>
<title>Pie Chart</title>
<script type="text/javascript" src="../../d3.js"></script>
<script type="text/javascript" src="../../d3.layout.js"></script>
<style type="text/css">
body {
font: 10px sans-serif;
}
</style>
</head>
<body>
<script type="text/javascript">
var w = 400,
h = 400,
r = Math.min(w, h) / 2,
data = d3.range(10).map(Math.random),
color = d3.scale.category20(),
arc = d3.svg.arc().outerRadius(r),
donut = d3.layout.pie();
var vis = d3.select("body")
.append("svg:svg")
.data([data.sort(d3.descending)])
.attr("width", w)
.attr("height", h);
var arcs = vis.selectAll("g.arc")
.data(donut)
.enter().append("svg:g")
.attr("class", "arc")
.attr("transform", "translate(" + r + "," + r + ")");
var paths = arcs.append("svg:path")
.attr("fill", function(d, i) { return color(i); });
paths.transition()
.ease("bounce")
.duration(2000)
.attrTween("d", tweenPie);
paths.transition()
.ease("elastic")
.delay(function(d, i) { return 2000 + i * 50; })
.duration(750)
.attrTween("d", tweenDonut);
function tweenPie(b) {
b.innerRadius = 0;
var i = d3.interpolate({startAngle: 0, endAngle: 0}, b);
return function(t) {
return arc(i(t));
};
}
function tweenDonut(b) {
b.innerRadius = r * .6;
var i = d3.interpolate({innerRadius: 0}, b);
return function(t) {
return arc(i(t));
};
}
</script>
</body>
</html>