D3byEX 9.7: Pie (Adapted to D3.js v4)
<!DOCTYPE html>
<html><meta charset=utf-8>
<head>
<meta name="description" content="D3.js v4, arc, pie" />
</head>
<body>
<script src="http://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/d3-selection-multi.v1.min.js"></script>
<script>
var group = d3.select('body')
.append('svg')
.attrs({ width: 225, height: 225 })
.append('g')
.attr('transform', 'translate(105, 105)');
var data = [21, 32, 35, 64, 83];
var pieSegments = d3.pie()(data);
var arcGenerator = d3.arc()
.innerRadius(0)
.outerRadius(100)
.startAngle(function (d) { return d.startAngle; })
.endAngle(function (d) { return d.endAngle; });
var colors = d3.scaleOrdinal(d3.schemeCategory10);
group.selectAll('path')
.data(pieSegments)
.enter()
.append('path')
.attrs({ d: arcGenerator,
fill: function (d, i) { return colors(i); }
});
</script>
</body>
</html>