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<head>
<meta charset="utf-8">
<script src="https://d3js.org/d3.v4.min.js"></script>
<style>
body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
svg {
width: 100%;
height: 100%;
}
</style>
</head>
<body>
<svg></svg>
<script>
var colors = d3.scaleOrdinal(d3.schemeCategory10); //maps integers to colors
var data = [1, 1, 2, 3, 5, 8, 13, 21]; //data we want to turn into a pie chart
var pies = d3.pie()(data); // turns into data for pie chart with start and end angles
var arc = d3.arc()
.innerRadius(0) //means full circle. if not 0, would be donut
.outerRadius(150) //size of circle
.startAngle(d =>d.startAngle) //how does it get d???
.endAngle(d=> d.endAngle);
var svg = d3.select('svg')
.append('g')
.attr('transform', 'translate(200,200)');
svg.selectAll('path')
.data(pies).enter().append('path')
.attr('d', arc)
.attr('fill', (d, i) => colors(d.value))
.attr('stroke', '#fff')
</script>
</body>
https://d3js.org/d3.v4.min.js