Old school D3 from simpler times

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lcastrogarcia

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Canvas_Donut_gravite

A minimalist donut chart rendered to Canvas using d3-shape.

forked from mbostock's block: Canvas Donut

<!DOCTYPE html>
<meta charset="utf-8">
<canvas width="400" height="400"></canvas>
<script src="//d3js.org/d3.v4.0.0-alpha.4.min.js"></script>
<script>
var canvas = document.querySelector("canvas"),
    context = canvas.getContext("2d");
var width = canvas.width,
    height = canvas.height,
    radius = Math.min(width, height) / 2;
var colors = ["#5BC0EB", "#E55934", "#FDE74C", "#9BC53D"];

var arc = d3.arc()
    .outerRadius(radius - 10)
    .innerRadius(radius - 70)
    .context(context);
var labelArc = d3.arc()
    .outerRadius(radius - 40)
    .innerRadius(radius - 40)
    .context(context);
var pie = d3.pie()
    .sort(null)
    .value(function(d) { return d.quantite; });
context.translate(width / 2, height / 2);
d3.requestTsv("prepared_gravite", function(d) {
  d.quantite = +d.quantite;
  return d;
}, function(error, data) {
  if (error) throw error;
  var arcs = pie(data);
  arcs.forEach(function(d, i) {
    context.beginPath();
    arc(d);
    context.fillStyle = colors[i];
    context.fill();
  });
  context.beginPath();
  arcs.forEach(arc);
  context.strokeStyle = "#fff";
  context.stroke();
  context.textAlign = "center";
  context.textBaseline = "middle";
  context.fillStyle = "#000";
  arcs.forEach(function(d) {
    var c = labelArc.centroid(d);
    context.fillText(d.data.gravite, c[0], c[1]);
  });
});
</script>

https://d3js.org/d3.v4.0.0-alpha.4.min.js