mbostock/.block

## .block
license: gpl-3.0
redirect: https://observablehq.com/@d3/pie-chart

## README.md

      
    Raw
  

              README.md
            
          
    A minimalist pie chart rendered to Canvas using d3-shape.

  
## data.tsv

          
            age
            population

            
              <5
              2704659

            
              5-13
              4499890

            
              14-17
              2159981

            
              18-24
              3853788

            
              25-44
              14106543

            
              45-64
              8819342

            
              ≥65
              612463

## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<canvas width="960" height="500"></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 = ["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c", "#ff8c00"];

var arc = d3.arc()
    .outerRadius(radius - 10)
    .innerRadius(0)
    .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.population; });

context.translate(width / 2, height / 2);

d3.requestTsv("data.tsv", function(d) {
  d.population = +d.population;
  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.age, c[0], c[1]);
  });
});

</script>

## thumbnail.png

      
    Raw
  

              thumbnail.png
	license: gpl-3.0
	redirect: https://observablehq.com/@d3/pie-chart
	age	population
	<5	2704659
	5-13	4499890
	14-17	2159981
	18-24	3853788
	25-44	14106543
	45-64	8819342
	≥65	612463
	<!DOCTYPE html>
	<meta charset="utf-8">
	<canvas width="960" height="500"></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 = ["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c", "#ff8c00"];

	var arc = d3.arc()
	.outerRadius(radius - 10)
	.innerRadius(0)
	.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.population; });

	context.translate(width / 2, height / 2);

	d3.requestTsv("data.tsv", function(d) {
	d.population = +d.population;
	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.age, c[0], c[1]);
	});
	});

	</script>