D3 Examples - WWSD #13: d3 + Canvas

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
path {
  fill: #ccc;
  stroke: #fff;
  stroke-width: .5px;
}
​
path:hover {
  fill: red;
}
​
</style>
<body>
  <canvas></canvas>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>
​
var width = 960,
    height = 500;
​
var canvas = d3.select("canvas").node()
canvas.width = width;
canvas.height = height;
var ctx = canvas.getContext('2d')
var path = d3.geo.path()
  .context(ctx)
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
var url = "https://gist.githubusercontent.com/mbostock/4090846/raw/d534aba169207548a8a3d670c9c2cc719ff05c47/us.json"
d3.json(url, function(error, topology) {
  if (error) throw error;
  
  console.log("topojson", topology)
  var geojson = topojson.feature(topology, topology.objects.counties);
  console.log("geojson", geojson)
​
  ctx.strokeStyle = "#111";
  ctx.fillStyle = "#99ffe8"
  geojson.features.forEach(function(feature) {
    ctx.beginPath()
    path(feature)
    ctx.fill()
    ctx.stroke();
  })
});
​
</script>
​
    
WWSD #13: d3 + Canvas

Working with spatial data

Example #13
