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richardwestenra/index.html

Created June 25, 2015 10:22
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d3.geo.path + canvas + pattern image fill
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index.html
<!DOCTYPE html>
<meta charset="utf-8">
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.19/topojson.min.js"></script>
<script>
var width = 960,
height = 500;
var projection = d3.geo.albers()
.scale(1000);
var canvas = d3.select("body").append("canvas")
.attr("width", width)
.attr("height", height);
var context = canvas.node().getContext("2d");
var path = d3.geo.path()
.projection(projection)
.context(context);
d3.json("us.json", function(error, us) {
if (error) { throw error; }
var imageObj = new Image();
imageObj.onload = function() {
var pattern = context.createPattern(imageObj, 'repeat');
path(topojson.feature(us, us.objects.counties));
context.fillStyle = pattern;
context.fill();
};
imageObj.src = 'http://lorempixel.com/output/abstract-q-c-640-480-6.jpg';
});
</script>
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us.json
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