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mbostock/.block

Last active January 23, 2020 07:32
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d3.geoPath + Canvas
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.block
license: gpl-3.0
height: 600
border: no
redirect: https://observablehq.com/@d3/u-s-map-canvas
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README.md
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index.html
<!DOCTYPE html>
<canvas width="960" height="600"></canvas>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://unpkg.com/topojson-client@3"></script>
<script>
var context = d3.select("canvas").node().getContext("2d"),
path = d3.geoPath().context(context);
d3.json("https://unpkg.com/us-atlas@1/us/10m.json", function(error, us) {
if (error) throw error;
context.beginPath();
path(topojson.mesh(us));
context.stroke();
});
</script>
@wangjiaji
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It should be noted that beginPath() should be called manually if you want to redraw after panning or zooming.

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