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@mbostock

mbostock/.block

Last active Mar 22, 2019
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Raster & Vector I
license: gpl-3.0
height: 960
redirect: https://observablehq.com/@d3/raster-vector
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<!DOCTYPE html>
<meta charset="utf-8">
<style>
#streets {
fill: none;
stroke: black;
stroke-width: 1.5px;
stroke-linejoin: round;
}
</style>
<svg width="960" height="960"></svg>
<script src="//d3js.org/d3.v4.min.js"></script>
<script src="//d3js.org/d3-tile.v0.0.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>
var pi = Math.PI,
tau = 2 * pi;
var svg = d3.select("svg"),
width = +svg.attr("width"),
height = +svg.attr("height");
var projection = d3.geoMercator()
.scale((1 << 18) / tau)
.translate([width / 2, height / 2])
.center([-83.15, 42.43]);
var path = d3.geoPath()
.projection(projection);
d3.json("detroit.json", function(error, detroit) {
if (error) throw error;
var tiles = d3.tile()
.size([width, height])
.scale(projection.scale() * tau)
.translate(projection([0, 0]))
();
svg.selectAll("image")
.data(tiles)
.enter().append("image")
.attr("xlink:href", function(d) { return "http://" + "abc"[d[1] % 3] + ".tile.openstreetmap.org/" + d[2] + "/" + d[0] + "/" + d[1] + ".png"; })
.attr("x", function(d) { return (d[0] + tiles.translate[0]) * tiles.scale; })
.attr("y", function(d) { return (d[1] + tiles.translate[1]) * tiles.scale; })
.attr("width", tiles.scale)
.attr("height", tiles.scale);
svg.append("path")
.attr("id", "streets")
.datum(topojson.mesh(detroit, detroit.objects.detroit))
.attr("d", path);
});
</script>
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