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@mbostock mbostock/.block
Last active May 7, 2017

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Vector Tiles
license: gpl-3.0
d3.geo.tile=function(){function t(){var t=Math.max(Math.log(n)/Math.LN2-8,0),h=Math.round(t+e),o=Math.pow(2,t-h+8),u=[(r[0]-n/2)/o,(r[1]-n/2)/o],l=[],c=d3.range(Math.max(0,Math.floor(-u[0])),Math.max(0,Math.ceil(a[0]/o-u[0]))),M=d3.range(Math.max(0,Math.floor(-u[1])),Math.max(0,Math.ceil(a[1]/o-u[1])));return M.forEach(function(t){c.forEach(function(a){l.push([a,t,h])})}),l.translate=u,l.scale=o,l}var a=[960,500],n=256,r=[a[0]/2,a[1]/2],e=0;return t.size=function(n){return arguments.length?(a=n,t):a},t.scale=function(a){return arguments.length?(n=a,t):n},t.translate=function(a){return arguments.length?(r=a,t):r},t.zoomDelta=function(a){return arguments.length?(e=+a,t):e},t};
<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
margin: 0;
}
path {
fill: none;
stroke: #000;
stroke-linejoin: round;
stroke-linecap: round;
}
.major_road { stroke: #776; }
.minor_road { stroke: #ccb; }
.highway { stroke: #f39; stroke-width: 1.5px; }
.rail { stroke: #7de; }
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="d3.geo.tile.min.js"></script>
<script>
var width = Math.max(960, window.innerWidth),
height = Math.max(500, window.innerHeight);
var tiler = d3.geo.tile()
.size([width, height]);
var projection = d3.geo.mercator()
.center([-122.4183, 37.7750])
.scale((1 << 21) / 2 / Math.PI)
.translate([width / 2, height / 2]);
var path = d3.geo.path()
.projection(projection);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
svg.selectAll("g")
.data(tiler
.scale(projection.scale() * 2 * Math.PI)
.translate(projection([0, 0])))
.enter().append("g")
.each(function(d) {
var g = d3.select(this);
d3.json("https://vector.mapzen.com/osm/roads/" + d[2] + "/" + d[0] + "/" + d[1] + ".json?api_key=vector-tiles-LM25tq4", function(error, json) {
if (error) throw error;
g.selectAll("path")
.data(json.features.sort(function(a, b) { return a.properties.sort_key - b.properties.sort_key; }))
.enter().append("path")
.attr("class", function(d) { return d.properties.kind; })
.attr("d", path);
});
});
</script>
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