Adapting the earlier OSM vector tiles example to show how to render multiple layers.
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February 9, 2016 02:03
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Vector Tiles
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| license: gpl-3.0 |
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| 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}; |
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| <!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; } | |
| .buildings path { stroke: none; fill: black; } | |
| </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([-122.41, 37.79]) | |
| .scale((1 << 23) / 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) | |
| .call(renderTiles, "highroad") | |
| .call(renderTiles, "buildings"); | |
| function renderTiles(svg, type) { | |
| svg.append("g") | |
| .attr("class", type) | |
| .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("http://" + ["a", "b", "c"][(d[0] * 31 + d[1]) % 3] + ".tile.openstreetmap.us/vectiles-" + type + "/" + d[2] + "/" + d[0] + "/" + d[1] + ".json", function(error, json) { | |
| 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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