You can display map tiles with d3-tile, and then overlay them with TopoJSON vectors.
Tiles copyright OpenStreetMap contributors.
Last active
August 2, 2017 11:41
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Open Street Map Tiles
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <style> | |
| body { | |
| margin: 0; | |
| } | |
| .subunit { | |
| fill: none; | |
| stroke: steelblue; | |
| stroke-width: 3px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.20/topojson.min.js"></script> | |
| <script src="https://unpkg.com/d3-marcon@2.0.1/build/d3-marcon.min.js"></script> | |
| <script src="https://d3js.org/d3-tile.v0.0.min.js"></script> | |
| <script> | |
| var m = d3.marcon().width(window.innerWidth).height(window.innerHeight); | |
| m.render(); | |
| var width = m.innerWidth(), height = m.innerHeight(), svg = m.svg(); | |
| var projection = d3.geoMercator(); | |
| var path = d3.geoPath() | |
| .projection(projection); | |
| d3.queue() | |
| .defer(d3.json, "delhi_ward_outline.json") | |
| .await(ready) | |
| function ready(error, map){ | |
| centerZoom(map); | |
| tiles(); | |
| drawSubUnits(map); | |
| } | |
| // This function "centers" and "zooms" a map by setting its projection's scale and translate according to its outer boundary | |
| // It also returns the boundary itself in case you want to draw it to the map | |
| function centerZoom(data){ | |
| var o = topojson.mesh(data, data.objects.polygons, function(a, b) { return a === b; }); | |
| projection | |
| .scale(1) | |
| .translate([0, 0]); | |
| var b = path.bounds(o), | |
| s = 1 / Math.max((b[1][0] - b[0][0]) / width, (b[1][1] - b[0][1]) / height), | |
| t = [(width - s * (b[1][0] + b[0][0])) / 2, (height - s * (b[1][1] + b[0][1])) / 2]; | |
| projection | |
| .scale(s) | |
| .translate(t); | |
| return o; | |
| } | |
| function drawSubUnits(data){ | |
| svg.selectAll(".subunit") | |
| .data(topojson.feature(data, data.objects.polygons).features) | |
| .enter().append("path") | |
| .attr("class", "subunit") | |
| .attr("d", path); | |
| } | |
| function tiles(){ | |
| var pi = Math.PI, | |
| tau = 2 * pi; | |
| 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); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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