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| <html> | |
| <head> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://d3js.org/d3-tile.v0.0.min.js"></script> | |
| <script src="https://unpkg.com/topojson@3"></script> | |
| </head> | |
| <body> | |
| <div id="mapplaceholder"></div> | |
| <script> | |
| var map; | |
| var width = 800, | |
| height = 600; | |
| var pi = Math.PI, | |
| tau = 2 * pi; | |
| var projection = d3.geoMercator() | |
| .scale(1 / tau) | |
| .translate([0, 0]); | |
| var path = d3.geoPath() | |
| .projection(projection); | |
| map = d3.select("#mapplaceholder") | |
| .append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var tile = d3.tile() | |
| .size([width, height]); | |
| var zoom = d3.zoom() | |
| .scaleExtent([1 << 15, 1 << 30]) | |
| .on("zoom", zoomed); | |
| var raster = map.append("g"); | |
| var vector; | |
| d3.json('data.json', function (error, data) { | |
| if (error) throw error; | |
| var topo = topojson.topology({foo: data}); | |
| vector = map.selectAll("path") | |
| .data(topojson.feature(topo, topo.objects.foo).features) | |
| .enter() | |
| .append("path"); | |
| var center = projection([36.8, -2.3]); | |
| map | |
| .call(zoom) | |
| .call(zoom.transform, d3.zoomIdentity | |
| .translate(width / 2, height / 2) | |
| .scale(1 << 19) | |
| .translate(-center[0], -center[1])); | |
| }); | |
| function zoomed(){ | |
| var transform = d3.event.transform; | |
| var tiles = tile | |
| .scale(transform.k) | |
| .translate([transform.x, transform.y]) | |
| (); | |
| projection | |
| .scale(transform.k / tau) | |
| .translate([transform.x, transform.y]); | |
| vector | |
| .attr("d", path); | |
| var image = raster | |
| .attr("transform", stringify(tiles.scale, tiles.translate)) | |
| .selectAll("image") | |
| .data(tiles, function(d) { return d; }); | |
| image.exit().remove(); | |
| image.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] * 256; }) | |
| .attr("y", function(d) { return d[1] * 256; }) | |
| .attr("width", 256) | |
| .attr("height", 256); | |
| } | |
| function stringify(scale, translate) { | |
| var k = scale / 256, r = scale % 1 ? Number : Math.round; | |
| return "translate(" + r(translate[0] * scale) + "," + r(translate[1] * scale) + ") scale(" + k + ")"; | |
| } | |
| </script> | |
| </body> | |
| </html> |
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