A test for wrapping using the d3.geo.tile plugin.
Based on Mike Bostock’s example.
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Wrapped d3.geo.tile
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| margin: 0; | |
| } | |
| .map { | |
| position: relative; | |
| overflow: hidden; | |
| } | |
| .layer { | |
| position: absolute; | |
| } | |
| .tile { | |
| pointer-events: none; | |
| position: absolute; | |
| width: 256px; | |
| height: 256px; | |
| } | |
| .info { | |
| position: absolute; | |
| bottom: 10px; | |
| left: 10px; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="tile.js"></script> | |
| <script> | |
| var width = Math.max(960, window.innerWidth), | |
| height = Math.max(500, window.innerHeight), | |
| prefix = prefixMatch(["webkit", "ms", "Moz", "O"]); | |
| var tile = d3.geo.tile() | |
| .size([width, height]) | |
| .overflow([true, false]); | |
| var projection = d3.geo.mercator(); | |
| var zoom = d3.behavior.zoom() | |
| .scale(1 << 8) | |
| .scaleExtent([1 << 8, 1 << 23]) | |
| .translate([width / 2, height / 2]) | |
| .on("zoom", zoomed); | |
| var map = d3.select("body").append("div") | |
| .attr("class", "map") | |
| .style("width", width + "px") | |
| .style("height", height + "px") | |
| .call(zoom) | |
| .on("mousemove", mousemoved); | |
| var layer = map.append("div") | |
| .attr("class", "layer"); | |
| var info = map.append("div") | |
| .attr("class", "info"); | |
| zoomed(); | |
| function zoomed() { | |
| var tiles = tile | |
| .scale(zoom.scale()) | |
| .translate(zoom.translate()) | |
| (); | |
| projection | |
| .scale(zoom.scale() / 2 / Math.PI) | |
| .translate(zoom.translate()); | |
| var image = layer | |
| .style(prefix + "transform", matrix3d(tiles.scale, tiles.translate)) | |
| .selectAll(".tile") | |
| .data(tiles, function(d) { return d; }); | |
| image.exit() | |
| .remove(); | |
| image.enter().append("img") | |
| .attr("class", "tile") | |
| .attr("src", function(d) { | |
| var z = d[2], | |
| k = 1 << z, | |
| x = (d[0] % k + k) % k, | |
| y = d[1]; | |
| return "http://" + ["a", "b", "c", "d"][Math.random() * 4 | 0] + ".tiles.mapbox.com/v3/examples.map-i86nkdio/" + z + "/" + x + "/" + y + ".png"; | |
| }) | |
| .style("left", function(d) { return (d[0] << 8) + "px"; }) | |
| .style("top", function(d) { return (d[1] << 8) + "px"; }); | |
| } | |
| function mousemoved() { | |
| info.text(formatLocation(projection.invert(d3.mouse(this)), zoom.scale())); | |
| } | |
| function matrix3d(scale, translate) { | |
| var k = scale / 256, r = scale % 1 ? Number : Math.round; | |
| return "matrix3d(" + [k, 0, 0, 0, 0, k, 0, 0, 0, 0, k, 0, r(translate[0] * scale), r(translate[1] * scale), 0, 1 ] + ")"; | |
| } | |
| function prefixMatch(p) { | |
| var i = -1, n = p.length, s = document.body.style; | |
| while (++i < n) if (p[i] + "Transform" in s) return "-" + p[i].toLowerCase() + "-"; | |
| return ""; | |
| } | |
| function formatLocation(p, k) { | |
| var format = d3.format("." + Math.floor(Math.log(k) / 2 - 2) + "f"); | |
| return (p[1] < 0 ? format(-p[1]) + "°S" : format(p[1]) + "°N") + " " | |
| + (p[0] < 0 ? format(-p[0]) + "°W" : format(p[0]) + "°E"); | |
| } | |
| </script> |
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| d3.geo.tile = function() { | |
| var size = [960, 500], | |
| scale = 256, | |
| translate = [size[0] / 2, size[1] / 2], | |
| zoomDelta = 0, | |
| clampX = clamp, | |
| clampY = clamp; | |
| function tile() { | |
| var z = Math.max(Math.log(scale) / Math.LN2 - 8, 0), | |
| z0 = Math.round(z + zoomDelta), | |
| k = Math.pow(2, z - z0 + 8), | |
| origin = [(translate[0] - scale / 2) / k, (translate[1] - scale / 2) / k], | |
| tiles = [], | |
| w = 1 << z0, | |
| x0 = clampX(Math.floor(-origin[0]), w), | |
| y0 = clampY(Math.floor(-origin[1]), w), | |
| x1 = clampX(Math.ceil(size[0] / k - origin[0]), w), | |
| y1 = clampY(Math.ceil(size[1] / k - origin[1]), w); | |
| for (var y = y0; y < y1; ++y) { | |
| for (var x = x0; x < x1; ++x) { | |
| tiles.push([x, y, z0]); | |
| } | |
| } | |
| tiles.translate = origin; | |
| tiles.scale = k; | |
| return tiles; | |
| } | |
| tile.size = function(_) { | |
| if (!arguments.length) return size; | |
| size = _; | |
| return tile; | |
| }; | |
| tile.scale = function(_) { | |
| if (!arguments.length) return scale; | |
| scale = _; | |
| return tile; | |
| }; | |
| tile.translate = function(_) { | |
| if (!arguments.length) return translate; | |
| translate = _; | |
| return tile; | |
| }; | |
| tile.zoomDelta = function(_) { | |
| if (!arguments.length) return zoomDelta; | |
| zoomDelta = +_; | |
| return tile; | |
| }; | |
| tile.overflow = function(_) { | |
| if (!arguments.length) return [clampX === identity, clampY === identity]; | |
| clampX = _[0] ? identity : clamp; | |
| clampY = _[1] ? identity : clamp; | |
| return tile; | |
| }; | |
| return tile; | |
| function identity(x) { return x; } | |
| function clamp(x, max) { return Math.max(0, Math.min(max, x)); } | |
| }; |
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