A demo of the d3.geo.tile plugin, which determines which 256x256 tiles are visible in the viewport based on a scale and translate. This demo combines the tile plugin with d3.behavior.zoom for panning and zooming, resulting in a a simple slippy map. Based partly on an example by Tom MacWright.
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d3.geo.tile
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="https://raw.github.com/d3/d3-plugins/master/geo/tile/tile.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var tile = d3.geo.tile(); | |
| var zoom = d3.behavior.zoom() | |
| .scale(1024) | |
| .translate([width / 2, height / 2]) | |
| .on("zoom", zoomed); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .call(zoom); | |
| var g = svg.append("g"); | |
| zoomed(); | |
| function zoomed() { | |
| var tiles = tile | |
| .scale(zoom.scale()) | |
| .translate(zoom.translate()) | |
| (); | |
| var image = g | |
| .attr("transform", function(d) { return "scale(" + tiles.scale + ")translate(" + tiles.translate + ")"; }) | |
| .selectAll("image") | |
| .data(tiles, function(d) { return d; }); | |
| image.exit() | |
| .remove(); | |
| image.enter().append("image") | |
| .attr("xlink:href", function(d) { return "http://2.tiles.cartocdn.com/jatorre-beta/tiles/regions/" + d[2] + "/" + d[0] + "/" + d[1] + ".png?sql=SELECT%20*%20FROM%20regions&cache_buster=2012-11-22T12:37:07+01:00&cache_policy=persist&interactivity=cartodb_id%2Coriginal_c"; }) | |
| .attr("width", 1) | |
| .attr("height", 1) | |
| .attr("x", function(d) { return d[0]; }) | |
| .attr("y", function(d) { return d[1]; }); | |
| } | |
| </script> |
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