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D3 clipped map zoom
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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> | |
| <title>Mapnik - D3 Preview</title> | |
| <meta charset="utf-8" /> | |
| <meta http-equiv="X-UA-Compatible" content="IE=EDGE" /> | |
| <!-- Mobile meta tags--> | |
| <meta name="HandheldFriendly" content="True"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" /> | |
| <meta name="MobileOptimized" content="320"/> | |
| <meta http-equiv="cleartype" content="on"> | |
| <!-- Styles --> | |
| <link rel="stylesheet" href="includes-d3/css/style.css" /> | |
| <body> | |
| <svg></svg> | |
| </body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script src="includes-d3/js/lib/d3.geo.tile.min.js"></script> | |
| <script src="//d3js.org/topojson.v1.min.js"></script> | |
| <script src="includes-d3/js/script.js"></script> |
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| // Code borrowed heavily from: | |
| // http://bl.ocks.org/mbostock/4150951 | |
| // https://bl.ocks.org/mbostock/2374239 | |
| var width = 960, | |
| height = 900, | |
| scaleSize = 3000, | |
| features, | |
| districts, | |
| defs, | |
| tiles; | |
| // Tiles | |
| var projection = d3.geo.mercator() | |
| .scale(scaleSize) | |
| .center([-99.9, 31.9]) | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var tile = d3.geo.tile() | |
| .size([width, height]); | |
| // Zoom | |
| var tx_lat_long = [-99.9, 31.9]; | |
| var center = projection(tx_lat_long); | |
| var zoom = d3.behavior.zoom() | |
| .scaleExtent([1, 20]) | |
| .on("zoom", zoomInOut); | |
| // Map | |
| var svg = d3.select("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .call(zoom); | |
| // Transform the map when we zoom in, out | |
| function zoomInOut(state) { | |
| tiles = tile | |
| .scale(projection.scale() * 2 * Math.PI * zoom.scale()) | |
| .translate(projection([zoom.translate()[0], zoom.translate()[1]])) | |
| (); | |
| svg.select('.tiles-clip') | |
| // Move tiles | |
| tiles_clip = svg.select('.tiles-clip') | |
| .attr("clip-path", "url(#clip)") | |
| // .style(prefix + "transform", matrix3d(tiles.scale, tiles.translate)) | |
| .selectAll("image") | |
| .data(tiles); | |
| tiles_clip.exit().remove(); | |
| // Load tiles from URL | |
| tiles_clip.enter().append("image") | |
| .attr("xlink:href", function(d) { | |
| return "http://" + ["a", "b", "c", "d"][Math.random() * 4 | 0] + ".tiles.mapbox.com/v3/mapbox.natural-earth-2/" + d[2] + "/" + d[0] + "/" + d[1] + ".png"; | |
| }) | |
| .attr("width", Math.round(tiles.scale)) | |
| .attr("height", Math.round(tiles.scale)) | |
| .attr("x", function(d) { | |
| return Math.round((d[0] + tiles.translate[0]) * tiles.scale); | |
| }) | |
| .attr("y", function(d) { | |
| return Math.round((d[1] + tiles.translate[1]) * tiles.scale); | |
| }); | |
| tiles_clip.exit().remove() | |
| // Move boundaries | |
| if (state !== 'init') { | |
| features.attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")"); | |
| districts.style("stroke-width", 1.25 / d3.event.scale + "px"); | |
| features.select('.district-35').style("stroke-width", 4 / d3.event.scale + "px"); | |
| defs.select("path").attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")"); | |
| } | |
| // close zoominout | |
| } | |
| // Draw lines on map | |
| function drawMaps(file){ | |
| var topojson_path = 'topojson/' + file + '.topojson'; | |
| var districtObject = "Texas_US_House_Districts"; | |
| d3.json(topojson_path, function(error, data) { | |
| if (error) return console.error(error); | |
| defs = svg.append("defs"); | |
| var className = ".districts"; | |
| defs.append("path") | |
| .attr("id", "land") | |
| .datum(topojson.feature(data, data.objects[districtObject])) | |
| .attr("d", path); | |
| defs.append("clipPath") | |
| .attr("id", "clip") | |
| .append("use") | |
| .attr("xlink:href", "#land"); | |
| svg.append("use") | |
| .attr("xlink:href", "#land") | |
| .attr("class", "stroke"); | |
| svg.append("g") | |
| .attr('class', 'tiles-clip') | |
| features = svg.append("g"); | |
| districts = features.selectAll(className) | |
| .data(topojson.feature(data, data.objects[districtObject]).features); | |
| districts.enter() | |
| .append("path") | |
| .attr("class", function(d) { | |
| if (d.properties["DIST_NBR"] != undefined) { | |
| var dist_num = d.properties["DIST_NBR"] | |
| } else { | |
| var dist_num = d.properties["CD"] | |
| } | |
| return "district district-" + dist_num; | |
| }) | |
| .attr("d", path); | |
| districts.exit().remove(); | |
| zoomInOut('init'); | |
| // close d3 json | |
| }); | |
| // close draw maps | |
| } | |
| drawMaps('all-current'); | |
| //drawMaps('all-07-13'); |
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| body { | |
| margin: 0; | |
| padding: 0; | |
| } | |
| .county { | |
| stroke: none; | |
| stroke-width: 0.3; | |
| fill: none; | |
| } | |
| svg { | |
| fill: none; | |
| } | |
| svg text{ | |
| font-family: Arial; | |
| } | |
| .district{ | |
| stroke: hsl(200, 56%, 40%);; | |
| stroke-width: 1; | |
| } | |
| .district-35 { | |
| stroke: hsl(7, 77%, 54%);; | |
| stroke-width: 4; | |
| } |
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