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TopoJSON to LeafletJS Using D3.js
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| <html> | |
| <head> | |
| <title>HTML5</title> | |
| <!--D3 code stolen from: http://bost.ocks.org/mike/leaflet/#init--> | |
| <!--This file used in blog post Spatial data on a diet: tips | |
| for file size reduction using TopoJSON (http://bit.ly/1jvHiqF)--> | |
| <meta charset="utf-8" /> | |
| <meta name="viewport" content="width=650, user-scalable=yes"> | |
| <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script> | |
| <link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.7.2/leaflet.css" /> | |
| <script src="http://cdn.leafletjs.com/leaflet-0.7.2/leaflet.js"></script> | |
| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
| <style> | |
| path { | |
| fill: #000; | |
| fill-opacity: .2; | |
| stroke: #003399; | |
| stroke-width: 1.5px; | |
| } | |
| path:hover { | |
| fill: brown; | |
| fill-opacity: .7; | |
| } | |
| html, body { | |
| height: 100%; | |
| margin: 0; | |
| } | |
| #mapcanvas{ | |
| height:100%; | |
| } | |
| </style> | |
| <script> | |
| //d3 code stolen from http://bost.ocks.org/mike/leaflet/#init | |
| var geoJsonObject; | |
| $(document).ready(function(){ | |
| map = new L.Map('mapcanvas'); | |
| var osmUrl='http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png'; | |
| var osmAttrib='Map data © <a href="http://openstreetmap.org">OpenStreetMap</a> contributors'; | |
| var osm = new L.TileLayer(osmUrl, {attribution: osmAttrib}); | |
| map.setView(new L.LatLng(36.788283, -119.805891),6); | |
| map.addLayer(osm); | |
| var svg = d3.select(map.getPanes().overlayPane).append("svg"), | |
| g = svg.append("g").attr("class", "leaflet-zoom-hide"); | |
| d3.json("township.json", function(collection) { | |
| collection = topojson.feature(collection, collection.objects.township) | |
| var transform = d3.geo.transform({point: projectPoint}), | |
| path = d3.geo.path().projection(transform); | |
| var feature = g.selectAll("path") | |
| .data(collection.features) | |
| .enter().append("path"); | |
| //d3 code stolen from http://bost.ocks.org/mike/leaflet/#init | |
| map.on("viewreset", reset); | |
| reset(); | |
| function reset() { | |
| var bounds = path.bounds(collection), | |
| topLeft = bounds[0], | |
| bottomRight = bounds[1]; | |
| svg .attr("width", bottomRight[0] - topLeft[0]) | |
| .attr("height", bottomRight[1] - topLeft[1]) | |
| .style("left", topLeft[0] + "px") | |
| .style("top", topLeft[1] + "px"); | |
| g .attr("transform", "translate(" + -topLeft[0] + "," + -topLeft[1] + ")"); | |
| feature.attr("d", path); | |
| } | |
| function projectPoint(x, y) { | |
| var point = map.latLngToLayerPoint(new L.LatLng(y, x)); | |
| this.stream.point(point.x, point.y); | |
| } | |
| }); | |
| });//end document ready | |
| </script> | |
| </head> | |
| <body> | |
| <div id="mapcanvas"> | |
| </div> | |
| </body> | |
| </html> |
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