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Maps with TopoJSON, Leaflet & Chroma.js http://blog.webkid.io
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Maps with Leaflet,TopoJSON & Chroma.js</title> | |
| <link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.css" /> | |
| <style> | |
| *{ | |
| margin:0; | |
| padding:0; | |
| -webkit-box-sizing:border-box; | |
| -moz-box-sizing:border-box; | |
| box-sizing:border-box; | |
| } | |
| body,html,#worldmap{ | |
| height:100%; | |
| } | |
| body{ | |
| color:#333; | |
| font-family:sans-serif; | |
| } | |
| #worldmap{ | |
| background:white; | |
| } | |
| .country-name{ | |
| position: absolute; | |
| top:2em; | |
| right:1em; | |
| z-index:6; | |
| background:rgba(0,0,0,.75); | |
| color:white; | |
| padding:.5em .75em; | |
| font-size:.85em; | |
| display:none; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="worldmap"></div> | |
| <div class="country-name"></div> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/chroma-js/1.3.6/chroma.min.js"></script> | |
| <script src="https://code.jquery.com/jquery-2.1.1.min.js"></script> | |
| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| <script src="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js"></script> | |
| <script> | |
| // Copyright (c) 2013 Ryan Clark | |
| // https://gist.github.com/rclark/5779673 | |
| L.TopoJSON = L.GeoJSON.extend({ | |
| addData: function(jsonData) { | |
| if (jsonData.type === "Topology") { | |
| for (key in jsonData.objects) { | |
| geojson = topojson.feature(jsonData, jsonData.objects[key]); | |
| L.GeoJSON.prototype.addData.call(this, geojson); | |
| } | |
| } | |
| else { | |
| L.GeoJSON.prototype.addData.call(this, jsonData); | |
| } | |
| } | |
| }); | |
| </script> | |
| <script> | |
| (function(){ | |
| 'use strict' | |
| var map = L.map('worldmap',{maxZoom:10,minZoom:3}), | |
| topoLayer = new L.TopoJSON(), | |
| $countryName = $('.country-name'), | |
| colorScale = chroma | |
| .scale(['#D5E3FF', '#003171']) | |
| .domain([0,1]); | |
| map.setView([44,-31], 3); | |
| $.getJSON('data/countries.topo.json').done(addTopoData); | |
| function addTopoData(topoData){ | |
| topoLayer.addData(topoData); | |
| topoLayer.addTo(map); | |
| topoLayer.eachLayer(handleLayer); | |
| } | |
| function handleLayer(layer){ | |
| var randomValue = Math.random(), | |
| fillColor = colorScale(randomValue).hex(); | |
| layer.setStyle({ | |
| fillColor : fillColor, | |
| fillOpacity: 1, | |
| color:'#555', | |
| weight:1, | |
| opacity:.5 | |
| }); | |
| layer.on({ | |
| mouseover : enterLayer, | |
| mouseout: leaveLayer | |
| }); | |
| } | |
| function enterLayer(){ | |
| var countryName = this.feature.properties.name; | |
| $countryName.text(countryName).show(); | |
| this.bringToFront(); | |
| this.setStyle({ | |
| weight:2, | |
| opacity: 1 | |
| }); | |
| } | |
| function leaveLayer(){ | |
| $countryName.hide(); | |
| this.bringToBack(); | |
| this.setStyle({ | |
| weight:1, | |
| opacity:.5 | |
| }); | |
| } | |
| }()); | |
| </script> | |
| </body> | |
| </html> |
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