Last active
April 3, 2020 06:17
-
-
Save moklick/c1cc83e18a6fafd9af81 to your computer and use it in GitHub Desktop.
Maps with TopoJSON, Leaflet & Chroma.js http://blog.webkid.io
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!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="//cdnjs.cloudflare.com/ajax/libs/chroma-js/0.5.9/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> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment