Created
February 9, 2016 14:54
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Town/county switch with topojson
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| #map path { | |
| fill: #fff; | |
| stroke: #999; | |
| stroke-width; 1; | |
| } | |
| #map path.state.border { | |
| fill: none; | |
| stroke-width: 2; | |
| stroke: #333; | |
| } | |
| #map path.county.border { | |
| fill: none; | |
| stroke-width: 2; | |
| stroke: #666; | |
| } | |
| </style> | |
| <body> | |
| <div id="map"></div> | |
| </body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.20/topojson.js"></script> | |
| <script> | |
| d3.json("nh-towns.json", function(err, topo) { | |
| var margin = {top: 0, right: 0, bottom: 0, left: 0}, | |
| width = 500, | |
| height = 590, | |
| path = d3.geo.path().projection(null), | |
| svg = d3.select("#map").append("svg").attr({ | |
| width: width + margin.left + margin.right, | |
| height: height + margin.top + margin.bottom, | |
| }) | |
| g = svg.append("g").attr({ | |
| transform: "translate(" + margin.left + "," + margin.top + ")scale(.83)" | |
| }), | |
| town = g.selectAll("path.town") | |
| .data(topojson.feature(topo, topo.objects.counties).features) | |
| .enter().append("path") | |
| .attr({ | |
| "class": "town border", | |
| d: path | |
| }) | |
| .style({ | |
| opacity: 1 | |
| }), | |
| countyBorder = g.append("path") | |
| .datum(topojson.mesh(topo, topo.objects.counties, function(a, b) { | |
| return String("000" + a.properties.fips).slice(-6).slice(0, 3) !== String("000" + b.properties.fips).slice(-6).slice(0, 3); | |
| })) | |
| .attr({ | |
| "class": "county border", | |
| d: path | |
| }) | |
| .style({ | |
| opacity: 0 | |
| }) | |
| stateBorder = g.append("path") | |
| .datum(topojson.mesh(topo, topo.objects.counties, function(a, b) { | |
| return a === b; | |
| })) | |
| .attr({ | |
| "class": "state border", | |
| d: path | |
| }); | |
| var selected = "town"; | |
| function toggle() { | |
| town.transition() | |
| .duration(1000) | |
| .style({ | |
| opacity: selected === "town" ? .1 : 1 | |
| }); | |
| countyBorder.transition() | |
| .duration(1000) | |
| .style({ | |
| opacity: selected === "town" ? 1 : .1 | |
| }); | |
| selected = selected === "town" ? "county" : "town"; | |
| window.setTimeout(toggle, 1500); | |
| } | |
| toggle(); | |
| }); | |
| </script> |
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