In response to a Stack Overflow question regarding TopoJSON for congressional districts.
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113th U.S. Congressional Districts
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| license: gpl-3.0 |
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.
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| path { | |
| stroke-linejoin: round; | |
| stroke-linecap: round; | |
| } | |
| .districts { | |
| fill: #bbb; | |
| } | |
| .districts :hover { | |
| fill: orange; | |
| } | |
| .district-boundaries { | |
| pointer-events: none; | |
| fill: none; | |
| stroke: #fff; | |
| stroke-width: .5px; | |
| } | |
| .state-boundaries { | |
| pointer-events: none; | |
| fill: none; | |
| stroke: #fff; | |
| stroke-width: 1.5px; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script src="//d3js.org/queue.v1.min.js"></script> | |
| <script src="//d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 600; | |
| var projection = d3.geo.albersUsa() | |
| .scale(1280) | |
| .translate([width / 2, height / 2]); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| queue() | |
| .defer(d3.json, "/mbostock/raw/4090846/us.json") | |
| .defer(d3.json, "/mbostock/raw/4090846/us-congress-113.json") | |
| .await(ready); | |
| function ready(error, us, congress) { | |
| if (error) throw error; | |
| svg.append("defs").append("path") | |
| .attr("id", "land") | |
| .datum(topojson.feature(us, us.objects.land)) | |
| .attr("d", path); | |
| svg.append("clipPath") | |
| .attr("id", "clip-land") | |
| .append("use") | |
| .attr("xlink:href", "#land"); | |
| svg.append("g") | |
| .attr("class", "districts") | |
| .attr("clip-path", "url(#clip-land)") | |
| .selectAll("path") | |
| .data(topojson.feature(congress, congress.objects.districts).features) | |
| .enter().append("path") | |
| .attr("d", path) | |
| .append("title") | |
| .text(function(d) { return d.id; }); | |
| svg.append("path") | |
| .attr("class", "district-boundaries") | |
| .datum(topojson.mesh(congress, congress.objects.districts, function(a, b) { return a !== b && (a.id / 1000 | 0) === (b.id / 1000 | 0); })) | |
| .attr("d", path); | |
| svg.append("path") | |
| .attr("class", "state-boundaries") | |
| .datum(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; })) | |
| .attr("d", path); | |
| } | |
| d3.select(self.frameElement).style("height", height + "px"); | |
| </script> |
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