A basic starter for UCB students who want to make a choropleth map. Nearly identical to Mike Bostock's many examples with counties.
Created
November 19, 2013 04:54
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basic state choropleth starter
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style type="text/css"> | |
| body { | |
| font-family: arial; | |
| width:950px; | |
| margin:20px auto; | |
| } | |
| .states-lines { | |
| stroke: #fff; | |
| stroke-width: 2px; | |
| fill: none; | |
| } | |
| .states-fill { | |
| /*fill:#f0f0f0;*/ | |
| } | |
| </style> | |
| <body> | |
| <h4>Choropleth map of states</h4> | |
| <div class="g-map"></div> | |
| </body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/queue.v1.min.js"></script> | |
| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var color = d3.scale.threshold() | |
| .domain([.02, .04, .06, .08, .10]) | |
| .range(["#f2f0f7", "#dadaeb", "#bcbddc", "#9e9ac8", "#756bb1", "#54278f"]); | |
| var path = d3.geo.path(); | |
| var svg = d3.select(".g-map").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| queue() | |
| .defer(d3.json, "us.json") | |
| .await(ready) | |
| function ready(err, us) { | |
| window.us = us; | |
| svg.append("g") | |
| .attr("class", "states") | |
| .selectAll("path") | |
| .data(topojson.feature(us, us.objects.states).features) | |
| .enter().append("path") | |
| .attr("d", path) | |
| .style("fill", "#ccc"); | |
| svg.append("path") | |
| .datum(topojson.mesh(us, us.objects.states, function(a, b) { return a.id !== b.id; })) | |
| .attr("class", "states-lines") | |
| .attr("d", path); | |
| } | |
| </script> |
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