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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .counties { | |
| fill: none; | |
| stroke: black; | |
| opacity:0.2; | |
| } | |
| .states { | |
| fill: none; | |
| stroke: black; | |
| stroke-linejoin: round; | |
| } | |
| .make-it-red { | |
| fill: red; | |
| stroke: yellow; | |
| stroke-width: 2px; | |
| } | |
| </style> | |
| <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 maptype = 'topojson'; | |
| 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, "us-states.geojson") | |
| .defer(d3.json, "us-states.topojson") | |
| .await(ready); | |
| function ready(error, us_geojson,us_topojson) { | |
| // GEOJSON | |
| if (maptype === 'geojson') { | |
| var us = us_geojson; | |
| svg.append("g") | |
| .attr("class", "states") | |
| .selectAll("path") | |
| .data(us.features) | |
| .enter().append("path") | |
| .attr("d", path) | |
| // the three commented lines below are a longer version of the line above | |
| /* | |
| .attr("d", function(d) { | |
| return path(d); | |
| }) | |
| */ | |
| .classed('make-it-red', function(d) { | |
| if (d.properties.name === "Mississippi" || d.properties.name === "Oregon") { | |
| return true; | |
| } | |
| else { | |
| return false; | |
| } | |
| }) | |
| } | |
| // TOPOJSON | |
| else if (maptype === 'topojson') { | |
| var us = us_topojson; | |
| svg.append("g") | |
| .attr("class", "counties") | |
| .selectAll("path") | |
| .data(topojson.feature(us, us.objects.counties).features) | |
| .enter().append("path") | |
| .attr("d", path); | |
| svg.append("path") | |
| .datum(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; })) | |
| .attr("class", "states") | |
| .attr("d", path); | |
| } | |
| } | |
| </script> |
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