Make with make topo/va-counties.json in the U.S. Atlas project.
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .state { | |
| fill: #ccc; | |
| } | |
| .county-border { | |
| fill: none; | |
| stroke: #fff; | |
| stroke-width: 1.01px; | |
| stroke-linejoin: round; | |
| stroke-linecap: round; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/d3.geo.projection.v0.min.js"></script> | |
| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var projection = d3.geo.conicConformal() | |
| .parallels([38 + 02 / 60, 39 + 12 / 60]) | |
| .rotate([78 + 30 / 60, 0]) | |
| .scale(8000) | |
| .translate([0, 0]); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| d3.json("va-counties.json", function(error, topo) { | |
| var state = topojson.feature(topo, topo.objects.states), | |
| bounds = path.bounds(state); | |
| projection | |
| .translate([width / 2 - (bounds[0][0] + bounds[1][0]) / 2, height / 2 - (bounds[0][1] + bounds[1][1]) / 2]); | |
| svg.append("path") | |
| .datum(state) | |
| .attr("class", "state") | |
| .attr("d", path); | |
| svg.append("path") | |
| .datum(topojson.mesh(topo, topo.objects.counties, function(a, b) { return a !== b; })) | |
| .attr("class", "county-border") | |
| .attr("d", path); | |
| }); | |
| </script> |
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