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January 4, 2016 21:29
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<!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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