This example uses d3.geo.bounds to draw the lat-lon bounding box for each county. Compare to the projected bounding box using path.bounds.
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Blocky Counties
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| path { | |
| fill: none; | |
| stroke: steelblue; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script src="//d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var projection = d3.geo.albersUsa() | |
| .scale(1000) | |
| .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); | |
| d3.json("/mbostock/raw/4090846/us.json", function(error, us) { | |
| if (error) throw error; | |
| svg.append("path") | |
| .attr("d", path({ | |
| type: "MultiPolygon", | |
| coordinates: topojson.feature(us, us.objects.counties).features | |
| .filter(function(d) { return d.geometry && d.geometry.coordinates.length; }) | |
| .map(function(d) { var b = d3.geo.bounds(d); return [[b[0], [b[0][0], b[1][1]], b[1], [b[1][0], b[0][1]], b[0]]]; }) | |
| })); | |
| }); | |
| </script> |
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