This tweak to my original example uses a Mercator projection rather than Albers USA, which straightens out many of the state borders and puts Alaska and Hawaii in their right places.
Created
February 27, 2014 21:14
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Geo thumbnails (Mercator)
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<!DOCTYPE html> | |
<html> | |
<head> | |
<title>d3 geo thumbnails</title> | |
<script src="http://d3js.org/d3.v3.min.js"></script> | |
<script src="http://d3js.org/topojson.v1.min.js"></script> | |
<style> | |
svg.thumb { | |
width: 90px; | |
height: 94px; | |
display: block; | |
float: left; | |
margin: 5px 0 0 5px; | |
} | |
path { | |
vector-effect: non-scaling-stroke; | |
stroke-width: 1; | |
} | |
.thumb .bg, | |
.thumb use { | |
fill: #ddd; | |
stroke: #ccc; | |
} | |
.thumb .fg { | |
fill: #8cba3d; | |
stroke: none; | |
} | |
</style> | |
</head> | |
<body> | |
<div id="thumbnails"></div> | |
<svg id="shared"> | |
</svg> | |
<script> | |
var root = d3.select("#thumbnails"), | |
proj = d3.geo.mercator() | |
.center([-98, 38]), | |
path = d3.geo.path() | |
.projection(proj), | |
// how much space to give the features from | |
// the edge of their container | |
margin = 10; | |
d3.json("us-states.json", function(error, topology) { | |
var collection = topojson.feature(topology, topology.objects["states"]); | |
// draw the whole collection once to a path in the shared <defs> | |
d3.select("#shared") | |
.append("defs") | |
.append("path") | |
.datum(collection) | |
.attr("id", "states-bg") | |
.attr("d", path); | |
// sort the states by name | |
collection.features.sort(function(a, b) { | |
return d3.ascending(a.properties.name, b.properties.name); | |
}); | |
// filter out the territories & DC | |
var states = collection.features.filter(function(d) { | |
return +d.id <= 70 && d.id != 11; | |
}); | |
var svg = root.selectAll(".thumb") | |
.data(states) | |
.enter() | |
.append("svg") | |
.attr("id", function(d) { | |
return d.properties.name; | |
}) | |
.attr("class", "thumb") | |
.attr("viewBox", function(d) { | |
// get the projected bounds | |
var bounds = path.bounds(d), | |
width = bounds[1][0] - bounds[0][0], | |
height = bounds[1][1] - bounds[0][1], | |
// get the proportion of the bounds' longest side | |
// to the container's shortest side | |
scale = Math.max(width, height) / Math.min(this.offsetWidth, this.offsetHeight), | |
// and multiply the desired margin by this | |
m = margin * scale; | |
return [ | |
bounds[0][0] - m, | |
bounds[0][1] - m, | |
width + m * 2, | |
height + m * 2 | |
].join(" "); | |
}); | |
// place the shared states path here | |
svg.append("use") | |
.attr("xlink:href", "#states-bg"); | |
// and draw the individual states on top | |
svg.append("path") | |
.attr("class", "fg") | |
.attr("d", path); | |
}); | |
</script> | |
</body> | |
</html> |
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