A variation of merging polygons, this time using careful rendering rather than topological manipulation.
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February 9, 2016 02:06
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Merging States II
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license: gpl-3.0 |
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
.state { | |
fill: #ccc; | |
} | |
.state-boundary { | |
fill: none; | |
stroke: #fff; | |
} | |
.state.selected { | |
fill: orange; | |
} | |
.state.selected-boundary { | |
fill: none; | |
stroke: #000; | |
stroke-width: 2px; | |
} | |
</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); | |
var selected = { | |
"9": 1, "10": 1, "12": 1, "13": 1, "19": 1, "17": 1, "18": 1, "21": 1, | |
"25": 1, "24": 1, "23": 1, "26": 1, "29": 1, "37": 1, "31": 1, "33": 1, | |
"34": 1, "36": 1, "39": 1, "42": 1, "44": 1, "45": 1, "47": 1, "51": 1, | |
"50": 1, "55": 1, "54": 1 | |
}; | |
d3.json("/mbostock/raw/4090846/us.json", function(error, us) { | |
if (error) throw error; | |
var states = topojson.feature(us, us.objects.states), | |
selection = {type: "FeatureCollection", features: states.features.filter(function(d) { return d.id in selected; })}; | |
svg.append("path") | |
.datum(states) | |
.attr("class", "state") | |
.attr("d", path); | |
svg.append("path") | |
.datum(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; })) | |
.attr("class", "state-boundary") | |
.attr("d", path); | |
svg.append("path") | |
.datum(selection) | |
.attr("class", "state selected-boundary") | |
.attr("d", path); | |
svg.append("path") | |
.datum(selection) | |
.attr("class", "state selected") | |
.attr("d", path); | |
}); | |
</script> |
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