This is not a true Dorling cartogram; it lacks links between adjacent features. Instead of trying to preserve connectedness, this pseudo-cartogram tries to preserve locality, putting each circle as close as possible to its origin without overlapping.
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<title>Dorling Cartogram</title> | |
<style> | |
circle { | |
fill: #eee; | |
stroke: #000; | |
stroke-width: 1.5px; | |
} | |
</style> | |
<body> | |
<script src="http://d3js.org/d3.v3.min.js"></script> | |
<script> | |
// Ratio of Obese (BMI >= 30) in U.S. Adults, CDC 2008 | |
var valueById = [ | |
NaN, .187, .198, NaN, .133, .175, .151, NaN, .100, .125, | |
.171, NaN, .172, .133, NaN, .108, .142, .167, .201, .175, | |
.159, .169, .177, .141, .163, .117, .182, .153, .195, .189, | |
.134, .163, .133, .151, .145, .130, .139, .169, .164, .175, | |
.135, .152, .169, NaN, .132, .167, .139, .184, .159, .140, | |
.146, .157, NaN, .139, .183, .160, .143 | |
]; | |
var margin = {top: 0, right: 0, bottom: 0, left: 0}, | |
width = 960 - margin.left - margin.right, | |
height = 500 - margin.top - margin.bottom, | |
padding = 3; | |
var projection = d3.geo.albersUsa(); | |
var radius = d3.scale.sqrt() | |
.domain([0, d3.max(valueById)]) | |
.range([0, 30]); | |
var force = d3.layout.force() | |
.charge(0) | |
.gravity(0) | |
.size([width, height]); | |
var svg = d3.select("body").append("svg") | |
.attr("width", width + margin.left + margin.right) | |
.attr("height", height + margin.top + margin.bottom) | |
.append("g") | |
.attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
d3.json("/mbostock/raw/3750900/us-state-centroids.json", function(error, states) { | |
var nodes = states.features | |
.filter(function(d) { return !isNaN(valueById[+d.id]); }) | |
.map(function(d) { | |
var point = projection(d.geometry.coordinates), | |
value = valueById[+d.id]; | |
if (isNaN(value)) fail(); | |
return { | |
x: point[0], y: point[1], | |
x0: point[0], y0: point[1], | |
r: radius(value), | |
value: value | |
}; | |
}); | |
force | |
.nodes(nodes) | |
.on("tick", tick) | |
.start(); | |
var node = svg.selectAll("circle") | |
.data(nodes) | |
.enter().append("circle") | |
.attr("r", function(d) { return d.r; }); | |
function tick(e) { | |
node.each(gravity(e.alpha * .1)) | |
.each(collide(.5)) | |
.attr("cx", function(d) { return d.x; }) | |
.attr("cy", function(d) { return d.y; }); | |
} | |
function gravity(k) { | |
return function(d) { | |
d.x += (d.x0 - d.x) * k; | |
d.y += (d.y0 - d.y) * k; | |
}; | |
} | |
function collide(k) { | |
var q = d3.geom.quadtree(nodes); | |
return function(node) { | |
var nr = node.r + padding, | |
nx1 = node.x - nr, | |
nx2 = node.x + nr, | |
ny1 = node.y - nr, | |
ny2 = node.y + nr; | |
q.visit(function(quad, x1, y1, x2, y2) { | |
if (quad.point && (quad.point !== node)) { | |
var x = node.x - quad.point.x, | |
y = node.y - quad.point.y, | |
l = x * x + y * y, | |
r = nr + quad.point.r; | |
if (l < r * r) { | |
l = ((l = Math.sqrt(l)) - r) / l * k; | |
node.x -= x *= l; | |
node.y -= y *= l; | |
quad.point.x += x; | |
quad.point.y += y; | |
} | |
} | |
return x1 > nx2 || x2 < nx1 || y1 > ny2 || y2 < ny1; | |
}); | |
}; | |
} | |
}); | |
</script> |
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