Created
May 3, 2012 12:08
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D3 Dorling cartogram with rectangular states
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"> | |
<title>Dorling Cartogram</title> | |
<script type="text/javascript" src="http://mbostock.github.com/d3/d3.v2.js"></script> | |
<style> | |
#chart { | |
width: 960px; | |
height: 470px; | |
} | |
circle { | |
stroke: #000; | |
stroke-width: .5px; | |
} | |
</style> | |
</head> | |
<body> | |
<div id="chart"></div> | |
<button id="restart" onclick="force.start()">Reheat</button> | |
<button id="update" onclick="update()">Renew</button> | |
<script> | |
var force = d3.layout.force() | |
.charge(0) | |
.gravity(0) | |
.size([960, 470]); | |
var update; | |
d3.json("us-state-centroids.json", function(states) { | |
var project = d3.geo.albersUsa(), | |
idToNode = {}, | |
links = []; | |
update = function() { | |
d3.select("svg").remove(); | |
var svg = d3.select("#chart").append("svg") | |
.attr("width", 960) | |
.attr("height", 470) | |
.append("g") | |
.attr("transform", "translate(50,20)"); | |
var nodes = states.features.map(function(d) { | |
var xy = project(d.geometry.coordinates); | |
return idToNode[d.id] = { | |
x: xy[0], | |
y: xy[1], | |
gravity: {x: xy[0], y: xy[1]}, | |
width: Math.random()*100+25, | |
height: Math.random()*100+25 | |
}; | |
}); | |
var overlapColor = d3.scale.linear() | |
.domain([0, 7]) | |
.range(["#2070a0", "orange"]) | |
//nodes = nodes.slice(0, 50) | |
force | |
.nodes(nodes) | |
.links(links) | |
.start() | |
.on("tick", function(e) { | |
var k = e.alpha, | |
kg = k * .02, | |
spaceAround = 0.; | |
nodes.forEach(function(a, i) { | |
// Apply gravity forces. | |
a.x += (a.gravity.x - a.x) * kg; | |
a.y += (a.gravity.y - a.y) * kg; | |
a.overlapCount = 0; | |
nodes.slice(i + 1).forEach(function(b) { | |
/* | |
// Check for collisions. | |
var dx = a.x - b.x, | |
dy = a.y - b.y, | |
l = Math.sqrt(dx * dx + dy * dy), | |
d = a.r + b.r; | |
if (l < d) { | |
l = (l - d) / l * k; | |
dx *= l; | |
dy *= l; | |
a.x -= dx; | |
a.y -= dy; | |
b.x += dx; | |
b.y += dy; | |
} | |
*/ | |
dx = (a.x - b.x) | |
dy = (a.y - b.y) | |
adx = Math.abs(dx) | |
ady = Math.abs(dy) | |
mdx = (1+spaceAround)* (a.width + b.width)/2 | |
mdy = (1+spaceAround)* (a.height + b.height)/2 | |
if (adx < mdx && ady < mdy) { | |
l = Math.sqrt(dx * dx + dy * dy) | |
lx = (adx - mdx) / l * k | |
ly = (ady - mdy) / l * k | |
// choose the direction with less overlap | |
if (lx > ly && ly > 0) lx = 0; | |
else if (ly > lx && lx > 0) ly = 0; | |
dx *= lx | |
dy *= ly | |
a.x -= dx | |
a.y -= dy | |
b.x += dx | |
b.y += dy | |
a.overlapCount++; | |
} | |
}); | |
}); | |
svg.selectAll("rect") | |
.style("fill", function(d) { return overlapColor(d.overlapCount); }) | |
.attr("x", function(d) { return d.x- d.width/2; }) | |
.attr("y", function(d) { return d.y- d.height/2; }); | |
svg.selectAll("line") | |
.attr("x2", function(d) { return d.x; }) | |
.attr("y2", function(d) { return d.y; }) | |
svg.selectAll("circle.end") | |
.attr("cx", function(d) { return d.x; }) | |
.attr("cy", function(d) { return d.y; }) | |
}); | |
var g = svg.selectAll("g") | |
.data(nodes) | |
.enter() | |
.append("g") | |
.attr("transform", "translate(100,100),scale(0.5)") | |
g.append("circle") | |
.attr("stroke", "#000") | |
.attr("fill", "#fff") | |
.attr("cx", function(d) { return d.gravity.x; }) | |
.attr("cy", function(d) { return d.gravity.y; }) | |
.attr("r", 3) | |
g.append("line") | |
.attr("stroke", "#000") | |
.attr("opacity", "0.3") | |
.attr("x1", function(d) { return d.gravity.x; }) | |
.attr("y1", function(d) { return d.gravity.y; }) | |
g.append("rect") | |
.attr("opacity", 0.75) | |
.attr("x", function(d) { return d.x - d.width/2; }) | |
.attr("y", function(d) { return d.y - d.height/2; }) | |
.attr("width", function(d, i) { return d.width; }) | |
.attr("height", function(d, i) { return d.height; }) | |
g.append("circle") | |
.attr("class", "end") | |
.attr("stroke", "#000") | |
.attr("fill", "#fff") | |
.attr("r", 3) | |
g.append("circle") | |
}; | |
update(); | |
}); | |
</script> | |
</body> | |
</html> |
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Came across this map, during my research, this appear to be Demers not Dorling cartogram.