robfaraj-snippets/dorling.js

## dorling.js
// Ratio of Obese (BMI >= 30) in U.S. Adults, CDC 2008
var data = [
  , .187, .198, , .133, .175, .151, , .1, .125, .171, , .172, .133, , .108,
  .142, .167, .201, .175, .159, .169, .177, .141, .163, .117, .182, .153, .195,
  .189, .134, .163, .133, .151, .145, .13, .139, .169, .164, .175, .135, .152,
  .169, , .132, .167, .139, .184, .159, .14, .146, .157, , .139, .183, .16, .143
];

var color = d3.scale.linear()
    .domain([d3.min(data), d3.max(data)])
    .range(["#aad", "#556"]);

var force = d3.layout.force()
    .charge(0)
    .gravity(0)
    .size([960, 500]);

var svg = d3.select("#chart").append("svg:svg")
    .attr("width", 960 + 100)
    .attr("height", 500 + 100)
  .append("svg:g")
    .attr("transform", "translate(50,50)");

d3.json("us-state-centroids.json", function(states) {

  var project = d3.geo.albersUsa(),
      idToNode = {},
      links = [],
      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]},
      r: Math.sqrt(data[+d.id] * 5000),
      value: data[+d.id]
    };
  });

  force
      .nodes(nodes)
      .links(links)
      .start()
      .on("tick", function(e) {
    var k = e.alpha,
        kg = k * .02;
    nodes.forEach(function(a, i) {
      // Apply gravity forces.
      a.x += (a.gravity.x - a.x) * kg;
      a.y += (a.gravity.y - a.y) * kg;
      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;
        }
      });
    });

    svg.selectAll("circle")
        .attr("cx", function(d) { return d.x; })
        .attr("cy", function(d) { return d.y; });
  });

  svg.selectAll("circle")
      .data(nodes)
    .enter().append("svg:circle")
      .style("fill", function(d) { return color(d.value); })
      .attr("cx", function(d) { return d.x; })
      .attr("cy", function(d) { return d.y; })
      .attr("r", function(d, i) { return d.r; });
});

setInterval(function() {

  console.log('ruf...');

  d3.selectAll("circle")
		.transition()
		.duration(1000)
		.attr("r", function(d) { return Math.floor(Math.random() * (100 - 3 + 1) + 3); });

}, 5000);

## index.html
<!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.js"></script>
    <script type="text/javascript" src="http://mbostock.github.com/d3/d3.layout.js"></script>
    <script type="text/javascript" src="http://mbostock.github.com/d3/d3.geo.js"></script>
    <script type="text/javascript" src="http://mbostock.github.com/d3/d3.geom.js"></script>
<style type="text/css">
    #chart {
  width: 960px;
  height: 500px;
}
circle {
  stroke: #000;
  stroke-width: .5px;
}
</style>
  </head>
  <body>
    <div id="chart"></div>
    <script type="text/javascript" src="dorling.js"></script>
  </body>
</html>

## us-state-centroids.json

      
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	// Ratio of Obese (BMI >= 30) in U.S. Adults, CDC 2008
	var data = [
	, .187, .198, , .133, .175, .151, , .1, .125, .171, , .172, .133, , .108,
	.142, .167, .201, .175, .159, .169, .177, .141, .163, .117, .182, .153, .195,
	.189, .134, .163, .133, .151, .145, .13, .139, .169, .164, .175, .135, .152,
	.169, , .132, .167, .139, .184, .159, .14, .146, .157, , .139, .183, .16, .143
	];

	var color = d3.scale.linear()
	.domain([d3.min(data), d3.max(data)])
	.range(["#aad", "#556"]);

	var force = d3.layout.force()
	.charge(0)
	.gravity(0)
	.size([960, 500]);

	var svg = d3.select("#chart").append("svg:svg")
	.attr("width", 960 + 100)
	.attr("height", 500 + 100)
	.append("svg:g")
	.attr("transform", "translate(50,50)");

	d3.json("us-state-centroids.json", function(states) {

	var project = d3.geo.albersUsa(),
	idToNode = {},
	links = [],
	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]},
	r: Math.sqrt(data[+d.id] * 5000),
	value: data[+d.id]
	};
	});

	force
	.nodes(nodes)
	.links(links)
	.start()
	.on("tick", function(e) {
	var k = e.alpha,
	kg = k * .02;
	nodes.forEach(function(a, i) {
	// Apply gravity forces.
	a.x += (a.gravity.x - a.x) * kg;
	a.y += (a.gravity.y - a.y) * kg;
	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;
	}
	});
	});

	svg.selectAll("circle")
	.attr("cx", function(d) { return d.x; })
	.attr("cy", function(d) { return d.y; });
	});

	svg.selectAll("circle")
	.data(nodes)
	.enter().append("svg:circle")
	.style("fill", function(d) { return color(d.value); })
	.attr("cx", function(d) { return d.x; })
	.attr("cy", function(d) { return d.y; })
	.attr("r", function(d, i) { return d.r; });
	});

	setInterval(function() {

	console.log('ruf...');

	d3.selectAll("circle")
	.transition()
	.duration(1000)
	.attr("r", function(d) { return Math.floor(Math.random() * (100 - 3 + 1) + 3); });

	}, 5000);
	<!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.js"></script>
	<script type="text/javascript" src="http://mbostock.github.com/d3/d3.layout.js"></script>
	<script type="text/javascript" src="http://mbostock.github.com/d3/d3.geo.js"></script>
	<script type="text/javascript" src="http://mbostock.github.com/d3/d3.geom.js"></script>
	<style type="text/css">
	#chart {
	width: 960px;
	height: 500px;
	}
	circle {
	stroke: #000;
	stroke-width: .5px;
	}
	</style>
	</head>
	<body>
	<div id="chart"></div>
	<script type="text/javascript" src="dorling.js"></script>
	</body>
	</html>