mbostock/.block

## .block
license: gpl-3.0

## README.md

      
    Raw
  

              README.md
            
          
    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.

  
## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<title>Dorling Cartogram</title>
<style>

circle {
  fill: #eee;
  stroke: #000;
  stroke-width: 1.5px;
}

</style>
<body>
<script src="//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("us-state-centroids.json", function(error, states) {
  if (error) throw error;

  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>

## thumbnail.png

      
    Raw
  

              thumbnail.png
            
          
## us-state-centroids.json

      
Display the source blob

    
Display the rendered blob

    
    Raw
  

              us-state-centroids.json
            
          
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          Viewer requires iframe.
	<!DOCTYPE html>
	<meta charset="utf-8">
	<title>Dorling Cartogram</title>
	<style>

	circle {
	fill: #eee;
	stroke: #000;
	stroke-width: 1.5px;
	}

	</style>
	<body>
	<script src="//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("us-state-centroids.json", function(error, states) {
	if (error) throw error;

	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>