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Pseudo-Dorling Cartogram
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| license: gpl-3.0 |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!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("https://gist.githubusercontent.com/mbostock/3750900/raw/91fe3afc0d94dc44348fd939df5843a0707d24aa/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> |
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