Created
October 26, 2011 16:08
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Beeswarm plot with gravity and collisions
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/> | |
| <title>Beeswarm plot - collision detection</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.geom.js"></script> | |
| <script type="text/javascript" src="http://mbostock.github.com/d3/d3.layout.js"></script> | |
| </head> | |
| <body> | |
| <div id="body"> | |
| <div id="chart"></div> | |
| </div> | |
| <script type="text/javascript"> | |
| function norm() { | |
| var res, i; | |
| res = 0; | |
| for (i = 0; i < 10; i += 1) { | |
| res += Math.random()*2-1 | |
| } | |
| return res; | |
| } | |
| var w = 500, | |
| h = 500; | |
| var nodes = d3.range(400).map(function() { | |
| var true_y = (norm()*50)+250; | |
| return { | |
| radius: 4, | |
| y: true_y, | |
| true_x: 250, | |
| true_y: true_y } | |
| }); | |
| var force = d3.layout.force() | |
| .gravity(0) | |
| .charge(0) | |
| .friction(0.9) | |
| .nodes(nodes) | |
| .size([w, h]); | |
| var root = nodes[0]; | |
| root.radius = 0; | |
| root.fixed = true; | |
| force.start(); | |
| var svg = d3.select("#chart").append("svg:svg") | |
| .attr("width", w) | |
| .attr("height", h); | |
| svg.selectAll("circle") | |
| .data(nodes) | |
| .enter().append("svg:circle") | |
| .attr("r", function(d) { return d.radius; }) | |
| .style("fill", 'steelblue') | |
| .style("stroke", "black"); | |
| force.on("tick", function(e) { | |
| var q, | |
| node, | |
| i = 0, | |
| n = nodes.length; | |
| var q = d3.geom.quadtree(nodes); | |
| while (++i < n) { | |
| node = nodes[i]; | |
| q.visit(collide(node)); | |
| xerr = node.x - node.true_x; | |
| yerr = node.y - node.true_y; | |
| node.x -= xerr*0.005; | |
| node.y -= yerr*0.8; | |
| } | |
| svg.selectAll("circle") | |
| .attr("cx", function(d) { return d.x; }) | |
| .attr("cy", function(d) { return d.y; }); | |
| }); | |
| function collide(node) { | |
| var r = node.radius, | |
| nx1, | |
| nx2, | |
| ny1, | |
| ny2, | |
| xerr, | |
| yerr; | |
| nx1 = node.x - r; | |
| nx2 = node.x + r; | |
| ny1 = node.y - r; | |
| ny2 = node.y + r; | |
| return 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 = Math.sqrt(x * x + y * y), | |
| r = node.radius + quad.point.radius; | |
| if (l < r) { | |
| // we're colliding. | |
| var xnudge, ynudge, nudge_factor; | |
| nudge_factor = (l - r) / l * .4; | |
| xnudge = x*nudge_factor; | |
| ynudge = y*nudge_factor; | |
| node.x -= xnudge; | |
| node.y -= ynudge; | |
| quad.point.x += xnudge; | |
| quad.point.y += ynudge; | |
| } | |
| } | |
| return x1 > nx2 | |
| || x2 < nx1 | |
| || y1 > ny2 | |
| || y2 < ny1; | |
| }; | |
| } | |
| </script> | |
| </body> | |
| </html> |
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