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Multi-Foci Force Layout
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| rect{ | |
| fill: white; | |
| } | |
| circle { | |
| stroke: #000; | |
| stroke-opacity: .5; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var nodes = d3.range(5).map(function(i) { | |
| return { | |
| type: Math.random() * 5 | 0, | |
| radius: 30, | |
| fixed: true, | |
| type: i, | |
| x: (i + 1) * (width / 6), | |
| y: height / 2 | |
| }; | |
| }); | |
| var color = d3.scale.category10(); | |
| var force = d3.layout.force() | |
| .gravity(0) | |
| .charge(0) | |
| .nodes(nodes) | |
| .size([width, height]) | |
| .on("tick", ticked); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .on("mousemove", mousemoved); | |
| svg.append("rect") | |
| .attr("width", width) | |
| .attr("height", height); | |
| svg.selectAll("circle") | |
| .data(nodes) | |
| .enter().append("circle") | |
| .attr("r", function(d) { return d.radius - 2; }) | |
| .style("fill", function(d) { return color(d.type); }); | |
| var p0; | |
| force.start(); | |
| function mousemoved() { | |
| var p1 = d3.mouse(this); | |
| p0 = p1; | |
| var node = { | |
| radius: Math.random() * 12 + 4, | |
| type: Math.random() * 5 | 0, | |
| x: p1[0], | |
| y: p1[1], | |
| px: (p0 || (p0 = p1))[0], | |
| py: p0[1] | |
| }; | |
| svg.append("circle") | |
| .data([node]) | |
| .attr("cx", function(d) { return d.x; }) | |
| .attr("cy", function(d) { return d.y; }) | |
| .attr("r", function(d) { return d.radius - 2; }) | |
| .style("fill", function(d) { return color(d.type); }) | |
| .transition() | |
| .delay(3000) | |
| .attr("r", 1e-6) | |
| .each("end", function() { nodes.splice(6, 1); }) | |
| .remove(); | |
| nodes.push(node); | |
| force.resume(); | |
| } | |
| function ticked(e) { | |
| var q = d3.geom.quadtree(nodes), | |
| k = e.alpha * 0.1, | |
| i = 0, | |
| n = nodes.length, | |
| o; | |
| while (++i < n) { | |
| o = nodes[i]; | |
| if (o.fixed) continue; | |
| c = nodes[o.type]; | |
| o.x += (c.x - o.x) * k; | |
| o.y += (c.y - o.y) * k; | |
| q.visit(collide(o)); | |
| } | |
| svg.selectAll("circle") | |
| .attr("cx", function(d) { return d.x; }) | |
| .attr("cy", function(d) { return d.y; }); | |
| } | |
| function collide(node) { | |
| var r = node.radius + 16, | |
| 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) { | |
| l = (l - r) / l * .5; | |
| node.px += x * l; | |
| node.py += y * l; | |
| } | |
| } | |
| return x1 > nx2 | |
| || x2 < nx1 | |
| || y1 > ny2 | |
| || y2 < ny1; | |
| }; | |
| } | |
| </script> |
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Forking and tinkering with this example has been so much fun. Thanks for bringing my attention to it! (I nudged bstaats too. :-)