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Circles
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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.
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var w = 960, | |
| h = 500; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", w) | |
| .attr("height", h); | |
| var circle = svg.selectAll("circle") | |
| .data(d3.range(1000).map(function() { | |
| return { | |
| x: w * Math.random(), | |
| y: h * Math.random(), | |
| dx: Math.random() - 0.5, | |
| dy: Math.random() - 0.5 | |
| }; | |
| })) | |
| .enter().append("circle") | |
| .attr("r", 2.5); | |
| var text = svg.append("text") | |
| .attr("x", 20) | |
| .attr("y", 20); | |
| var start = Date.now(), | |
| frames = 0; | |
| d3.timer(function() { | |
| // Update the FPS meter. | |
| var now = Date.now(), duration = now - start; | |
| text.text(~~(++frames * 1000 / duration)); | |
| if (duration >= 1000) frames = 0, start = now; | |
| // Update the circle positions. | |
| circle | |
| .attr("cx", function(d) { d.x += d.dx; if (d.x > w) d.x -= w; else if (d.x < 0) d.x += w; return d.x; }) | |
| .attr("cy", function(d) { d.y += d.dy; if (d.y > h) d.y -= h; else if (d.y < 0) d.y += h; return d.y; }); | |
| }); | |
| </script> |
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