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SVG Performance with paths and rounded but long coordinates
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <title>SVG Swarm</title> | |
| <style> | |
| svg { | |
| position: absolute; | |
| top: 0; | |
| } | |
| circle { | |
| fill: steelblue; | |
| stroke: #666; | |
| stroke-width: 1.5px; | |
| } | |
| </style> | |
| <div id="fps">FPS: <span>?</span></div> | |
| <script src="http://d3js.org/d3.v2.min.js?2.9.1"></script> | |
| <script> | |
| var data = d3.range(4000).map(function() { | |
| return {xloc: 0, yloc: 0, xvel: 0, yvel: 0}; | |
| }); | |
| var width = 960, | |
| height = 500; | |
| var x = d3.scale.linear() | |
| .domain([-5, 5]) | |
| .range([0, width]); | |
| var y = d3.scale.linear() | |
| .domain([-5, 5]) | |
| .range([0, height]); | |
| var time0 = Date.now(), | |
| time1; | |
| var fps = d3.select("#fps span"); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var p = svg.append("path") | |
| .data([data]) | |
| .attr("d", function(d) { | |
| return 'M' + d.map(function(x) { return [x.xloc, x.yloc]; }).join('L'); | |
| }); | |
| var fpsqueue = []; | |
| d3.timer(function() { | |
| data.forEach(function(d) { | |
| d.xloc += d.xvel; | |
| d.yloc += d.yvel; | |
| d.xvel += 0.04 * (Math.random() - .5) - 0.05 * d.xvel - 0.0005 * d.xloc; | |
| d.yvel += 0.04 * (Math.random() - .5) - 0.05 * d.yvel - 0.0005 * d.yloc; | |
| }); | |
| p.attr("d", function(d) { | |
| return 'M' + d.map(function(a) { return [(~~x(a.xloc)).toFixed(13), (~~y(a.yloc)).toFixed(13)]; }).join('L'); | |
| }); | |
| time1 = Date.now(); | |
| if (fpsqueue.length === 20) { fps.text(d3.mean(fpsqueue).toFixed(3)); fpsqueue.shift(); } | |
| fpsqueue.push(Math.round(1000 / (time1 - time0))); | |
| time0 = time1; | |
| }); | |
| </script> |
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