Created
November 16, 2012 17:13
-
-
Save tmcw/4089090 to your computer and use it in GitHub Desktop.
SVG Performance with paths and rounded but long coordinates
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>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 === 100) { fps.text(d3.mean(fpsqueue).toFixed(3)); fpsqueue.pop(); } | |
| fpsqueue.push(Math.round(1000 / (time1 - time0))); | |
| time0 = time1; | |
| }); | |
| </script> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment