Some visual changes to Mike Bostock's Canvas Swarm example.
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Canvas Swarm
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <title>Canvas Swarm</title> | |
| <style> | |
| body { | |
| background: darkred; | |
| } | |
| canvas { | |
| position: absolute; | |
| top: 0; | |
| } | |
| </style> | |
| <div id="fps">FPS: <span>?</span></div> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var data = d3.range(1000).map(function() { | |
| return {xloc: 0, yloc: 0, xvel: 0, yvel: 0}; | |
| }); | |
| var width = 960, | |
| height = 500, | |
| angle = 2 * Math.PI; | |
| 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 canvas = d3.select("body").append("canvas") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var context = canvas.node().getContext("2d"); | |
| context.fillStyle = "white"; | |
| context.strokeStyle = "#F00"; | |
| context.strokeWidth = 1; | |
| d3.timer(function() { | |
| context.clearRect(0, 0, width, height); | |
| data.forEach(function(d,i) { | |
| 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; | |
| context.beginPath(); | |
| context.arc(x(d.xloc), y(d.yloc), Math.min(1 + 1000 * Math.abs(d.xvel * d.yvel), 10), 0, angle); | |
| context.fillStyle = i % 2 ? "white" : "black"; | |
| context.fill(); | |
| //context.stroke(); | |
| }); | |
| time1 = Date.now(); | |
| fps.text(Math.round(1000 / (time1 - time0))); | |
| time0 = time1; | |
| }); | |
| </script> |
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