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Particle Experiments II
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <meta charset="utf-8"> | |
| <title>JS Bin</title> | |
| </head> | |
| <body> | |
| <script> | |
| var margin = { top: 50, left: 50, bottom: 50, right: 50 }, | |
| width = 1200 - margin.left - margin.right, | |
| height = 500 - margin.top - margin.bottom; | |
| var canvas = d3.select('body').style({ width: "95vw" }) | |
| .append('canvas') | |
| .attr({ | |
| width: width, | |
| height: height | |
| }) | |
| .style({ | |
| display: "block", margin: "0 auto", width: "500px", "margin-top": "100px" | |
| }) | |
| .node().getContext('2d'); | |
| var n = 3e3; | |
| var random = d3.random.normal(); | |
| function newData() { return { x: Math.random() - 0.5, y: random(), vel: 0 }; } | |
| var data = d3.range(n).map(newData); | |
| var x = d3.scale.linear() | |
| .domain(d3.extent(data, function(d) { return d.x; })) | |
| .range([0 + 20, width - 20]); | |
| var y = d3.scale.linear() | |
| .domain(d3.extent(data, function(d) { return d.y; })) | |
| .range([height - 50, 50]); | |
| var rate = 2.0, sample = n * 0.5; | |
| var random2 = d3.random.normal(Math.floor(sample), 10); | |
| d3.timer(function() { | |
| data.forEach(function(d) { | |
| // d.vel += 0.003 * random() - 0.002 * d.vel - 0.03 * d.x; With random() | |
| // d.vel += 0.003 * random() - 0.9 * d.vel - 0.003 * d.x; | |
| d.vel += 0.003 * random() - 1 * d.vel - 0.004 * d.x; | |
| d.x += d.vel; | |
| }); | |
| drawWithCanvas(); | |
| }); | |
| canvas.globalAlpha = 0.2; | |
| function drawWithCanvas() { | |
| canvas.clearRect(0, 0, width, height); | |
| var outside = false; | |
| if (outside) canvas.beginPath(); | |
| data.forEach(function(d) { | |
| var cx = x( d.x ); | |
| var cy = y( d.y ); | |
| if (!outside) canvas.beginPath(); | |
| canvas.moveTo(cx, cy); | |
| canvas.arc(cx-10, cy, 8, 0, 2 * Math.PI); | |
| if (!outside) canvas.stroke(); | |
| }); | |
| if (outside) canvas.stroke(); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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