Created
June 3, 2015 04:57
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>United Document</title> | |
| <link rel="stylesheet" href="plasma.css"> | |
| </head> | |
| <body> | |
| <canvas id="plasma" width="255" height="160"></canvas> | |
| <script src="plasma.js"></script> | |
| </body> | |
| </html> |
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| html, body { | |
| margin: 0; | |
| } | |
| canvas { | |
| width: 100%; | |
| height: 100%; | |
| display: block; | |
| margin: auto; | |
| } |
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| var plasmate = function (canvasID, fn, map) { | |
| var drawFrame = function () { | |
| var w = canvas.width, h = canvas.height; | |
| var now = Date.now() / (1024); | |
| var imageData = context.getImageData(0, 0, w, h); | |
| var pixels = imageData.data; | |
| var kx = w / h; | |
| for (var y = 0; y < h; y++) { | |
| var yy = y / h - 0.5; | |
| for (var x = 0; x < w; x++) { | |
| var xx = kx * x / w - kx / 2; | |
| var v = fn(xx, yy, now); | |
| map(pixels, (y * w + x) * 4, v); | |
| } | |
| } | |
| context.putImageData(imageData, 0, 0); | |
| }; | |
| var animate = function () { | |
| drawFrame(); | |
| requestAnimationFrame(animate); // Retake, retake! | |
| }; | |
| var canvas = document.getElementById(canvasID); | |
| var context = canvas.getContext('2d'); | |
| if (! context) return 'canvas not found: #' + canvasID; | |
| animate(); | |
| }; | |
| var skinMap = function colorMap1(px, offset, v) { | |
| var c = 255 * (0.5 + 0.5 * v * 0.8); | |
| px[offset+0] = c; | |
| px[offset+1] = c / 2; | |
| px[offset+2] = c / 3; | |
| px[offset+3] = 255; | |
| }; | |
| plasmate('plasma', function(x, y, time) { | |
| var v = Math.sin((x*10+time)); | |
| v += Math.sin(10*(x*Math.sin(time/20)+y*Math.cos(time/3))+time); | |
| var cx = y + 0.5 * Math.sin(time/250.0); | |
| var cy = x + 0.5 * Math.cos(time/230.0); | |
| v += Math.sin(Math.sqrt(100*(cx*cx+cy*cy)+1)+time); | |
| return v/2; | |
| }, skinMap); | |
| // Adapted from http://www.bidouille.org/prog/plasma |
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