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Gradual pixelation
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8" /> | |
| </head> | |
| <body> | |
| <canvas width="960" height="500"></canvas> | |
| <script> | |
| var canvas = document.querySelector("canvas"), | |
| offscreen = document.createElement("canvas"), | |
| context = canvas.getContext("2d"), | |
| offscreenContext = offscreen.getContext("2d"), | |
| width = offscreen.width = canvas.width, | |
| height = offscreen.height = canvas.height, | |
| grain = 64, | |
| up = true, | |
| img = new Image(); | |
| context.msImageSmoothingEnabled = false; | |
| context.mozImageSmoothingEnabled = false; | |
| context.webkitImageSmoothingEnabled = false; | |
| context.imageSmoothingEnabled = false; | |
| img.onload = draw; | |
| img.src = "neon.jpg"; | |
| function draw() { | |
| var dx = Math.round(width / grain), | |
| dy = Math.round(height / grain), | |
| delay = 25; | |
| context.clearRect(0, 0, width, height); | |
| offscreenContext.clearRect(0, 0, width, height); | |
| offscreenContext.drawImage(img, 0, 0, width, height, 0, 0, dx, dy); | |
| context.drawImage(offscreen, 0, 0, dx, dy, 0, 0, width, height); | |
| up ? grain-- : grain++; | |
| if (grain === 64 || grain === 1) { | |
| up = !up; | |
| delay = 500; | |
| } | |
| setTimeout(draw, delay); | |
| } | |
| </script> |
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