Created
May 3, 2017 23:46
-
-
Save veltman/e7778d9ce18d66c04cbbede51c32957d to your computer and use it in GitHub Desktop.
Gradual pixelation
This file contains hidden or 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> | |
| <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> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment