Created
October 17, 2012 23:46
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Creates a boxshadow based on an image
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| // Create an empty canvas | |
| var canvas = document.createElement('canvas'); | |
| // Create an image | |
| var img = new Image(); | |
| img.src = "http://path/to/image.png"; | |
| // Wait for image to be downloaded | |
| img.onload = function() { | |
| // Draw the image on the canvas | |
| var context = canvas.getContext("2d"); | |
| context.drawImage(img, 0, 0); | |
| // Result variable | |
| var css = ""; | |
| // Loop through every pixel | |
| for(var x=0; x < img.width; ++x) { | |
| for(var y=0; y < img.height; ++y) { | |
| // Get the colors of this specific pixel and append to css | |
| var colors = context.getImageData(x, y, 1, 1).data; | |
| css += x + "px " + y + "px rgba(" + | |
| colors[0] + ", " + | |
| colors[1] + ", " + | |
| colors[2] + ", " + | |
| Math.round((colors[3]/255)*100)/100 + | |
| "),"; | |
| } | |
| } | |
| // Replace last , with ; | |
| css = css.substring(0, css.length-1); | |
| // Do something useful | |
| console.log(css); | |
| }; |
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