donpark

/* Following canvas-based Perlin generation code originates from
 * iron_wallaby's code at: http://www.ozoneasylum.com/30982
 */
function randomNoise(canvas, x, y, width, height, alpha) {
    x = x || 0;
    y = y || 0;
    width = width || canvas.width;
    height = height || canvas.height;
    alpha = alpha || 255;
    var g = canvas.getContext("2d"),