akm2

var getImageNaturalSize = function(img){
    var w = img.width,
        h = img.height,
		tw, th; // Temp
 
    if (typeof img.naturalWidth !== undefined) { // for Firefox, Safari, Chrome
        w = img.naturalWidth;
        h = img.naturalHeight;
    } else if (typeof img.runtimeStyle !== undefined) { // for IE
        var run = img.runtimeStyle;

akm2

function isImageLoaded(img) {
    if (!img.complete) return false;
    if (typeof img.naturalWidth !== 'undefined' && img.naturalWidth === 0) return false;
    return true;
}

function onImageLoaded(img, callback) {
    if (isImageLoaded(img)) callback.call(img);
    else img.addEventListener('load', callback, false);
}

akm2

/**
 * Vector2d
 */
function Vector2d(x, y) {
    this.x = x || 0;
    this.y = y || 0;
}

Vector2d.add = function(a, b) {
    return new Vector2d(a.x + b.x, a.y + b.y);

akm2

var log = (function(c) {
    var limit = 1000, count = 0;
    
    function log() {
        if (limit) { if (limit === count) return; count++; }
        c.log.apply(c, arguments);
        return log;
    }
    
    log.limit = function(_limit) { limit = _limit < 0 ? 0 : _limit; return log; };

akm2

function printf(format) {
    var pattern;
    for (var i = 0, len = arguments.length - 1; i < len; i++) {
        pattern = new RegExp('\\{' + i + '\\}', 'g');
        format = format.replace(pattern, arguments[i + 1]);
    }
    return format;
}

// printf('Hello {0}', 'World'); // Hello World

akm2

var Random = (function() {
    
    /**
     * Alea, Mash function
     * 
     * @see http://baagoe.com/en/RandomMusings/javascript/
     */
    function Random() {
        var s0 = 0, s1 = 0, s2 = 0, c = 1;