gistfile1.txt

FilterManager.prototype.calculateMagixMatrix = function (filterArea, wt)
{
    var m = new math.Matrix();

    // scale..
    var ratio = this.textureSize.height / this.textureSize.width;

    m.translate(filterArea.x / (this.textureSize.width), filterArea.y / this.textureSize.height);

    m.scale(1 , ratio);

    var transform = wt.clone();
    
    var translateScaleX = (this.textureSize.width / 620);
    var translateScaleY = (this.textureSize.height / 380);

    transform.tx /= 620 * translateScaleX;
    transform.ty /= 620 * translateScaleX;

    transform.invert();
    
    transform.append(m);

    // apply inverse scale..
    transform.scale(1 , 1/ratio);

    transform.scale( translateScaleX , translateScaleY );

    return transform;
}