@Override
    public void draw(Batch batch, float x, float y, float width, float height) {
        drawable1.draw(batch, x, y, width, height);
        drawable2.draw(batch, x, y, width, height);
    }
@param drawable1 the drawable to be drawn on the bottom of the stack
@param drawable2 the drawable to be drawn on the top of the stack
core/src/com/ray3k/skincomposer/StackedDrawable.java