public Vector2D getAim() {
        switch(aim) {
            case UP: return new Vector2D(0,-1);
            case DOWN: return new Vector2D(0,1);
            case LEFT: return new Vector2D(-1,0);
            case RIGHT: return new Vector2D(1,0);
            case UP_LEFT: return new Vector2D(-1,-1);
            case UP_RIGHT: return new Vector2D(1,-1);
            case DOWN_LEFT: return new Vector2D(-1,1);
            case DOWN_RIGHT: return new Vector2D(1,1);
        }
        return null;
    }