public void useGravity(BlackHole bh) {
        calculateGravity(bh);

        if (x + FONT_SIZE/2 < bh.getX() + bh.getWidth() / 2) {
            vx += gravity;
        }

        if (x + FONT_SIZE/2 > bh.getX() + bh.getWidth() / 2) {
            vx -= gravity;
        }

        if (y + FONT_SIZE/2 < bh.getY() + bh.getHeight() / 2) {
            vy += gravity;
        }

        if (y + FONT_SIZE/2 > bh.getY() + bh.getHeight() / 2) {
            vy -= gravity;
        }
    }