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public void update(GameContainer container, StateBasedGame game, int delta) {
        float mouseX = container.getInput().getMouseX();
        float mouseY = container.getInput().getMouseY();
        float xDistance = mouseX - position.x;
        float yDistance = mouseY - position.y;
        double angle = Math.toDegrees(Math.atan2(yDistance, xDistance));
        gun.setRotation((float) angle);
}