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针对Bug #8 |
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当蛇向右移动到右侧边界时，你快速按下向下或向上和向左的方向键。由于蛇在移动过程中，方向的改变可能没有按照预期的顺序进行，或者在一个短时间内方向改变过于频繁，导致蛇头在下次移动时直接移动到了身体所在的位置，游戏结束。同理，当蛇向其他方向(向左、向上、向下)时，同时按下相反方向和相邻方向都会导致蛇误判为撞到自己，游戏结束。
为了避免这种情况，可以在 setMoveDirection 函数中添加更多的逻辑，确保蛇在一个较短的时间内不能进行过于频繁的方向改变。例如，可以添加一个计数器，记录蛇最近一次改变方向的时间，只有当时间间隔超过一定值时，才允许蛇改变方向。
msecsTo() 是 QTime 类的另一个成员函数，用于计算从当前 QTime 对象（lastDirectionChangeTime）到指定 QTime 对象（currentTime）之间的毫秒数差值。
lastDirectionChangeTime 是一个 QTime 类型的对象，用于记录蛇上一次改变方向的时间。
isValid() 是 QTime 类的一个成员函数，用于检查该 QTime 对象是否包含一个有效的时间值。