Question

我正在进行一场乒乓球比赛。

当球击中任一桨时，它会触发声音效果。但问题是，XNA更新了60 fps。因此，有时我会听到我的sfx触发器在初始碰撞过程中发出的微弱声音。

我想这样做，以便SFX触发器熄灭一次，然后再次发生，直到： A）球得分要么 B）球与对面的球碰撞。

我可以采取什么样的方法来做这样的事情？

这是我的触发器目前的样子，在我的球类中：

        /// <summary>
    /// Draws a rectangle where the ball and bat collide. Also triggers the SFX for when they collide
    /// </summary>
    private void BatCollisionRectLeft()
    {
        // For the left bat
        if (ballRect.Intersects(leftBat.batRect))
        {
            rectangle3 = Rectangle.Intersect(ballRect, leftBat.batRect);
            hasHitLeftBat = true;
            lastHitLeftBat = true;
            lasthitRightBat = false;
            AudioManager.Instance.PlaySoundEffect("hit2");
            Speed += .2f;            // Gradually increases the ball's speed each time it connects with the bat
        }
    }

然后在我的球的更新函数中调用该函数，该函数由XNA中的主要游戏类调用。

        /// <summary>
    /// Updates position of the ball. Used in Update() for GameplayScreen.
    /// </summary>
    public void UpdatePosition(GameTime gameTime)
    {
              .......

    // As long as the ball is to the right of the back, check for an update
        if (ballPosition.X > leftBat.BatPosition.X)
        {
            // When the ball and bat collide, draw the rectangle where they intersect
            BatCollisionRectLeft();
        }

        // As long as the ball is to the left of the back, check for an update
        if (ballPosition.X < rightBat.BatPosition.X)

        {   // When the ball and bat collide, draw the rectangle where they intersect
            BatCollisionRectRight();
        }
                     ........
              }

Answer 1

解决方案看起来像这样。这段代码没有经过测试也没有功能，它只是针对这个想法。从某种程度上说，你有一个等待一段时间（ms）的计时器，它会再次播放声音;要再次播放声音，必须满足碰撞检测请求。这是一个简单的延迟计时器。

float timer = 0, timerInterval = 100;
bool canDoSoundEffect = true;
...
void Update(GameTime gt) {
    float delta = (float)gt.ElapsedTime.TotalMilliseconds;

    // Check if we can play soundeffect again
    if (canDoSoundEffect) {
        // Play soundeffect if collided and set flag to false
        if (ballRect.Intersects(leftBat.batRect)) {

            ... Collision logic here...

            AudioManager.Instance.PlaySoundEffect("hit2");
            canDoSoundEffect = false;
        }
    }
    // So we can't play soundeffect - it means that not enough time has passed 
    // from last play so we need to increase timer and when enough time passes, 
    // we set flag to true and reset timer
    else {
        timer += delta;
        if (timer >= timerInterval) {
            timer -= timerInterval;
            canDoSoundEffect = true;
        }
    }
}

Answer 2

你可以有一个布尔变量来指示先前的碰撞状态。

如果myPreviousCollisionState = false，myCurrentCollisionState = true - ＆gt; 播放声音，改变方向等...

在更新通话结束时，您可以设置

myPreviousCollisionState = myCurrentCollisionState

显然，在游戏开始时，myPreviousCollisionState = false

使用该代码，您的声音将仅在碰撞的第一帧播放。

希望这有帮助！

连续多次停止更新

2 个答案: