如何在按键上添加拍摄延迟

本文关键字：添加 延迟 | 更新日期: 2023-09-27 18:34:33

我正在制作一个太空射击游戏，我想知道如何延迟射击而不是向空格键发送垃圾邮件，谢谢:)

public void Shoot()
    {
        Bullets newBullet = new Bullets(Content.Load<Texture2D>("PlayerBullet"));
        newBullet.velocity = new Vector2((float)Math.Cos(rotation), (float)Math.Sin(rotation)) * 5f;
        newBullet.position = playerPosition + playerVelocity + newBullet.velocity * 5;
        newBullet.isVisible = true;
        if (bullets.Count() >= 0)
            bullets.Add(newBullet);
    }

如何在按键上添加拍摄延迟

我认为你想使用XNA的GameTime属性。 每当你发射子弹时，你应该记录它发生的时间作为当前的GameTime.ElapsedGameTime值。

这是一个TimeSpan，因此您可以像下面这样比较它：

// Create a readonly variable which specifies how often the user can shoot.  Could be moved to a game settings area
private static readonly TimeSpan ShootInterval = TimeSpan.FromSeconds(1);
// Keep track of when the user last shot.  Or null if they have never shot in the current session.
private TimeSpan? lastBulletShot;
protected override void Update(GameTime gameTime)
{
    if (???) // input logic for detecting the spacebar goes here
    {
        // if we got here it means the user is trying to shoot
        if (lastBulletShot == null || gameTime.ElapsedGameTime - (TimeSpan)lastBulletShot >= ShootInterval)
        {
            // Allow the user to shoot because he either has not shot before or it's been 1 second since the last shot.
            Shoot();
        }
    }
}

您可以使用一个计数器来计算自上次拍摄以来的帧数。

int shootCounter = 0;

。

if(shootCounter > 15)
{
    Shoot();
    shootcounter = 0;
}
else
{
    shootcounter++;
}

如果您想更高级，可以使用默认更新方法通常为您提供的gameTime来跟踪自上次拍摄以来已经过去了多少次。

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