XNA選擇Game.Components的分組

Question

天兒真好所有，

我的小遊戲有5個彈跳球和1名球員。最初，我第一次寫的彈跳球代碼和每個球發生碰撞檢測方法：

foreach (Bouncer bouncer in Game.Components) //For each bouncer component in the game... 
     { 
      if (bouncer != this)// Don't collide with myself 
      { 
       if (bouncer.collisionRectangle.Intersects(this.collisionRectangle)) 
       { 
        // How far apart of the positions of the top right hand corners of the sprites when they hit? 
        int deltaX = Math.Abs((int)this.position.X - (int)bouncer.position.X); 
        int deltaY = Math.Abs((int)this.position.Y - (int)bouncer.position.Y); 

        // This is the width and height of a sprite so when two sprites touch this is how far the corners are from each other. 
        int targetWidth = 80; 
        int targetHeight = 80; 

        // The following determins the type of collision (vert hit vs horiz hit) 
        // Because the app is driven by a game based timer the actual amount of sprite overlap when the collision detection occurs is variable. 
        // This bit of simple logic has a 10 pixel tollerance for a hit. 
        // If target - delta is > 10 it will be interpreted as overlap in the non-colliding axis. 
        // If both if statements are triggered it is interpreted as a corner collision resulting in both sprites rebounding back along the original paths. 

        if (targetWidth - deltaX < 10) // The hit is a side on hit. 
        { 
         this.velocity.X *= -1; 
        } 

        if (targetHeight - deltaY < 10) // The hit is a vertical hit 
        { 
         this.velocity.Y *= -1; 
        } 

        this.numberOfCollisions = this.numberOfCollisions + 1; 
       } 
      } 
     } 

     base.Update(gameTime); 
    } 

然後我說我的播放器組件和車輪掉了下來。該應用程序編譯OK，但是當我運行它，我得到一個InvalidCastException和消息：

Unable to cast object of type 'Bounce2.Player' to type 'Bounce2.Bouncer'. 

我並不想在此碰撞檢測玩家的對象。

有沒有一種方法，我可以列舉我的方式，通過彈跳對象，並排除任何其他對象？

感謝， 安德魯。

Answer 1

您可以使用此：

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請注意，您可以存儲在其他列表中的保鏢實例了。