每像素碰撞檢測

Question

在XNA中創建2D地獄主題直升機遊戲。

我的Per Pixel碰撞檢測有一些問題，因爲它在顏色沒有碰撞時返回true。

這裏是我的每個像素的代碼：

class PPCollisionDetection 
{ 
    public Rectangle rect1, rect2; 
    public Color[] data1, data2; 

    public PPCollisionDetection() 
    { 
    } 

    public Boolean Detect(Rectangle r1, Rectangle r2, Texture2D t1, Texture2D t2) 
    { 
     data1 = new Color[t1.Width * t1.Height]; 
     t1.GetData(data1); 
     data2 = new Color[t2.Width * t2.Height]; 
     t2.GetData(data2); 

     rect1 = r1; 
     rect2 = r2; 

     int top = Math.Max(rect1.Top, rect2.Top); 
     int bottom = Math.Min(rect1.Bottom, rect2.Bottom); 
     int left = Math.Max(rect1.Left, rect2.Left); 
     int right = Math.Min(rect1.Right, rect2.Right); 

     for (int y = top; y < bottom; y++) 
      for (int x = left; x < right; x++) 
      { 
       Color colour1 = data1[(x - rect1.Left) + 
             (y - rect1.Top) * rect1.Width]; 
       Color colour2 = data2[(x - rect2.Left) + 
             (y - rect2.Top) * rect2.Width]; 

       if (colour1.A != 0 && colour2.A != 0) 
        return true; 
      } 
     return false; 
    } 
} 

這裏就是我所說的檢測：

if (new Rectangle((int)Helicopter.position.X,(int) Helicopter.position.Y,(int)Helicopter.HelicopterAnimation.Rectangle.Width,(int)Helicopter.HelicopterAnimation.Rectangle.Height).Intersects(stalagtiteRectangle)) 
{ 
    if (collDetect.Detect(new Rectangle((int)Helicopter.position.X, (int)Helicopter.position.Y, (int)Helicopter.HelicopterAnimation.Rectangle.Width, (int)Helicopter.HelicopterAnimation.Rectangle.Height), stalagtiteRectangle, Helicopter.HelicopterAnimation.animation, 
     stalagtites)) 
    { 
     touched = true; 
    } 
    else 
    { 
     touched = false; 
    } 
} 

Answer 1

你並不真的需要一個矩形碰撞，因爲你已經檢查每個像素的碰撞。

而且我相信它應該是：

t1.GetData<Color>(data1); 
t2.GetData<Color>(data2);