在XNA中显示全屏相机

Question

全部我想在Windows Phone中用XNA显示全屏相机（Microsoft.Devices.PhotoCamera），如下面的代码所示，我试图改变screenpos和原点的值，但是它没有工作，我的代码有什么问题？由于

if (CameraTexture != null) 
     { 
      Vector2 origin = new Vector2(CameraTexture.Width/2, CameraTexture.Height/2); 
      Vector2 screenpos = new Vector2(240, 400); 
      spriteBatch.Draw(CameraTexture, screenpos, null, Microsoft.Xna.Framework.Color.White, (float)Math.PI/2, 
      origin, 1.0f, SpriteEffects.None, 0f); 
     } 

Answer 1

OK，我知道了

Microsoft.Xna.Framework.Rectangle rec = new Microsoft.Xna.Framework.Rectangle(0, 0, (int)ActualWidth, (int)ActualHeight); 

spriteBatch.Draw（纹理，REC，Microsoft.Xna.Framework.Color.White）;