XNA 4.0 Game Development by Example Beginner's Guide

Time for action – staying in bounds

1. Create a region called "Movement Limitations" in the Player class:

   #region Movement Limitations
   #endregion

2. Inside the Movement Limitations region, add the clampToWorld() method:

   private static void clampToWorld()
   {
       float currentX = BaseSprite.WorldLocation.X;
       float currentY = BaseSprite.WorldLocation.Y;
   
       currentX = MathHelper.Clamp(
           currentX, 
           0, 
           Camera.WorldRectangle.Right - BaseSprite.FrameWidth);
   
       currentY = MathHelper.Clamp(
           currentY,
           0,
           Camera.WorldRectangle.Bottom - BaseSprite.FrameHeight);
   
       BaseSprite.WorldLocation = new Vector2(currentX, currentY);
   }

3. Add a declaration to the Player class to define the area in which the camera should attempt to keep the player:

   private static Rectangle scrollArea = new Rectangle(150, ...