XNA 4.0 Game Development by Example Beginner's Guide

Time for action – animation and drawing properties

1. Add public properties to allow access to the Sprite class' members:

   public int Frame
   {
       get { return currentFrame; }
       set { currentFrame = (int)MathHelper.Clamp(value, 0, 
             frames.Count - 1); }
   }
   
   public float FrameTime
   {
       get { return frameTime; }
       set { frameTime = MathHelper.Max(0, value); }
   }
   
   public Rectangle Source
   {
       get { return frames[currentFrame]; }
   }
   
   public Rectangle Destination
   {
       get
       {
           return new Rectangle(
               (int)location.X,
               (int)location.Y,
               frameWidth, 
               frameHeight);
       }
   }
   
   public Vector2 Center
   {
       get
       {
           return location + 
               new Vector2(frameWidth / 2, frameHeight / 2);
       }
   }

What just happened?

The set portion of the Frame property uses MathHelper.Clamp() to ensure that when it is set, the value stored ...