Time for action – animation and drawing properties

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

   Public Property Frame As Integer
       Get
           Return currentFrame
       End Get
   
       Set(value as Integer)
           currentFrame = CInt(MathHelper.Clamp(value, 0,
             frames.Count - 1))
       End Set
   End Property
   
   Public Property FrameTime As Single
       Get
           return _frameTime
       End Get
   
       Set(value as Single)
           _frameTime = MathHelper.Max(0, value)
       End Set
   End Property
   
   Public ReadOnly Property Source As Rectangle
       Get
           return frames(currentFrame)
       End Get
   End Property
   
   Public ReadOnly Property Destination As Rectangle
       Get
           return new Rectangle(
               CInt(location.X),
               CInt(location.Y),
               frameWidth, 
               frameHeight)
       End Get
   End Property
   
   Public ReadOnly Property Center As Vector2
       Get
           return _location + 
               new Vector2(CSng(frameWidth) / 2, CSng(frameHeight...