Time for action – rotating pieces

1. Open your existing Flood Control project in Visual C# Express if it is not already active.

2. Add a new class to the project called "RotatingPiece".

3. Add "using Microsoft.Xna.Framework;" to the using area at the top of the class.

4. Update the declaration of the class to read class RotatingPiece : GamePiece.

5. Add the following declarations to the RotatingPiece class:

   public bool clockwise;
   
   public static float rotationRate = (MathHelper.PiOver2 / 10);
   private float rotationAmount = 0;
   public int rotationTicksRemaining = 10;

6. Add a property to retrieve the current rotation amount:

   public float RotationAmount
   {
       get 
       {
           if (clockwise)
               return rotationAmount;
           else
               return (MathHelper.Pi*2) - rotationAmount;            
       }
   }

7. Add a constructor for the RotatingPiece class:

   public RotatingPiece(string pieceType, bool clockwise) 
       : base(pieceType)
   {
       this.clockwise = clockwise;
   }

8. Add a method to update the piece:

   public void UpdatePiece...