Time for action – rotating pieces

1. Open your existing Flood Control project in Visual Studio, if it is not already active.

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

3. Under the class declaration (Public Class RotatingPiece), add the following line:

   Inherits GamePiece

4. Add the following declarations to the RotatingPiece class:

   Public Clockwise As Boolean
   Public Shared RotationRate As Single = (MathHelper.PiOver2/10)
   Private _rotationAmount As Single
   Public rotationTicksRemaining As Single = 10

5. Add a property to retrieve the current RotationAmount:

   Public ReadOnly Property RotationAmount As Single
       Get
           If Clockwise Then
               Return _rotationAmount
           Else
               Return (MathHelper.Pi * 2) - _rotationAmount
           End If
       End Get
   End Property

6. Add a constructor for the RotatingPiece class as follows:

   Public Sub New(type As String, clockwise As Boolean)
       MyBase.New(type)
       Me.Clockwise = clockwise
   End Sub

7. Add a method to update the piece as follows:

   Public Sub...