Time for action – the GoalManager class

1. Add a new class called GoalManager to the Robot Rampage project.

2. Add the following using directives to the top of the class file:

   using Microsoft.Xna.Framework;
   using Microsoft.Xna.Framework.Graphics;

3. Modify the declaration of the GoalManager class to make it a static class:

   static class GoalManager

4. Add declarations to the GoalManager class:

   #region Declarations
   private static List<ComputerTerminal> computerTerminals = 
       new List<ComputerTerminal>();
   private static int activeCount = 0;
   
   private static int minDistanceFromPlayer = 250;
   
   private static Random rand = new Random();
   
   private static Texture2D texture;
   private static Rectangle initialActiveFrame;
   private static Rectangle initialDisabledFrame;
   private static int activeFrameCount;
   private static int disabledFrameCount;
   #endregion

5. Add a read-only property to the GoalManager class:

   #region Properties
   public static int ActiveTerminals
   {
       get { return activeCount; }
   }
   #endregion

6. Add the...