Time for action – the Particle class

1. Add a new class file to the Robot Rampage project called Particle.cs.

2. Add the following using directives to the Particle class:

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

3. Update the class declaration for the Particle class to derive it from the Sprite class:

   class Particle : Sprite

4. Add declarations to the Particle class:

   #region Declarations
   private Vector2 acceleration;
   private float maxSpeed;
   private int initialDuration;
   private int remainingDuration;
   private Color initialColor;
   private Color finalColor;
   #endregion

5. Add properties to the Particle class:

   #region Properties
   public int ElapsedDuration
   {
       get
       {
           return initialDuration - remainingDuration;
       }
   }
   
   public float DurationProgress
   {
       get
       {
           return (float)ElapsedDuration /
               (float)initialDuration;
       }
   }
   
   public bool IsActive
   {
       get
       {
           return (remainingDuration > 0);
       }
   }
   #endregion

6. Add a constructor to the Particle...