Time for action – constructing the Particle class

1. Add a new class called Particle to the Asteroid Belt Assault project.

2. Modify the declaration of the class by adding the following line below Public Class Particle:

   Inherits Sprite

3. Add declarations to represent the additional members of the Particle class (beyond those of the Sprite class):

   Private _acceleration As Vector2
   Private _maxSpeed As Single
   Private initialDuration As Integer
   Private remainingDuration As Integer
   Private _initialColor As Color
   Private _finalColor As Color

4. Add properties to access the information about the underlying members:

   Public ReadOnly Property ElapsedDuration As Integer
       Get
           Return initialDuration - remainingDuration
       End Get
   End Property
   
   Public ReadOnly Property DurationProgress As Single
       Get
           Return CSng(ElapsedDuration)/CSng(initialDuration)
       End Get
   End Property
   
   Public ReadOnly Property IsActive As Boolean
       Get
           Return remainingDuration > 0
       End Get
   End Property

5. Add...