Time for action – the ExplosionManager class

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

2. Add declarations to the ExplosionManager class:

   Private _texture As Texture2D
   Private pieceRectangles As List(Of Rectangle) = 
       new List(Of Rectangle)()
   Private _pointRectangle As Rectangle
   
   Private minPieceCount As Integer = 3
   Private maxPieceCount As Integer = 6
   Private minPointCount As Integer = 20
   Private maxPointCount As Integer = 30
   
   Private durationCount As Integer = 90
   Private explosionMaxSpeed As Single = 30
   
   Private pieceSpeedScale As Single = 6
   Private pointSpeedMin As Integer = 15
   Private pointSpeedMax As Integer = 30
   
   Private initialColor As Color = new Color(1.0F, 0.3F, 0.0F) * 0.5
   Private finalColor As Color = new Color(0.0F, 0.0F, 0.0F) * 0
   
   Private rand As Random = new Random()
   
   Private ExplosionParticles As List(Of Particle) = 
       new List(Of Particle)()

3. Add a constructor to the ExplosionManager class:

   Public Sub New (
       Texture As Texture2D,
      ...