Time for action – creating the EnemyManager class

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

2. Add declarations to the EnemyManager class:

   Private _texture As Texture2D
   Private _initialFrame As Rectangle
   Private _frameCount As Integer
   
   Public Enemies As List(Of Enemy) = New List(Of Enemy)()
   
   Public EnemyShotManager As ShotManager
   Private _playerManager As PlayerManager
   
   Public MinShipsPerWave As Integer = 5
   Public MaxShipsPerWave As Integer = 8
   Private nextWaveTimer As Single = 0.0
   Private nextWaveMinTimer As Single = 8.0
   Private shipSpawnTimer As Single = 0.0
   Private shipSpawnWaitTime As Single = 0.5
   
   Private shipShotChance As Single = 0.2
   
   Private pathWaypoints As List(Of List(Of Vector2)) = 
       New List(Of List(Of Vector2))()
   
   Private waveSpawns As Dictionary(Of Integer, Integer) = 
       New Dictionary(Of Integer, Integer)()
   
   Public Active As Boolean = True
   
   Private rand As Random = New Random()

What just happened?

As with our other manager classes, the EnemyManager...