Time for action – using the CollisionManager class

1. Add the CheckCollisions() method to the CollisionManager class:

   Public Sub CheckCollisions()
       checkShotToEnemyCollisions()
       checkShotToAsteroidCollisions()
       If Not _playerManager.Destroyed Then
           checkShotToPlayerCollisions()
           checkEnemyToPlayerCollisions()
           checkAsteroidToPlayerCollisions()
       End If
   End Sub

2. Add a declaration for the CollisionManager to the Game1 declarations area:

   Private _collisionManager As CollisionManager

3. Initialize the CollisionManager in the LoadContent() method of the Game1 class, after the ExplosionManager has been initialized:

   _collisionManager = new CollisionManager(
       _asteroidManager,
       _playerManager,
       _enemyManager,
       _explosionManager)

4. In the Game1 class' Update() method, in the GameStates.Playing section, add the following after the ExplosionManager is updated:

   _collisionManager.CheckCollisions()

5. Launch the game to view collision detection and explosion effects. After your...