Time for action – updating and drawing asteroids

1. Add the Update() and Draw() methods to the AsteroidManager class:

   public void Update(GameTime gameTime)
   {
       foreach (Sprite asteroid in Asteroids)
       {
   
           asteroid.Update(gameTime);
           if (!isOnScreen(asteroid))
           {
               asteroid.Location = randomLocation();
               asteroid.Velocity = randomVelocity();
           }
       }
   }
   
   public void Draw(SpriteBatch spriteBatch)
   {
       foreach (Sprite asteroid in Asteroids)
       {
           asteroid.Draw(spriteBatch);
       }
   }

2. Add a declaration for the AsteroidManager in the declarations section of the Game1 class:

   AsteroidManager asteroidManager;

3. In the Game1 class' LoadContent() method, initialize asteroidManager after the initialization of the starField object:

   asteroidManager = new AsteroidManager(
       10,
       spriteSheet,
       new Rectangle(0, 0, 50, 50),
       20,
       this.Window.ClientBounds.Width,
       this.Window.ClientBounds.Height);

4. Add the following line to Game1's Update() method...