XNA 4.0 Game Development by Example Beginner's Guide

Time for action – updating and drawing explosions

1. Add the Update() method to the ExplosionManager class:

   public void Update(GameTime gameTime)
   {
       for (int x = ExplosionParticles.Count-1; x >= 0; x--)
       {
           if (ExplosionParticles[x].IsActive)
           {
               ExplosionParticles[x].Update(gameTime);
           }
           else
           {
               ExplosionParticles.RemoveAt(x);
           }
       }
   }

2. Add the Draw() method to the ExplosionManager class:

   public void Draw(SpriteBatch spriteBatch)
   {
       foreach (Particle particle in ExplosionParticles)
       {
           particle.Draw(spriteBatch);
       }
   }

3. Add an instance of the ExplosionManager to the declarations area of the Game1.cs class file:

   ExplosionManager explosionManager;

4. Still in the Game1 class, add the initialization of the explosionManager object to the LoadContent() method:

   explosionManager ...