/// <summary>
/// Removes a ball from the physics engine.
/// </summary>
/// <param name="ball">The ball to be removed.</param>
public void Remove(Ball ball)
{
physics.Remove(ball.PhysicsReference);
if (numberedBalls.Contains(ball))
{
numberedBalls.Remove(ball);
}
}
/// <summary>
/// Removes bullets from the system if they have gone past all the asteroids.
/// </summary>
public void Update()
{
foreach (Bullet bullet in bullets)
{
if (bullet != null && bullet.Active && bullet.Position.Z < ((-1) * (GameConstants.cameraMaxDistance - GameConstants.cameraHeight)))
{
physics.Remove(bullet.PhysicsReference);
bullet.Active = false;
}
}
}
/// <summary>
/// Removes asteroids from the system if they have gone outside of the playing field.
/// </summary>
public void Update()
{
foreach (Asteroid asteroid in asteroids)
{
if (asteroid != null && asteroid.Active && (asteroid.Position.Z > GameConstants.cameraHeight ||
asteroid.Position.Z < -GameConstants.cameraMaxDistance ||
asteroid.Position.Y > GameConstants.playfieldSizeY ||
asteroid.Position.Y < -GameConstants.playfieldSizeY ||
asteroid.Position.X > GameConstants.playfieldSizeX ||
asteroid.Position.X < -GameConstants.playfieldSizeX))
{
physics.Remove(asteroid.PhysicsReference);
numAsteroids--;
if (asteroid.Position.Z > GameConstants.cameraHeight)
{
Score.AsteroidPassed();
}
asteroid.Active = false;
}
}
}
/// <summary>
/// Updates each explosion in the explosion array.
/// </summary>
/// <param name="gameTime">A structure that takes a snapshot of the games timing state.</param>
public void Update(GameTime gameTime)
{
foreach (Explosion explosion in explosions)
{
// Start an explosion
if (explosion != null && explosion.Active && explosion.LifeTime == 0.0f)
{
explosion.LifeTime = GameConstants.timeToDisplayEffect;
}
// Decrement the life time of the explosion
else if (explosion != null && explosion.Active && explosion.LifeTime != 0.0f)
{
explosion.LifeTime -= (float)gameTime.ElapsedGameTime.TotalMilliseconds;
}
// Remove the explosion once it has displayed for its entire life time.
if (explosion != null && explosion.Active && explosion.LifeTime < 0)
{
physics.Remove(explosion.PhysicsReference);
numExplosions--;
explosion.Active = false;
}
}
}
