/// <summary>
/// Allows the game component to update itself.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
public override void Update(GameTime gameTime)
{
if (Alive)
{
// Will wait a certain time before bringing the ship back on screen.
if (ship.MovedOut(currentDir))
{
betweenAppearances = new TimeSpan(0, 0, 0, randomize.Next(2, 10));
if (gameTime.TotalGameTime - lastAppearance > betweenAppearances)
{
if (currentDir == Direction.RIGHT)
{
currentDir = Direction.LEFT;
}
else
{
currentDir = Direction.RIGHT;
}
ship.Move(currentDir);
}
}
else
{
ship.Move(currentDir);
lastAppearance = gameTime.TotalGameTime;
}
bomb.Launch(Boundary, gameTime);
}
base.Update(gameTime);
}
/// <summary>
/// This selects at random an alien and then lauches a projectile from its
/// position if it is alive.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values</param>
private void generateProjectile(GameTime gameTime)
{
int alien = alienBombing.Next(0, aliens.Length - 1);
if (this[alien].Alive)
{
bomb.Launch(this[alien].Boundary, gameTime);
}
}
/// <summary>
/// Launches the bonus bomb.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
public override void Update(GameTime gameTime)
{
if (gameTime.TotalGameTime - lastBonus > BETWEEN_BONUSES)
{
if (randomize.Next(1, 1000) == 1)
{
bomb.Launch(new Rectangle(randomize.Next
(0, game.GraphicsDevice.Viewport.Width), 10, 1, 1), gameTime);
lastBonus = gameTime.TotalGameTime;
}
}
base.Update(gameTime);
}