//########################################################################
//# Event Handlers
/// <summary>
/// Tick event handler of animation timer.
/// Moves all sprites by calling the Move() method.
/// </summary>
private void AnimationTimerTick(object sender, EventArgs e)
{
// Move all bombs.
// Also remove bombs that are off screen, hence the backwards loop.
for (int index = _bombs.Count - 1; index >= 0; index--)
{
Bomb bomb = _bombs[index];
if (bomb.Y >= Height)
{
_bombs.RemoveAt(index);
}
else
{
bomb.Move();
if (bomb.CollidedWith(_ship))
{
Win("Alien");
}
}
}
// Move the alien
_alien.Move();
// Ask the alien whether it wants to drop another bomb
Bomb newBomb = _alien.LaunchBomb();
if (newBomb != null)
{
_bombs.Add(newBomb);
}
// Force repaint. This triggers the GamePaint() handler below.
Refresh();
}