private void HandleCollisions(GameTime gameTime)
{
// see if a player shot hit an enemy
for (int i = 0; i < _playerShots.Count; i++)
{
PlayerShot playerShot = _playerShots[i];
// check the shot and see if it it collided with an enemy
if (playerShot != null && _enemyGroup.HandlePlayerShotCollision(_playerShots[i]))
{
// remove the shot, add the score
_playerShots.RemoveAt(i);
_score += 100;
AudioManager.PlayCue(AudioManager.Cue.Explosion);
}
}
// see if an enemy shot hit the player
if (_player != null && _enemyGroup.HandleEnemyShotCollision(_player))
{
// blow up the player
_playerExplosion = new Explosion();
Vector2 center = _player.Position + (_player.Size / 2.0f);
_playerExplosion.Position = center - (_playerExplosion.Size / 2.0f);
_player = null;
AudioManager.PlayCue(AudioManager.Cue.Explosion);
}
// see if an enemy hit the player directly
if (_player != null && _enemyGroup.HandleEnemyPlayerCollision(_player))
{
// blow up the player
_playerExplosion = new Explosion();
Vector2 center = _player.Position + (_player.Size / 2.0f);
_playerExplosion.Position = center - (_playerExplosion.Size / 2.0f);
_player = null;
AudioManager.PlayCue(AudioManager.Cue.Explosion);
_loseGame = true;
}
// if the player explosion animation is running, update it
if (_playerExplosion != null)
{
// if this is the last frame
if (_playerExplosion.Update(gameTime) && !_loseGame)
{
// remove it
_playerExplosion = null;
// we lose if we have no lives left
if (_lives == 0)
{
_loseGame = true;
}
else
{
// subract 1 life and reset the board
_lives--;
_enemyGroup.Reset();
_playerShots.Clear();
_player = new Player();
_player.Position = new Vector2(AlienAttackGame.ScreenWidth / 2 - _player.Width / 2, AlienAttackGame.ScreenHeight - 100);
}
}
}
}
