/// <summary>
/// Called when a collision is detected between an AlienSprite and a Projectile from the
/// LaserFactory.
/// </summary>
/// <param name="killedAlien">The killed Alien from which the collision was detected on.</param>
private void killAlien(DrawableGameComponent killedAlien, int points)
{
AlienSprite alien = ((AlienSprite)killedAlien);
// remove a hit point from alien
alien.SetHitPoints(alien.GetHitPoints() - 1);
if (alien.GetHitPoints() <= 0)
{
alien.SetAlienState(AlienState.INACTIVE);
alienKillSoundInstance.Play();
killedCount++;
//Increases speed of squad once a certain number are killed
if ((killedCount % 8) == 0)
{
Alien.IncreaseSpeed();
}
//Resets squad if all are killed
if (killedCount == alienSquad.Length)
{
level++;
alienLevel++;
resetAlienSquad();
}
//Spawns mothership once a certain number are killed
if (killedCount == (alienSquad.Length / 2))
{
mothershipSprite.RandomizeMothershipSpawn();
mothershipSprite.SetAlienState(AlienState.ACTIVE);
mothershipSprite.SetSpawnMother(true);
}
}
else
{
// check what type of alien was hit, change texture to a hit sprite alien of that type
if (alien.GetAlienType() == AlienType.SPACESHIP)
{
alien.SetTexture(hitAlienTexture1);
}
else if (alien.GetAlienType() == AlienType.BUG)
{
alien.SetTexture(hitAlienTexture2);
}
else if (alien.GetAlienType() == AlienType.FLYINGSAUCER)
{
alien.SetTexture(hitAlienTexture3);
}
}
}
