/// <summary>
/// Protected method that fires the collision event.
/// </summary>
/// <param name="killedAlien">Alien that was hit by a laser.</param>
/// <param name="points">Points received when alien is killed</param>
protected void onAlienCollision(AlienSprite killedAlien, int points)
{
if (AlienCollision != null)
{
AlienCollision(killedAlien, points);
}
}
/// <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);
}
}
}
/// <summary>
/// LoadContent will be called once per game and is the place to load
/// all of your content.
/// </summary>
protected override void LoadContent()
{
alienWidth = game.Content.Load <Texture2D>("spaceship1").Width;
alienHeight = game.Content.Load <Texture2D>("spaceship1").Height;
alienKillSound = game.Content.Load <SoundEffect>("alienKillSound");
alienKillSoundInstance = alienKillSound.CreateInstance();
// Determines the graphical image that the Alien will take
for (int ctr = 0; ctr < alienSquad.GetLength(1); ctr++)
{
alienSquad[0, ctr] = new AlienSprite(game, alienTexture1);
alienSquad[0, ctr].SetAlienType(AlienType.SPACESHIP);
alienSquad[0, ctr].Initialize();
alienSquad[1, ctr] = new AlienSprite(game, alienTexture2);
alienSquad[1, ctr].SetAlienType(AlienType.BUG);
alienSquad[1, ctr].Initialize();
alienSquad[2, ctr] = new AlienSprite(game, alienTexture3);
alienSquad[2, ctr].SetAlienType(AlienType.FLYINGSAUCER);
alienSquad[2, ctr].Initialize();
}
drawAlienSquad();
base.LoadContent();
}
