public void CleanTemporaryGameLists()//gameobject lists are cleaned up
{
GameDisplay.Children.Clear();
//lists are updated
EnemyProjectiles = EnemyProjectiles.Except(TemporaryEnemyProjectiles).ToList();
PlayerProjectiles = PlayerProjectiles.Except(TemporaryPlayerProjectiles).ToList();
Ufos = Ufos.Except(TemporaryUfos).ToList();
Walls = Walls.Except(TemporaryWalls).ToList();
Invaders = Invaders.Except(TemporaryInvaders).ToList();
//temporary lists are cleared
TemporaryWalls.Clear();
TemporaryPlayerProjectiles.Clear();
TemporaryInvaders.Clear();
TemporaryEnemyProjectiles.Clear();
TemporaryUfos.Clear();
}
private void CheckplayerProjectileCollisions()//discovers collisions between player projectiles and other gameobjects
{
foreach (PlayerProjectile PlayerProjectile in PlayerProjectiles)
{
foreach (Wall wall in Walls)
{
if (wall.IsHit(PlayerProjectile.X, PlayerProjectile.Y))
{
TemporaryWalls.Add(wall); //removes wall
TemporaryPlayerProjectiles.Add(PlayerProjectile); //removes player projectile
}
}
foreach (Invader invader in Invaders)
{
if (invader.IsHit(PlayerProjectile.X, PlayerProjectile.Y))
{
TemporaryInvaders.Add(invader); //removes invader
TemporaryPlayerProjectiles.Add(PlayerProjectile); //removes player projectile
score = score + 5 + 15 * difficultyIndex; //score for a destroyed invader
}
}
foreach (Ufo ufo in Ufos)
{
if (ufo.IsHit(PlayerProjectile.X, PlayerProjectile.Y))
{
score += 50;
TemporaryUfos.Add(ufo); //removes UFO
TemporaryPlayerProjectiles.Add(PlayerProjectile); //removes player projectile
}
}
if (PlayerProjectile.Y < 0)
{
TemporaryPlayerProjectiles.Add(PlayerProjectile);//removes player projectile
}
}
}
