/// <summary>
/// Performs all bullet and player/alien collision detection. Also handles game logic
/// when a hit occurs, such as killing something, adding score, ending the game, etc.
/// </summary>
void CheckHits()
{
if (gameOver)
{
return;
}
for (int i = 0; i < playerBullets.Count; ++i)
{
if (playerBullets[i].IsAlive == false)
{
continue;
}
for (int a = 0; a < aliens.Count; ++a)
{
if (aliens[a].IsAlive == false)
{
continue;
}
if ((playerBullets[i].Position.X >= aliens[a].Position.X && playerBullets[i].Position.X <= aliens[a].Position.X + aliens[a].Width) && (playerBullets[i].Position.Y >= aliens[a].Position.Y && playerBullets[i].Position.Y <= aliens[a].Position.Y + aliens[a].Height))
{
playerBullets[i].IsAlive = false;
aliens[a].IsAlive = false;
hitStreak++;
player.Score += aliens[a].Score * (hitStreak / 5 + 1);
if (player.Score > highScore)
{
highScore = player.Score;
}
if (player.Score > nextLife)
{
player.Lives++;
nextLife += nextLife;
}
levelKillCount--;
if (levelKillCount <= 0)
{
AdvanceLevel();
}
particles.CreateAlienExplosion(new Vector2(aliens[a].Position.X + aliens[a].Width / 2, aliens[a].Position.Y + aliens[a].Height / 2));
alienDied.Play();
}
}
}
if (player.IsAlive == false)
{
return;
}
for (int i = 0; i < alienBullets.Count; ++i)
{
if (alienBullets[i].IsAlive == false)
{
continue;
}
if ((alienBullets[i].Position.X >= player.Position.X + 2 && alienBullets[i].Position.X <= player.Position.X + player.Width - 2) && (alienBullets[i].Position.Y >= player.Position.Y + 2 && alienBullets[i].Position.Y <= player.Position.Y + player.Height))
{
alienBullets[i].IsAlive = false;
player.IsAlive = false;
hitStreak = 0;
player.RespawnTimer = 3.0f;
particles.CreatePlayerExplosion(new Vector2(player.Position.X + player.Width / 2, player.Position.Y + player.Height / 2));
playerDied.Play();
if (player.Lives <= 0)
{
gameOver = true;
}
}
}
}
