public override void Update(GameTime gameTime)
{
// if gameover wait for key press and then restart the game
if (PlayerStatus.IsGameOver)
{
timeUntilRespawn = 0.25f;
if (Input.WasKeyPressed(Keys.Enter) || Input.WasButtonPressed(Buttons.Start))
{
PlayerStatus.Reset();
}
return;
}
if (IsDead)
{
// wait for time to respawn
timeUntilRespawn -= (float)gameTime.ElapsedGameTime.TotalSeconds;
if (timeUntilRespawn <= 0)
{
}
return;
}
// update velocity and position
velocity += speed * Input.GetMovementDirection();
position += velocity * (float)gameTime.ElapsedGameTime.TotalSeconds;
// make sure the ship is always in the screen bounds
position = Vector2.Clamp(position, Size / 2, GameRoot.ScreenSize - Size / 2);
// shoot a bullet in the aim direction when the cooldown is also finnished
var aim = Input.GetAimDirection();
if (aim.LengthSquared() > 0 && cooldownRemaining <= 0)
{
cooldownRemaining = cooldownTime;
float aimAngle = aim.ToAngle();
Quaternion aimQuat = Quaternion.CreateFromYawPitchRoll(0, 0, aimAngle);
float randomSpread = rand.NextFloat(-0.04f, 0.04f) + rand.NextFloat(-0.04f, 0.04f);
Vector2 vel = MathUtil.FromPolar(aimAngle + randomSpread, bulletSpeed);
// spawn two bullets infront of the player. one on the left side and other on the right
Vector2 offset = Vector2.Transform(new Vector2(25, -8), aimQuat);
EntityManager.Add(new Bullet(position + offset, vel));
offset = Vector2.Transform(new Vector2(25, 8), aimQuat);
EntityManager.Add(new Bullet(position + offset, vel));
Sound.Shot.Play(0.2f, rand.NextFloat(-0.2f, 0.2f), 0);
}
// make the ship look in the direction of player
if (aim.LengthSquared() > 0)
{
orientation = aim.ToAngle();
}
if (cooldownRemaining > 0)
{
cooldownRemaining -= (float)gameTime.ElapsedGameTime.TotalSeconds;
}
MakeExhaustFire();
velocity = Vector2.Zero;
}
static void HandleCollisions()
{
// check collision for every enemy with every other enemy in the list
for (int i = 0; i < enemies.Count; i++)
{
// starting from i as previous enemies have already checked for collision with the enemy at i
// therefore no need to check again. +1 because we donot want to check collisions with self
for (int j = i + 1; j < enemies.Count; j++)
{
if (IsColliding(enemies[i], enemies[j]))
{
enemies [i].HandleCollision(enemies [j]);
enemies [j].HandleCollision(enemies [i]);
}
}
}
// check collision for every bullet with every enemy
for (int i = 0; i < enemies.Count; i++)
{
for (int j = 0; j < bullets.Count; j++)
{
if (IsColliding(enemies [i], bullets [j]))
{
enemies [i].WasShot();
PlayerStatus.AddPoints(enemies [i].PointValue);
PlayerStatus.IncreaseMultiplier();
bullets [j].isExpired = true;
}
}
}
// check collision of every enemy with the player
for (int i = 0; i < enemies.Count; i++)
{
if (enemies[i].IsActive && IsColliding(enemies [i], PlayerShip.Instance))
{
KillPlayer();
break;
}
}
// check collision of all the blackholes with enemies, bullets and player
// bullets cause damage to the blackhole while player and enemies are killed
for (int i = 0; i < blackHoles.Count; i++)
{
for (int j = 0; j < enemies.Count; j++)
{
if (enemies [j].IsActive && IsColliding(blackHoles [i], enemies[j]))
{
enemies [j].WasShot();
}
}
for (int j = 0; j < bullets.Count; j++)
{
if (IsColliding(blackHoles[i], bullets[j]))
{
bullets [j].isExpired = true;
blackHoles [i].WasShot();
}
}
if (IsColliding(PlayerShip.Instance, blackHoles[i]))
{
KillPlayer();
break;
}
}
}
