/// <summary>
/// Returns an instance of a usable alien bullet. Prefers reusing an existing (dead)
/// bullet over creating a new instance.
/// </summary>
/// <returns>A bullet ready to place into the world.</returns>
Bullet CreateAlienBullet()
{
Bullet b = null;
for (int i = 0; i < alienBullets.Count; ++i)
{
if (alienBullets[i].IsAlive == false)
{
b = alienBullets[i];
break;
}
}
if (b == null)
{
b = new Bullet();
alienBullets.Add(b);
}
b.IsAlive = true;
return b;
}
/// <summary>
/// Returns an instance of a usable player bullet. Prefers reusing an existing (dead)
/// bullet over creating a new instance.
/// </summary>
/// <returns>A bullet ready to place into the world.</returns>
Bullet CreatePlayerBullet()
{
Bullet b = null;
for (int i = 0; i < playerBullets.Count; ++i)
{
if (playerBullets[i].IsAlive == false)
{
b = playerBullets[i];
break;
}
}
if (b == null)
{
b = new Bullet();
playerBullets.Add(b);
}
b.IsAlive = true;
return b;
}
public void Update(GameTime gameTime, GraphicsDeviceManager graphics)
{
if (!alive)
{
if (gameTime.TotalGameTime.CompareTo(deadTime + respawnTime) == 1)
{
alive = true;
}
}
else
{
Vector2 leftStick = GamePad.GetState(playerIndex).ThumbSticks.Left;
Vector2 rightStick = GamePad.GetState(playerIndex).ThumbSticks.Right;
position += new Vector2(leftStick.X * 5, -leftStick.Y * 5);
if (rightStick != new Vector2(0,0))
{
if (lastShot == null || gameTime.TotalGameTime.CompareTo(lastShot + reload) == 1)
{
Bullet b = new Bullet(graphics, position.X, position.Y, this, spriteBatch, rightStick);
lastShot = gameTime.TotalGameTime;
bullets.Add(b);
shotFX.Play();
}
}
}
if ((position.Y + size.Y) > graphics.PreferredBackBufferHeight)
{
position.Y = (graphics.PreferredBackBufferHeight - size.Y);
}
else if (position.Y < 0)
{
position.Y = 0;
}
if ((position.X + size.X) > graphics.PreferredBackBufferWidth)
{
position.X = (graphics.PreferredBackBufferWidth - size.X);
}
else if (position.X < 0)
{
position.X = 0;
}
foreach (Bullet b in bullets)
{
if (b.GetX > graphics.PreferredBackBufferWidth || b.GetX < 0 || b.GetY > graphics.PreferredBackBufferHeight || b.GetY < 0)
{
bullets.Remove(b);
Hit2FX.Play();
break;
}
}
foreach (Bullet b in bullets)
{
b.Update(gameTime);
}
}
