/// <summary>
/// Reference page contains links to related conceptual articles.
/// </summary>
/// <param name="gameTime">Time passed since the last call to Update.</param>
protected override void Update(GameTime gameTime)
{
long delta = gameTime.ElapsedGameTime.Milliseconds;
var inputState = new Input(Keyboard.GetState(), GamePad.GetState(PlayerIndex.One));
if (_running)
{
if (inputState.Escape())
{
_running = false;
_menu.SelectedMenuScreen = _menu.MainMenuIndex;
return;
}
_player.Update(GraphicsDevice, inputState, delta);
_lastFire += delta;
if (inputState.Fire())
{
if (_lastFire > _fireTime.Milliseconds)
{
_lastFire = 0;
_shootSound.Play();
AddProjectile();
}
}
UpdateCollisions();
for (int i = _projectiles.Count - 1; i >= 0; i--)
{
_projectiles[i].Update(GraphicsDevice, inputState, delta);
if (_projectiles[i].Active == false)
{
_projectiles.RemoveAt(i);
}
}
for (int i = _explosions.Count - 1; i >= 0; i--)
{
_explosions[i].Update(GraphicsDevice, inputState, delta);
if (_explosions[i].Active == false)
{
_explosions.RemoveAt(i);
}
}
for (int i = _enemies.Count - 1; i >= 0; i--)
{
_enemies[i].Update(GraphicsDevice, inputState, delta);
if (_enemies[i].Active == false)
{
_enemies.RemoveAt(i);
}
else
{
if (_enemies[i].LastFired > _fireTime.Milliseconds)
{
_enemies[i].LastFired = 0;
double angle;
if (_enemies[i].Accurate)
{
angle = Math.Atan2(_player.Position.Y - _enemies[i].Position.Y,
_player.Position.X - _enemies[i].Position.X);
}
else
{
angle = _rand.NextDouble() * MathHelper.TwoPi;
}
Vector2 position = _enemies[i].Position +
new Vector2((float)(32 * Math.Cos(angle)), (float)(32 * Math.Sin(angle)));
var projectile = new Projectile();
projectile.Initialize(GraphicsDevice.Viewport, _projectileTexture, position, angle,
ProjectileMoveSpeed, true);
_projectiles.Add(projectile);
}
}
}
UpdateAsteroids(delta, inputState);
base.Update(gameTime);
}
else
{
_menu.Update(GraphicsDevice, inputState, delta);
}
}
