/// <summary>
/// Allows the game to perform any initialization it needs to before starting to run.
/// This is where it can query for any required services and load any non-graphic
/// related content. Calling base.Initialize will enumerate through any components
/// and initialize them as well.
/// </summary>
protected override void Initialize()
{
// TODO: Add your initialization logic here
player = new Player();
bgLayer1 = new ParallaxingBackground();
bgLayer2 = new ParallaxingBackground();
enemies = new List<Enemy>();
ui = new UI();
previousSpawnTime = TimeSpan.Zero;
enemySpawnTime = TimeSpan.FromSeconds(1.0f);
explosions = new List<Animation>();
random = new Random();
projectiles = new List<Projectile>();
fireTime = TimeSpan.FromSeconds(.15f);
base.Initialize();
}