/// <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()
{
// Create a new SpriteBatch, which can be used to draw textures.
Type[] types = new Type[] {typeof(Enemy),typeof(Expires),typeof(Health),typeof(SpatialForm),typeof(Transform),typeof(Velocity),typeof(Weapon)};
spriteBatch = new SpriteBatch(GraphicsDevice);
world = new EntityWorld();
font = Content.Load<SpriteFont>("myFont");
var systemManager = world.SystemManager;
world.SetEntityTemplate("ShipExplosion", new ShipExplosionTemplate());
world.SetEntityTemplate("BulletExplosion", new BulletExplosionTemplate());
world.SetEntityTemplate("Missile", new MissileTemplate());
world.SetEntityTemplate("EnemyShip", new EnemyShipTemplate());
renderSystem = systemManager.SetSystem(new RenderSystem(GraphicsDevice,spriteBatch,Content),ExecutionType.Draw);
hudRenderSystem = systemManager.SetSystem(new HudRenderSystem(spriteBatch, font), ExecutionType.Draw);
controlSystem = systemManager.SetSystem(new MovementSystem(spriteBatch), ExecutionType.Update,1);
movementSystem = systemManager.SetSystem(new PlayerShipControlSystem(spriteBatch),ExecutionType.Update);
enemyShooterSystem = systemManager.SetSystem(new EnemyShipMovementSystem(spriteBatch), ExecutionType.Update,1);
enemyShipMovementSystem = systemManager.SetSystem(new EnemyShooterSystem(), ExecutionType.Update);
collisionSystem = systemManager.SetSystem(new CollisionSystem(), ExecutionType.Update,1);
healthBarRenderSystem = systemManager.SetSystem(new HealthBarRenderSystem(spriteBatch, font), ExecutionType.Draw);
enemySpawnSystem = systemManager.SetSystem(new EnemySpawnSystem(500, spriteBatch), ExecutionType.Update);
expirationSystem = systemManager.SetSystem(new ExpirationSystem(), ExecutionType.Update);
systemManager.InitializeAll();
InitPlayerShip();
InitEnemyShips();
base.Initialize();
}