public EnemyManager(
            Texture2D texture,
            Rectangle initialFrame,
            int frameCount,
            PlayerManager playerManager,
            Rectangle screenBounds)
        {
            this.texture = texture;
            this.initialFrame = initialFrame;
            this.frameCount = frameCount;
            this.playerManager = playerManager;

            EnemyShotManager = new ShotManager(
                texture,
                new Rectangle(0, 300, 5, 5),
                4,
                2,
                150f,
                screenBounds);

            setUpWaypoints();
        }
        /// <summary>
        /// LoadContent will be called once per game and is the place to load
        /// all of your content.
        /// </summary>
        protected override void LoadContent()
        {
            // Create a new SpriteBatch, which can be used to draw textures.
            spriteBatch = new SpriteBatch(GraphicsDevice);

            titleScreen = Content.Load<Texture2D>(@"Textures/TitleScreen");
            spriteSheet = Content.Load<Texture2D>(@"Textures/SpriteSheet");

            starField = new StarField(
                this.Window.ClientBounds.Width,
                this.Window.ClientBounds.Height,
                200,
                new Vector2(0, 30f),
                spriteSheet,
                new Rectangle(0, 450, 2, 2));

            asteroidManager = new AsteroidManager(
                10,
                spriteSheet,
                new Rectangle(0, 0, 50, 50),
                20,
                this.Window.ClientBounds.Width,
                this.Window.ClientBounds.Height);

            playerManager = new PlayerManager(
                spriteSheet,
                new Rectangle(0, 150, 50, 50),
                3,
                new Rectangle(
                    0,
                    0,
                    this.Window.ClientBounds.Width,
                    this.Window.ClientBounds.Height));

            enemyManager = new EnemyManager(
                spriteSheet,
                new Rectangle(0,200,50,50),
                6,
                playerManager,
                new Rectangle(
                    0,
                    0,
                    this.Window.ClientBounds.Width,
                    this.Window.ClientBounds.Height));

            // TODO: use this.Content to load your game content here
        }