Time for action – game over

1. Modify the declaration of the GameStates enum in the Game1 class to include the GameOver state:

   enum GameStates { TitleScreen, Playing, GameOver };

2. Add the following declarations to the Game1 class:

   Vector2 gameOverLocation = new Vector2(200, 260);
   float gameOverTimer;

3. Modify the Update() method of Game1 by adding a new case section for the GameState.GameOver state:

   case GameStates.GameOver:
       gameOverTimer -= (float)gameTime.ElapsedGameTime.TotalSeconds;
       if (gameOverTimer <= 0)
       {
           gameState = GameStates.TitleScreen;
       }
       break;

4. Modify the if statement in the Draw() method of Game1 for the GameState.Playing state from if (gameState == GameStates.Playing) to:

   if ((gameState == GameStates.Playing) ||
       (gameState == GameStates.GameOver))

5. Add a new if statement for the GameState.GameOver state to the Draw() method, right before the call to Base.Draw(gameTime).

   if (gameState == GameStates.GameOver)
   {
       spriteBatch.Begin();
       spriteBatch.DrawString...