Time for action – the GameOver screen

1. 1. Add a new class file called GameOverScreen.cs to the Screens folder of the Mars Runner project.

2. 2. Add the following using directives at the beginning of the GameOverScreen class file:

   using Microsoft.Xna.Framework;
   using Microsoft.Xna.Framework.Content;
   using Microsoft.Xna.Framework.Graphics;

3. 3. Modify the namespace declaration for the class file by removing .Screens from the end of the namespace. The namespace line should now read as follows:

   namespace Mars_Runner

4. 4. Modify the declaration of the GameOverScreen class to inherit from the GameScreen class. The new declaration line should read as follows:

   class GameOverScreen : GameScreen

5. 5. Add fields to the GameOverScreen class as follows:

   #region Fields
   private float displayTimer = 8f;
   private float displayCounter = 0f;
   Texture2D blank;
   SpriteFont font;
   ContentManager content;
   #endregion

6. 6. Override the LoadContent() method in the GameOverScreen class as follows:

   #region Initialization
   public override void...