Time for action – detecting hits

To detect hits, perform the following steps:

1. 1. To the TankBattlesGame class' declarations area, add the following fields:

   float gameOverTimer = 0.0f;
   float gameOverDelay = 8.0f;
   float impactDistance = 2.5f;

2. 2. In the CreateUIElements() method of the TankBattlesGame class, create a new text block to hold the Game Over message when it should be displayed by adding the following to the end of the method:

   uiElements.Add("gameOverText",
       UIHelper.CreateTextblock("gameOverText", "", 220, 100));

3. 3. Replace the current case GameState.GameOver section of the Update() method with:

   case GameState.GameOver:
       gameOverTimer += (float)gameTime.ElapsedGameTime.TotalSeconds;
       if (gameOverTimer > gameOverDelay)
       {
           UIHelper.SetElementVisibility(
               "gameOverText", 
               false, 
               uiElements);
           gameState = GameState.TitleScreen;
       }
       break;

4. 4. To the CheckForShotImpacts() method inside the if statement and just before...