XNA 4.0 Game Development by Example Beginner's Guide

Time for action – updating and displaying ScoreZooms

1. Add a Queue object to the Game1 class to hold active ScoreZooms:

   Queue<ScoreZoom> ScoreZooms = new Queue<ScoreZoom>();

2. Add a new helper method to the Game1 class to update the ScoreZooms queue:

   private void UpdateScoreZooms()
   {
       int dequeueCounter = 0;
       foreach (ScoreZoom zoom in ScoreZooms)
       {
           zoom.Update();
           if (zoom.IsCompleted)
               dequeueCounter++;
       }
       for (int d = 0; d < dequeueCounter; d++)
           ScoreZooms.Dequeue();
   }

3. In the Update() method, inside the case section for GameState.Playing, add the call to update any active ScoreZooms. This can be placed right before the case's break; statement:

   UpdateScoreZooms();

4. Add the following to the CheckScoringChain() method to create a ScoreZoom when the player scores. ...