Time for action – the MapSquare class

1. Add a new class called MapSquare.cs to the "Tile Engine" project.

2. Add the following using directives to the MapSquare class:

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

3. Modify the declaration of the MapSquare class by adding the [Serializable] attribute before the class declaration, and making the class public:

   [Serializable]
   public class MapSquare

4. Add the declarations region to the MapSquare class:

   #region Declarations
   public int[] LayerTiles = new int[3];
   public string CodeValue = "";
   public bool Passable = true;
   #endregion

5. Add a constructor to the MapSquare class:

   #region Constructor
   public MapSquare(
       int background,
       int interactive,
       int foreground,
       string code,
       bool passable)
   {
       LayerTiles[0] = background;
       LayerTiles[1] = interactive;
       LayerTiles[2] = foreground;
       CodeValue = code;
       Passable = passable;
   }
   #endregion

6. Add the TogglePassable() method to the MapSquare class:

   #region Public Methods...