Time for action – the PathNode class

1. Add a new class called PathNode to the Robot Rampage project.

2. Add the following using directive to the top of the class file:

   using Microsoft.Xna.Framework;

3. Add declarations to the PathNode class:

   #region Declarations
   public PathNode ParentNode;
   public PathNode EndNode;
   private Vector2 gridLocation;
   public float TotalCost;
   public float DirectCost;
   #endregion

4. Add properties to the PathNode class:

   #region Properties
   public Vector2 GridLocation
   {
       get { return gridLocation; }
       set {
           gridLocation = new Vector2(
               (float)MathHelper.Clamp(value.X,0f,(float)TileMap.MapWidth),
               (float)MathHelper.Clamp(value.Y,0f,(float)TileMap.MapHeight));
       }
   }
   
   public int GridX
   {
       get { return (int)gridLocation.X; }
   }
   
   public int GridY
   {
       get { return (int)gridLocation.Y; }
   }
   #endregion
   

5. Add a constructor to the PathNode class:

   #region Constructor
   public PathNode(
       PathNode parentNode,
       PathNode endNode,
       Vector2 gridLocation,
     ...