Time for action – enemy AI methods

1. Add movement-related methods to the Enemy class:

   #region AI Methods
   private Vector2 determineMoveDirection()
   {
       if (reachedTargetSquare())
       {
           currentTargetSquare = getNewTargetSquare();
       }
   
       Vector2 squareCenter = TileMap.GetSquareCenter(
           currentTargetSquare);
   
       return squareCenter - EnemyBase.WorldCenter;
   }
   
   private bool reachedTargetSquare()
   {
       return (
           Vector2.Distance(
               EnemyBase.WorldCenter,
               TileMap.GetSquareCenter(currentTargetSquare))
           <= 2);
   }
   
   private Vector2 getNewTargetSquare()
   {
       List<Vector2> path = PathFinder.FindPath(
           TileMap.GetSquareAtPixel(EnemyBase.WorldCenter),
           TileMap.GetSquareAtPixel(Player.BaseSprite.WorldCenter));
   
       if (path.Count > 1)
       {
           return new Vector2(path[1].X, path[1].Y);
       }
       else
       {
           return TileMap.GetSquareAtPixel(
               Player.BaseSprite.WorldCenter);
       }
   }
   #endregion

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