XNA 4.0 Game Development by Example Beginner's Guide

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( ...