public Position GetSurroundingPosition(Position start, Directions direction)
 {
     Position position;
     switch (direction)
     {
         case Directions.North:
             position = new Position(start.X, start.Y - 1);
             break;
         case Directions.South:
             position = new Position(start.X, start.Y + 1);
             break;
         case Directions.West:
             position = new Position(start.X - 1, start.Y);
             break;
         case Directions.East:
             position = new Position(start.X + 1, start.Y);
             break;
         case Directions.NorthEast:
             position = new Position(start.X + 1, start.Y - 1);
             break;
         case Directions.NorthWest:
             position = new Position(start.X - 1, start.Y - 1);
             break;
         case Directions.SouthWest:
             position = new Position(start.X - 1, start.Y + 1);
             break;
         default:
             position = new Position(start.X + 1, start.Y + 1);
             break;
     }
     return position;
 }
 public List<PositionedTile> GetSurroundingTiles(Position start, List<PositionedTile> tiles)
 {
     return (from direction in Enum.GetValues(typeof (Directions)).Cast<Directions>()
             select GetSurroundingPosition(start, direction)
             into p
             where IsValid(p)
             select GetTile(p, tiles)).ToList();
 }
 public bool IsValid(Position position)
 {
     if (position.X < 0 || position.Y < 0) return false;
     if (position.X > _boardSize - 1 || position.Y > _boardSize - 1) return false;
     return true;
 }
 public PositionedTile GetTile(Position position, List<PositionedTile> tiles)
 {
     return tiles[_positionFinder.GetIndex(position)];
 }