Time for action – making the connection

1. Add the PropagateWater() method to the GameBoard class:

     public void PropagateWater(int x, int y, string fromDirection)
     {
         if ((y >= 0) && (y < GameBoardHeight) &&
             (x >= 0) && (x < GameBoardWidth))
         {
             if (boardSquares[x,y].HasConnector(fromDirection) &&
                 !boardSquares[x,y].Suffix.Contains("W"))
             {
                 FillPiece(x, y);
                 WaterTracker.Add(new Vector2(x, y));
                 foreach (string end in
                          boardSquares[x,y].GetOtherEnds(fromDirection))
                     switch (end)
                           {
                         case "Left": PropagateWater(x - 1, y, "Right");
                             break;
                         case "Right": PropagateWater(x + 1, y, "Left");
                             break;
                         case "Top": PropagateWater(x, y - 1, "Bottom");
                             break;
            ...