Time for action – water in the pipes

1. Add a method to the GameBoard class to clear the water marker from all pieces:

   Public Sub ResetWater()
     Dim x, y As Integer
     For x = 0 To GameBoardWidth
       For y = 0 To GameBoardHeight
         boardSquares(x, y).RemoveSufix("W")
       Next
     Next
   End Sub

2. Add a method to the GameBoard class to fill an individual piece with water:

   Public Sub FillPiece(x As Integer, y As Integer)
     boardSquares(x, y).AddSuffix("W")
   End Sub

What just happened?

The ResetWater() method simply loops through each item in the boardSquares array and removes the W suffix from the GamePiece. Similarly, to fill a piece with water, the FillPiece() method adds the W suffix to the GamePiece. Recall that by having a W suffix, the GetSourceRect() method of GamePiece shifts the source rectangle one tile to the right on the sprite sheet, returning the image for a pipe filled with water, instead of an empty pipe.

Propagating water

Now that we can fill individual pipes with water, we can write the...