AIMA.Core.Environment.EightPuzzle.EightPuzzleBoard.moveGapLeft C# (CSharp) Method

	public void moveGapLeft() {
		int gapPos = getGapPosition();
		int x = getXCoord(gapPos);
		int ypos = getYCoord(gapPos);
		if (!(ypos == 0)) {
			int valueOnLeft = getValueAt(x, ypos - 1);
			setValue(x, ypos, valueOnLeft);
			setValue(x, ypos - 1, 0);
		}

	}

            public Object result(Object s, Action a)
            {
                EightPuzzleBoard board = (EightPuzzleBoard)s;

                if (EightPuzzleBoard.UP.Equals(a) &&
                    board.canMoveGap(EightPuzzleBoard.UP))
                {
                    EightPuzzleBoard newBoard = new EightPuzzleBoard(board);
                    newBoard.moveGapUp();
                    return(newBoard);
                }
                else if (EightPuzzleBoard.DOWN.Equals(a) &&
                         board.canMoveGap(EightPuzzleBoard.DOWN))
                {
                    EightPuzzleBoard newBoard = new EightPuzzleBoard(board);
                    newBoard.moveGapDown();
                    return(newBoard);
                }
                else if (EightPuzzleBoard.LEFT.Equals(a) &&
                         board.canMoveGap(EightPuzzleBoard.LEFT))
                {
                    EightPuzzleBoard newBoard = new EightPuzzleBoard(board);
                    newBoard.moveGapLeft();
                    return(newBoard);
                }
                else if (EightPuzzleBoard.RIGHT.Equals(a) &&
                         board.canMoveGap(EightPuzzleBoard.RIGHT))
                {
                    EightPuzzleBoard newBoard = new EightPuzzleBoard(board);
                    newBoard.moveGapRight();
                    return(newBoard);
                }

                // The Action is not understood or is a NoOp
                // the result will be the current state.
                return(s);
            }