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嗨!我正在制作一个象棋引擎,并且在make/unmake方法中遇到了一些问题。国际象棋编程make and unmake move
我有一个Piece类,它包含了棋子类型(pawn,queen等等)和棋子的位置,以及一个Move类,它包含了目标棋子,被移动棋子和被捕获棋子。
问题是,当我调用makeMove方法时,它将片段的位置更改为Piece对象内的方形目标。但是现在,我无法用Move对象调用unmakeMove,因为现在我没有关于移动来自哪里的信息,因为我刚刚更改了该部分的位置。你将如何解决这个问题?
非常感谢!
class Board:
# Previous methods omitted.
def makeMove(self, move, player):
""" Makes a move on the board and changes Piece object. Returns None. """
self.moved_piece = move.getPiece()
self.captured_piece = move.getCapturedPiece(self)
if self.captured_piece: # Remove captured piece from player's piece dict.
player.removePiece(self.captured_piece)
self.setPiece(move.getTargetSquare(), self.moved_piece) # Set moved piece on target square.
self.setPiece(self.moved_piece.getPosition(), EMPTY) # Make the origin square empty.
self.moved_piece.changePosition(move.getTargetSquare()) # Change piece object's position.
def unmakeMove(self, move, player):
""" Unmakes a move. Returns None. """
self.moved_piece = move.getPiece()
self.captured_piece = move.getCapturedPiece(self)
self.setPiece(self.moved_piece.getPosition(), captured_piece) # Set captured piece or empty square to target square.
# Set piece to original square. HOW !?
你应该保留一个移动列表。这样,你可以将最后一步移出堆栈,做相反的事情,而你是金。你可能需要一个'reverseMove'方法和一个'uncapturePiece'方法。 – 2012-08-08 21:09:01
阅读[纪念图案](http://en.wikipedia.org/wiki/Memento_pattern) – 2012-08-08 21:10:05
@FredLarson:良好的联系。我以前不知道这一点。 – 2012-08-08 21:12:25