go.py 文件源码

def symmetries(self):
        """returns a list of 8 GameState objects:
        all reflections and rotations of the current board

        does not check for duplicates
        """
        copies = [self.copy() for i in range(8)]
        # copies[0] is the original.
        # rotate CCW 90
        copies[1].board = np.rot90(self.board,1)
        # rotate 180
        copies[2].board = np.rot90(self.board,2)
        # rotate CCW 270
        copies[3].board = np.rot90(self.board,3)
        # mirror left-right
        copies[4].board = np.fliplr(self.board)
        # mirror up-down
        copies[5].board = np.flipud(self.board)
        # mirror \ diagonal
        copies[6].board = np.transpose(self.board)
        # mirror / diagonal (equivalently: rotate 90 CCW then flip LR)
        copies[7].board = np.fliplr(copies[1].board)
        return copies