Pygame.display.update() 不会在 while 循环的每次迭代中更新

Question

我正在使用 PyGame 创建一个西洋跳棋游戏，但在每个玩家移动后我都遇到了屏幕更新问题。本质上，我使用了一个名为“board”的矩阵，它是屏幕上所有位置的底层数据结构。每次有人移动时，棋盘矩阵都会更新并使用 draw_board() 显示在屏幕上。屏幕应该在 while 循环的每次迭代后更新，但由于某种原因，它只有在两个玩家都移动后才会改变（while 循环的两次迭代）。我一直试图解决这个问题几个小时，但无法弄清楚。这是我的代码。抱歉，如果不清楚或有太多内容，我不知道还能如何捕捉整个问题。

board = matrix of 0 (empty space), 1 (red piece), 2 (blue piece) 

def draw_board(board):
    '''
    Updates the position of the pieces on the board after every move, by copying the board array 
    '''
    draw_background() # we must make the board blank before drawing the pieces again, or else the old positions will remain drawn 
    screen = pygame.display.get_surface()
    radius = 20
    i = 0
    for row in board:
        j = 0
        for space in row:
            if space == 1:
                pygame.draw.circle(screen, red, getPixels(j,i), radius)
            elif space == 2:
                pygame.draw.circle(screen, blue, getPixels(j,i), radius)
            j+=1
        i+=1

while True:       
        # human's turn
        if game.turn == 'red':
            awaiting_red = True
            while awaiting_red:
                for event in pygame.event.get(): 
                    if event.type == pygame.QUIT: # if window close button clicked then leave game loop
                        break
                        
                    if event.type == pygame.MOUSEBUTTONDOWN and second_click == False: # click piece to move 
                        # some code removed here to select a piece
                        second_click = True
                              
                    elif event.type == pygame.MOUSEBUTTONDOWN and second_click == True: # click new position for piece 
                        # some code removed here to select a new position           
                        my_color = board[piece_selected.sprite.y_pos][piece_selected.sprite.x_pos]
                        board[piece_selected.sprite.y_pos][piece_selected.sprite.x_pos] = 0
                        board[space_selected.sprite.y_pos][space_selected.sprite.x_pos] = my_color
                        second_click = False
                        awaiting_red = False
                        
        # computer's turn
        elif game.turn == 'blue':
            move = game.get_move(board)

            # updating the board matrix 
            for i in range(8): # x position
                for j in range(8): # y position
                    new_space = move[0][j][i]
                    board[j][i] = new_space

        # for some reason the screen doesn't update until after both players have made moves?? can't figure out how to fix this 
        draw_board(board)
        pygame.display.update()
        game.change_turn()
        
    pygame.quit()

感谢任何帮助。谢谢！

Answer 1

这发生在我尝试创建原始 Countdown 应用程序的精确副本时。这是因为我在循环中到处使用time.sleep。所以我通过在time.sleep 之前和之后更新屏幕来修复它，并且尽可能地更新它。这样做也可能会修复您的程序。