如何修复鼠标运动和碰撞点意外结果

Question

我正在做一个小的2D游戏，以学习python和pygame。我制作了一个菜单，上面有 2 个按钮(播放和退出(。播放按钮开始游戏 et 退出按钮离开游戏。

现在我想在鼠标经过按钮时显示一个红色圆圈。我正在使用MOUSEMOTION和collidepoint。

代码正在工作，当我将鼠标放在按钮上时会显示一个红色圆圈，但是当我将鼠标放在窗口的其他位置时，红色圆圈仍然存在。

def menu():
    global Font, Xplay, Xquit, Yplay, Yquit, X_rect_play, Y_rect_play, X_rect_quit, Y_rect_quit, done, QUIT1, pos_quit, BLACK, WHITE, RECT_QUIT, RECT_PLAY, pos_play
    pygame.font.init()
    circle_play = False
    circle_quit = False
    while not done:
        screen.fill(BLACK)      
        RECT_QUIT = pygame.draw.rect(screen, WHITE, (X_rect_quit,Y_rect_quit,250,50))
        RECT_PLAY = pygame.draw.rect(screen, WHITE, (X_rect_play, Y_rect_play,250,50))
        pos_play = (325,166)
        PLAY1 = Font.render("PLAY", True, BLACK)
        screen.blit(PLAY1,pos_play)
        screen.blit(QUIT1, pos_quit)
        if circle_play:
            pygame.draw.circle(screen, RED, (310,174), 13)
        if circle_quit:
            pygame.draw.circle(screen, RED, (310,274), 13)
        pygame.display.update()
        for event in pygame.event.get():
            if event.type == MOUSEMOTION:
                circle_play = RECT_PLAY.collidepoint(pygame.mouse.get_pos())
                circle_quit = RECT_QUIT.collidepoint(pygame.mouse.get_pos())

我希望在移动鼠标时删除红色圆圈。

我该如何解决这个问题？

感谢您的帮助。

Answer 1

只需在 while 循环中移动绘制按钮的代码，并确保每帧都清除屏幕。

要修复圆圈自动消失的问题，您需要创建一个变量来跟踪圆圈是否可见。

def menu():
    global Font, Xplay, Xquit, Yplay, Yquit, X_rect_play, Y_rect_play, X_rect_quit, Y_rect_quit, done, QUIT1, pos_quit
    circle_play = False  # will be true when circle on the play button will be visible
    circle_quit = False
    while not done:
        screen.fill(BLACK)
        RECT_PLAY = pygame.draw.rect(screen, WHITE, (X_rect_play, Y_rect_play,250,50))
        pos_play = (325,166)
        PLAY1 = Font.render("PLAY", True, BLACK)
        screen.blit(PLAY1,pos_play)
        screen.blit(QUIT1, pos_quit)
        if circle_play:
            pygame.draw.circle(screen, RED, (310,174), 13)
        if circle_quit:
            pygame.draw.circle(screen, RED, (310,274), 13)
        pygame.display.update()
        for event in pygame.event.get():
            if event.type == MOUSEMOTION:
                circle_play = RECT_PLAY.collidepoint(pygame.mouse.get_pos())
                circle_quit = RECT_QUIT.collidepoint(pygame.mouse.get_pos())
            ...