尝试使用 pygame.display.update 在 pygame 中显示 png 文件，它显示不到一秒钟然后消失. [英] Trying to display a png file in pygame using pygame.display.update, and it shows for less than a second then disappears.

问题描述

图片是一张扑克牌.我们使用的是 pygame 4.5 社区版和 pycharm 2.6.9，因为 2.7 不支持 pygame(这是一所学校).代码如下:

The image is a playing card. We are using pygame 4.5 community edition and pycharm 2.6.9 because 2.7 does not support pygame (this is a school). Here is the code:

import pygame
pygame.init()
picture=pygame.image.load("cards/S01.png")
pygame.display.set_mode(picture.get_size())
main_surface = pygame.display.get_surface()
main_surface.blit(picture, (0,0))
pygame.display.update()

为什么窗口消失了?

推荐答案

问题是，在你用 pygame.display.update() 更新屏幕后，你什么都不做，你的程序只是结束.pygame.display.update() 不会阻塞.

The problem is, after you update the screen with pygame.display.update(), you do nothing, and your program simply ends. pygame.display.update() does not block.

您需要通常称为主循环的东西.这是一个简单的事件处理示例:

You need what is usually called a main loop. Here's a simple example with event handling:

import pygame
pygame.init()
picture = pygame.image.load("cards/S01.png")

# display.set_mode already returns the screen surface
screen = pygame.display.set_mode(picture.get_size())

# a simple flag to show if the application is running
# there are other ways to do this, of course
running = True
while running:

    # it's important to get all events from the 
    # event queue; otherwise it may get stuck
    for e in pygame.event.get():
        # if there's a QUIT event (someone wants to close the window)
        # then set the running flag to False so the while loop ends
        if e.type == pygame.QUIT:
            running = False

    # draw stuff
    screen.blit(picture, (0,0))
    pygame.display.update()

这样，您的应用程序就不会，只有在有人关闭窗口时才会这样做.

This way, your application does not, only when someone closes the window.

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