除非我调用pygame.event.get()，否则pygame不会变色 [英] pygame does not blit unless I call pygame.event.get()

问题描述

将我的头撞到显示器上两个小时后，我意识到:

After crashing my head against the monitor for 2 hours I realised that:

display.blit(mypic, posx, posy)
pygame.display.update()

除非我打电话给我，否则

就是行不通的(即不会在屏幕上显示任何内容).

would just not work (i.e. wouldn't blit anything on the screen) unless I call:

pygame.event.get()

这是地球上最怪异的虫子，还是我错过了什么?

Is this the weirdest bug on earth, or am I missing something?

我正在python 2.7上运行pygame，mac os high sierra， 是的，如果这是由于pygame和mac os之间的不兼容，那么我将最不惊讶.

I'm running pygame on python 2.7, mac os high sierra, and yes I would be the least surprised if this was due to the goddam incompatibility between pygame and mac os.

关于这里出了什么问题的任何提示吗?

示例代码:

import pygame
winWidth = 800
winHeight = 600
posx = 200; posy = 200
mypic = pygame.image.load("path_to_my_picture.jpg")
COL_BACKGROUND = (255,255,255)

DISPLAYSURF = pygame.display.set_mode((winWidth, winHeight))
pygame.init()
display.fill(COL_BACKGROUND)
display.blit(mypic, posx, posy)

# only including the following line it will blit the picture:
# pygame.event.get()

pygame.display.update()

推荐答案

我不确定100％是否与mac兼容，但是我假设它与Windows相似，如果您不定期调用pygame.event.get()操作系统认为该窗口已停止响应，并且不再更新它.

I'm not 100% sure how it works with mac but I am assuming it is similar to windows in that if you don't call pygame.event.get() regularly the operating system thinks that the window has stopped responding and no longer updates it.

在 pygame.event.pump()下提及在Pygame文档的事件页面中

This is mentioned under pygame.event.pump() in the events page of the Pygame documentation

对于游戏的每一帧，您都需要进行一些通话 到事件队列.这样可以确保您的程序可以在内部进行交互 与操作系统的其余部分.如果您不使用其他 游戏中的事件函数，应调用pygame.event.pump() 允许pygame处理内部动作.

For each frame of your game, you will need to make some sort of call to the event queue. This ensures your program can internally interact with the rest of the operating system. If you are not using other event functions in your game, you should call pygame.event.pump() to allow pygame to handle internal actions.

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