Question

所以我正在开发一个使用Pygame的游戏并试图抽象掉很多代码。但在这个过程中，我遇到了一些奇怪的错误。也就是说，当我运行main.py时，我得到了这个痕迹：

>>> 
initializing pygame...
initalizing screen...
initializing background...
<Surface(Dead Display)> #Here I print out the background instance
Traceback (most recent call last):
  File "C:\Users\Ceasar\Desktop\pytanks\main.py", line 19, in <module>
    background = Background(screen, BG_COLOR)
  File "C:\Users\Ceasar\Desktop\pytanks\background.py", line 8, in __init__
    self.fill(color)
error: display Surface quit

我想这与我在主要用于管理屏幕的上下文有关。

#main.py
import math
import sys

import pygame
from pygame.locals import *

...

from screen import controlled_screen
from background import Background

BATTLEFIELD_SIZE = (800, 600)
BG_COLOR = 100, 0, 0
FRAMES_PER_SECOND = 20

with controlled_screen(BATTLEFIELD_SIZE) as screen:
    background = Background(screen, BG_COLOR)

    ...

#screen.py
import pygame.display
import os

#The next line centers the screen
os.environ['SDL_VIDEO_CENTERED'] = '1'

class controlled_screen:
    def __init__(self, size):
        self.size = size

    def __enter__(self):
        print "initializing pygame..."
        pygame.init()
        print "initalizing screen..."
        return pygame.display.set_mode(self.size)

    def __exit__(self, type, value, traceback):
        pygame.quit()

#background.py
import pygame

class Background(pygame.Surface):
def __init__(self, screen, color):
    print "initializing background..."
    print screen
    super(pygame.Surface, self).__init__(screen.get_width(),
                                         screen.get_height())
    print self
    self.fill(color)
    self = self.convert() 
    screen.blit(self, (0, 0))

有关导致错误的原因的任何想法吗？

Answer 1

从技术上来说，这不是我的答案，但问题是Surface不能用Python的超级扩展。相反，它应该被称为Python旧样式类，如下所示：

class ExtendedSurface(pygame.Surface):
   def __init__(self, string):
       pygame.Surface.__init__(self, (100, 100))
       self.fill((220,22,22))
       # ...

消息来源：http://archives.seul.org/pygame/users/Jul-2009/msg00211.html

Answer 2

我还试图将pygame.Surface子类化，因为我希望能够为其添加属性。以下完成。我希望它能帮助未来的人们。

必须调用pygame.display.set_mode（），因为它会包含所有pygame.video内容。似乎pygame.display是最终被绘制到屏幕的表面。因此我们需要将我们创建的任何表面blit到pygame.display.set_mode（）的返回值（这只是另一个pygame.Surface对象）。

import pygame
from pygame.locals import *

pygame.init()
SCREEN_SIZE = (800, 600)

font = pygame.font.SysFont('exocet', 16)

class Screen(pygame.Surface):

    def __init__(self):

        pygame.Surface.__init__(self, SCREEN_SIZE)
        self.screen = pygame.display.set_mode((SCREEN_SIZE))
        self.text = "ella_rox"

My_Screen = Screen()        

text_surface = font.render(My_Screen.text, 1, (155, 0, 0))

while True:
    My_Screen.fill((255, 255, 255))
    My_Screen.blit(text_surface, (50, 50))
    My_Screen.screen.blit(My_Screen, (0, 0))
    pygame.display.update()

Pygame：<surface :( dead =“”display）=“”>和Python的“with statement”</surface：>

2 个答案: