pygame 实例化后没有绘制任何内容

问题描述

我正在尝试使用 pygame 创建一个 2d 视频游戏。

执行以下代码后：

from ship import Ship
from settings import Settings
import sys
import pygame


class Alien_invasion:
    """class to manage the game"""

    def __init__(self):
        """initialise the game and create game ressources"""
        pygame.init()
        #print("ouzou")
        self.settings=Settings()
        self.screen = pygame.display.set_mode(self.settings.screen_height,self.settings.screen_width)
        
        pygame.display.set_caption("Alien invasion")
        self.ship = Ship(self)
        
    def run_game(self):
        """start the game by calling a main loop"""
        while True:
            print("izann")
             # wait keyboard or mouse event
            for event in pygame.event:
                if event.type == pygame.quit():
                    sys.exit()
                # draw the screen after all the changes occured
                self.screen.fill(self.settings.bg_color)
                self.ship.blitme()
                print("izan")
                pygame.display.flip()
                print("izan ssin")

if __name__ == "main":
    partie = Alien_invasion()
    partie.run_game()

我希望有一个 pygame 窗口，但控制台打印：

pygame 2.0.1 (SDL 2.0.14,Python 3.9.0)
Hello from the pygame community. https://www.pygame.org/contribute.html

之后什么也没有发生！

解决方法

带有“###”的行是我的更正。

from ship import Ship
from settings import Settings
import sys
import pygame


class Alien_invasion:
    """class to manage the game"""

    def __init__(self):
        """initialise the game and create game ressources"""
        pygame.init()
        #print("ouzou")
        self.settings=Settings()
        self.screen = 
           pygame.display.set_mode(self.settings.screen_height,self.settings.screen_width)
        
        pygame.display.set_caption("Alien invasion")
        self.ship = Ship(self)
        
    def run_game(self):
        """start the game by calling a main loop"""
        while True:
            print("izann")
             # wait keyboard or mouse event
            for event in pygame.event.get():      ###syntax
                if event.type == pygame.QUIT:     ###syntax
                    sys.exit()
           # draw the screen after all the changes occurred   ###the following should not in the pygame event get loop
           self.screen.fill(self.settings.bg_color)
           self.ship.blitme()
           print("izan")
           pygame.display.flip()
           print("izan ssin")

if __name__ == "__main__":       ###syntax wrong
    partie = Alien_invasion()
    partie.run_game()

,

pygame.quit() 是一个函数，用于取消初始化所有 PyGame 模块。当你这样做

if event.type == pygame.quit():

函数被调用，所有 PyGame 模块都未初始化。

pygame.event.Event() 对象的 type 属性表示事件的类型。您需要将事件类型与标识事件的枚举常量进行比较。 quit 事件由 pygame.QUIT 标识（参见 pygame.event 模块）：

因此，您必须与 pygame.QUIT 而不是 pygame.quit() 竞争：

for event in pygame.event:
    if event.type == pygame.QUIT:
        pygame.quit()
        sys.exit()

此外还有一个 Indentation 问题。您必须在应用程序循环而不是事件循环中绘制场景并更新显示：

from ship import Ship
from settings import Settings
import sys
import pygame


class Alien_invasion:
    """class to manage the game"""

    def __init__(self):
        """initialise the game and create game ressources"""
        pygame.init()
        #print("ouzou")
        self.settings=Settings()
        self.screen = pygame.display.set_mode(self.settings.screen_height,self.settings.screen_width)
        
        pygame.display.set_caption("Alien invasion")
        self.ship = Ship(self)
        
    def run_game(self):
        """start the game by calling a main loop"""
        while True:
            print("izann")
             # wait keyboard or mouse event
            for event in pygame.event:
                if event.type == pygame.QUIT:
                    pygame.quit()
                    sys.exit()
            
            # INDENTATION

            #<--|
    
            # draw the screen after all the changes occured
            self.screen.fill(self.settings.bg_color)
            self.ship.blitme()
            print("izan")
            pygame.display.flip()
            print("izan ssin")

if __name__ == "__main__":
    partie = Alien_invasion()
    partie.run_game()