Python速成班-外来入侵-错误背景

问题描述

我正在执行Python Crash Course Alien入侵，当我测试此代码时，飞船的图像没有出现。只是黑色背景。

我一直在努力寻找原因。

游戏代码（alien_invasion.py）：

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


def run_game():
    # Initialize pygame,settings,and screen object.
    pygame.init()
    ai_settings = Settings()
    
    screen = pygame.display.set_mode(
        (ai_settings.screen_width,ai_settings.screen_height))
    pygame.display.set_caption("Alien Invasion")
    
    screen.fill(ai_settings.bg_color)
    # Make a ship.
    ship = Ship(screen)

    # Background color
    bg_color = (230,230,230)

    # Start the main loop for the game
    while True:

        ship.blitme()
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                sys.exit()
                self.screen.fill(self.settings.bg_color)
                pygame.display.flip()
run_game()

设置代码（settings.py）：

class Settings():
   """Initialize the game's settings."""
   # Screen settings
  def __init__(self):
    self.screen_width = 1200
    self.screen_height = 800
    self.bg_color = (230,230)

船代号（ship.py）

import pygame

class Ship():
    def __init__(self,screen):
        self.screen = screen
        # Load the ship image and get its rect.
        self.image = pygame.image.load(r'C:\Users\user\Desktop\alien invasion\ship.bmp')
        self.rect = self.image.get_rect()
        self.screen_rect = screen.get_rect()
        # Start each new ship at the bottom center of the screen.
        self.rect.centerx = self.screen_rect.centerx
        self.rect.bottom = self.screen_rect.bottom

    def blitme(self):
        self.screen.blit(self.image,self.rect)

没有错误出现，但是当我运行此代码时，什么也没有发生。只是黑屏。

解决方法

这是Indentation的问题。您必须在主应用程序循环中更新显示。
此外，您需要在绘制背景之后绘制飞船：

def run_game():
    # [...]

    while True:

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                sys.exit()
    
        #<--| INDENTATION

        # draw background        
        screen.fill(ai_settings.bg_color)

        # draw scene (ship)
        ship.blitme()

        # update disaply
        pygame.display.flip()