1.外星人设置，外星人设置，alien.py，代码：，代码：
import pygame
from pygame.sprite import Sprite
class Alien(Sprite):
"""表示单个外星人的类"""
def __init__(self,ai_settings,screen):
"""初始化外星人并设置其他位置"""
super(Alien,self).__init__()
self.screen = screen
self.ai_settings = ai_settings
#加载外星人图像，并设置其rect属性
self.image = pygame.image.load('images/alien.bmp')
self.rect = self.image.get_rect()
#每个外星人最初都在屏幕左上角附近
self.rect.x = self.rect.width
self.rect.y = self.rect.height
#存储外星人的准确位置
self.x = float(self.rect.x)
def blitme(self):
"""在指定位置绘制外星人"""
self.screen.blit(self.image,self.rect)
def check_edges(self):
"""如果外星人位于屏幕边缘，就返回True"""
screen_rect = self.screen.get_rect()
if self.rect.right >= screen_rect.right:
return True
elif self.rect.left <= 0:
return True
def update(self):
"""向右移动外星人"""
self.x += (self.ai_settings.alien_speed_factor * self.ai_settings.fleet_direction)
self.rect.x = self.x
2.游戏主程序，游戏主程序，alien_invasion.py，代码，代码:
import pygame
from settings import Settings
from game_stats import GameStats
from button import Button
from ship import Ship
from pygame.sprite import Group
import game_functions as gf
from scoreboard import Scoreboard
def run_game():
pygame.init() # 初始化背景设置
ai_settings = Settings() # 全局设置
screen = pygame.display.set_mode( # 创建screen显示窗口
(ai_settings.screen_width,ai_settings.screen_height)
)
pygame.display.set_caption('Alien Invasion') # 标题
#新建Play按钮
play_button = Button(ai_settings,screen,"Play")
#创建一个用于存储游戏统计信息的实例,并创建记分牌
stats = GameStats(ai_settings)
