Pygame实战之实现经典外星人游戏

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

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)
  sb = Scoreboard(ai_settings, screen, stats)
  # 创建飞船
  ship = Ship(ai_settings,screen)
  # 创建子弹编组
  bullets = Group()
  
  #创建一个外星人
  aliens = Group()
  #创建外星人群
  gf.create_fleet(ai_settings,screen,ship,aliens)
  
  # 开始游戏主循环
  while True:
    # 监视键盘和鼠标事件
    gf.check_events(ai_settings,screen,stats,sb,play_button,ship,aliens,bullets)
    
    if stats.game_active:
      # 移动飞船
      gf.update_ship(ship)
      # 更新子弹位置
      gf.update_bullets(ai_settings,screen,stats,sb,ship,aliens,bullets)
      #更新外星人
      gf.update_aliens(ai_settings,stats,screen,sb,ship,aliens,bullets)
    # 更新屏幕
    gf.update_screen(ai_settings,screen,stats,sb,ship,aliens,bullets,play_button)
 
run_game()

import pygame
from pygame.sprite import Sprite
import time
 
class Bullet(Sprite):
  '''飞船子弹进行管理'''
 
  def __init__(self,ai_settings,screen,ship):
    super(Bullet,self).__init__()
    self.screen = screen
 
    # 创建子弹矩形初始位置（0,0,3,15）分别对应lef，top，宽，高
    self.rect = pygame.Rect(0,0,
    ai_settings.bullet_width, ai_settings.bullet_height)
 
    self.rect.centerx = ship.rect.centerx # 设置中心点x轴坐标跟飞船一致
    self.rect.top = ship.rect.top     # 设置y轴坐标顶部跟飞船一致
 
    # 设置成小数进行计算
    self.top = float(self.rect.top)
 
    self.color = ai_settings.bullet_color
    self.speed_factor = ai_settings.bullet_speed_factor
 
  def update(self):
    self.top -=self.speed_factor
    self.rect.top = self.top
    print(self.rect.top)
 
  def draw_bullet(self):
    pygame.draw.rect(self.screen,self.color,self.rect)
#略.....................................