Pygame實戰之實現經典外星人遊戲

import pygame
from pygame.sprite import Sprite
 
class Alien(Sprite):
 """表示單個外星人的類"""
 
 def __init__(self,ai_settings,screen):
  """初始化外星人並設置其他位置"""
  super(Alien,self).__init__()
  self.screen = screen
  self.ai_settings = ai_settings
  
  #加載外星人圖像，並設置其rect屬性
  self.image = pygame.image.load('images/alien.bmp')
  self.rect = self.image.get_rect()
  
  #每個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
  
  #存儲外星人的準確位置
  self.x = float(self.rect.x)
  
  
 def blitme(self):
  """在指定位置繪制外星人"""
  self.screen.blit(self.image,self.rect)
    
 def check_edges(self):
  """如果外星人位於屏幕邊緣，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):
  """向右移動外星人"""
  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()    # 初始化背景設置
  ai_settings = Settings()    # 全局設置
 
  screen = pygame.display.set_mode(      # 創建screen顯示窗口
    (ai_settings.screen_width,ai_settings.screen_height)
  )
  pygame.display.set_caption('Alien Invasion')  # 標題
  #新建Play按鈕
  play_button = Button(ai_settings,screen,"Play")
  #創建一個用於存儲遊戲統計信息的實例,並創建記分牌
  stats = GameStats(ai_settings)
  sb = Scoreboard(ai_settings, screen, stats)
  # 創建飛船
  ship = Ship(ai_settings,screen)
  # 創建子彈編組
  bullets = Group()
  
  #創建一個外星人
  aliens = Group()
  #創建外星人群
  gf.create_fleet(ai_settings,screen,ship,aliens)
  
  # 開始遊戲主循環
  while True:
    # 監視鍵盤和鼠標事件
    gf.check_events(ai_settings,screen,stats,sb,play_button,ship,aliens,bullets)
    
    if stats.game_active:
      # 移動飛船
      gf.update_ship(ship)
      # 更新子彈位置
      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):
  '''飛船子彈進行管理'''
 
  def __init__(self,ai_settings,screen,ship):
    super(Bullet,self).__init__()
    self.screen = screen
 
    # 創建子彈矩形初始位置（0,0,3,15）分別對應lef，top，寬，高
    self.rect = pygame.Rect(0,0,
    ai_settings.bullet_width, ai_settings.bullet_height)
 
    self.rect.centerx = ship.rect.centerx # 設置中心點x軸坐標跟飛船一致
    self.rect.top = ship.rect.top     # 設置y軸坐標頂部跟飛船一致
 
    # 設置成小數進行計算
    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.....................................