說明：這是python編程從入門到實踐中255頁說明的程序的一個自己的改編。

rain相當于書中的alien(外星人)，rains(就是外星人群),spider相當于ship其余的和書中類似。

代碼自己改編了一部分。自己瞎寫的。?

#bullet.py import pygame from pygame.sprite import Sprite class Bullet(Sprite):def __init__(self,screen,spider,settings):super(Bullet,self).__init__()self.screen = screenself.spider = spiderself.rect = pygame.Rect(0,0,settings.bullet_width,settings.bullet_height)self.rect.top = self.spider.rect.topself.rect.centerx = self.spider.rect.centerxself.settings = settingsself.y = float(self.rect.y)def update(self):self.y -= self.settings.bullet_speed_factorself.rect.y = self.ydef draw_bullet(self):pygame.draw.rect(self.screen,self.settings.bullet_color,self.rect)#game_functions.py import pygame import sys from rain import Rain from bullet import Bullet from time import sleepdef check_key_events(role,screen,spider,settings,bullets):for event in pygame.event.get():if event.type == pygame.QUIT:sys.exit()elif event.type == pygame.KEYDOWN:check_keydown_events(event,role,screen,spider,settings,bullets)elif event.type == pygame.KEYUP:check_keyup_events(event,role)def check_keydown_events(event,role,screen,spider,settings,bullets):if event.key == pygame.K_q:sys.exit()elif event.key == pygame.K_LEFT:role.moving_left = Trueelif event.key == pygame.K_RIGHT:role.moving_right = Trueelif event.key == pygame.K_UP:role.moving_up = Trueelif event.key == pygame.K_DOWN:role.moving_down = Trueelif event.key == pygame.K_SPACE:bullet = Bullet(screen,spider,settings)bullets.add(bullet)def check_keyup_events(event,role):if event.key == pygame.K_LEFT:role.moving_left = Falseelif event.key == pygame.K_RIGHT:role.moving_right = Falseelif event.key == pygame.K_UP:role.moving_up = Falseelif event.key == pygame.K_DOWN:role.moving_down = False def update_bullets(bullets,rains):bullets.update()collision_ = pygame.sprite.groupcollide(bullets,rains,True,True)def update_screen(settings,screen,rains,role,bullets):screen.fill(settings.color)rains.draw(screen)role.blitme()for bullet in bullets.sprites():bullet.draw_bullet()pygame.display.flip()def get_available_space_x(settings,rain):available_space_x = settings.screen_width - 4 * rain.rect.widthreturn available_space_x def get_rain_numbers_x(settings,rain):available_space_x = get_available_space_x(settings,rain)rain_numbers = int(available_space_x / (2 * rain.rect.width))return rain_numbers def get_available_space_y(settings,rain):available_space_y = settings.screen_height - (4 * rain.rect.height)return available_space_y def get_rain_rows(settings,rain):available_space_y = get_available_space_y(settings,rain)rain_rows = int(available_space_y / (2 * rain.rect.height))return rain_rows def create_rain_drop(screen,settings,row_number,rain_number_x,rain,rains):rain_width = rain.rect.widthrain_height = rain.rect.heightrain_drop =Rain(screen,settings) rain_drop.x = rain_width + 2 * rain_width * rain_number_xrain_drop.y = rain_height + 2 * rain_height * row_numberrain_drop.rect.x = rain_drop.xrain_drop.rect.y = rain_drop.yrains.add(rain_drop)def create_rain_sets(settings,rain,screen,rains):rain_width = rain.rect.widthrain_height = rain.rect.heightrow_numbers = get_rain_rows(settings,rain)rain_numbers_x = get_rain_numbers_x(settings,rain)for row_number in range(row_numbers):for rain_number in range(rain_numbers_x):create_rain_drop(screen,settings,row_number,rain_number,rain,rains)def update_rains(rains,rain,settings,screen,role,stats,bullets):rains.update()if pygame.sprite.spritecollideany(role,rains): ship_hit(settings,stats,screen,rains,bullets,role,rain)"""for rain in rains.copy():if rain.is_out():rains.remove(rain) print("spider hit!!!")"""if len(rains) == 0 and stats.ships_left > 0:create_rain_sets(settings,rain,screen,rains)role.center_ship()#暫停sleep(0.5)check_aliens_bottom(settings,stats,screen,role,rains,bullets,rain)#下面這行代碼不能縮進，不能依賴for循環的執行，因為#for循環可能不會執行 def ship_hit(settings,stats,screen,rains,bullets,role,rain):if stats.ships_left > 0: stats.ships_left -= 1rains.empty()bullets.empty()#為何沒有下面一句飛機蜘蛛完了還能移動呢？#而且，即時沒有下一句，底下的大蜘蛛role碰撞了rains后，rains并不消失，屏幕上#還有許多的rainscreate_rain_sets(settings,rain,screen,rains)role.center_ship()else:stats.game_active = Falsedef check_aliens_bottom(settings,stats,screen,role,rains,bullets,rain):screen_rect = screen.get_rect()for rain in rains.sprites():if rain.rect.bottom >= screen_rect.bottom:ship_hit(settings,stats,screen,rains,bullets,role,rain)break#game.py from pygame.sprite import Group import sys import pygame from settings import Settings import game_functions as gf from rain import Rain from role import Role from game_stats import GameStatsdef run_game():pygame.init()my_set = Settings()screen = pygame.display.set_mode((my_set.screen_width,my_set.screen_height))pygame.display.set_caption(my_set.caption)my_rain = Rain(screen,my_set)rains = Group()gf.create_rain_sets(my_set,my_rain,screen,rains)stats = GameStats(my_set)my_role = Role(screen,my_set)bullets = Group()while True:gf.check_key_events(my_role,screen,my_role,my_set,bullets)if stats.game_active:gf.update_rains(rains,my_rain,my_set,screen,my_role,stats,bullets)my_role.update()gf.update_bullets(bullets,rains)gf.update_screen(my_set,screen,rains,my_role,bullets)print(stats.game_active)print(stats.ships_left) run_game() #game_stats.py class GameStats():def __init__(self,settings):"""init the stats information"""self.game_active = Trueself.settings = settingsself.reset_stats()def reset_stats(self):self.ships_left = self.settings.ship_limitfrom pygame.sprite import Sprite import pygame import sys from random import randint class Rain(Sprite):def __init__(self,screen,settings):super(Rain,self).__init__()self.screen = screenself.image = pygame.image.load("role/1234.bmp")self.rect = self.image.get_rect()self.screen_rect = self.screen.get_rect()self.rect.x = self.rect.widthself.rect.y = self.rect.heightself.y = float(self.rect.y)self.x = float(self.rect.x)self.settings = settingsdef blitme(self):self.screen.blit(self.image,self.rect)def update(self):#上下左右隨機運動r = randint(1,4)mod = r % 4if mod == 0:self.y -= self.settings.bullet_speed_factorelif mod == 1:self.y += self.settings.bullet_speed_factorelif mod == 2:self.x -= self.settings.bullet_speed_factorelif mod == 3:self.x += self.settings.bullet_speed_factorself.rect.x = self.xself.rect.y = self.ydef is_out(self):if self.rect.bottom < self.screen_rect.top:return Trueelif self.rect.top > self.screen_rect.bottom:return Trueelif self.rect.right < 0:return Trueelif self.rect.left > self.screen_rect.right:return Trueelse:return False#role.py import pygame class Role():def __init__(self,screen,settings):self.image = pygame.image.load("role/spider.bmp")self.rect = self.image.get_rect()self.screen = screenself.screen_rect = self.screen.get_rect()self.rect.bottom = self.screen_rect.bottomself.rect.centerx = self.screen_rect.centerxself.moving_right = Falseself.moving_left = Falseself.moving_up = Falseself.moving_down = Falseself.x = float(self.rect.x)self.y = float(self.rect.y)self.settings = settingsdef blitme(self):self.screen.blit(self.image,self.rect)def update(self):if self.moving_right and self.rect.right < self.screen_rect.right:self.x += self.settings.role_speed_factorelif self.moving_left and self.rect.left > 0:self.x -= self.settings.role_speed_factorelif self.moving_up and self.rect.top > self.screen_rect.top:self.y -= self.settings.role_speed_factorelif self.moving_down and self.rect.bottom < self.screen_rect.bottom:self.y += self.settings.role_speed_factorself.rect.x = self.xself.rect.y = self.ydef center_ship(self):#以下兩句代碼不管用#原因在于每次#self.rect.centerx = self.screen_rect.centerx#self.rect.bottom = self.screen_rect.bottomself.x = self.screen_rect.centerxself.x -= 0.5 * float(self.rect.width)self.y = self.screen_rect.bottom - 40self.rect.x = self.xself.rect.y = self.y#settings.py class Settings():def __init__(self):self.rain_drop_speed = 0.2self.screen_width = 1000self.screen_height = 800self.caption = 'rain_drop'self.color = (255,255,255)self.role_speed_factor = 1.5self.bullet_width = 3self.bullet_height = 15self.bullet_speed_factor = 2#紅色子彈self.bullet_color = 255,0,0 self.ship_limit = 5

問題，game_functions.py中的一個問題，已經卸載game_functions.py中了。

總結

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