Python小游戏外星人入侵

import sys import pygame from bullet import Bullet from alien import Alien from time import sleep def check_keydown_events(event,ai_settings, screen, ship, bullets): """响应按键""" if event.key == pygame.K_RIGHT: ship.moving_right = True elif event.key == pygame.K_LEFT: ship.moving_left = True elif event.key == pygame.K_SPACE: fire_bullet(ai_settings, screen, ship, bullets) def fire_bullet(ai_settings, screen, ship, bullets): """如果还没有达到限制，就发射一颗子弹""" #创建新的子弹，并将其加入到编组bullets中 if len(bullets) < ai_settings.bullets_allowed: new_bullet = Bullet(ai_settings, screen, ship) bullets.add(new_bullet) def check_keyup_events(event, ship): """响应松开""" if event.key == pygame.K_RIGHT: ship.moving_right = False elif event.key == pygame.K_LEFT: ship.moving_left = False def check_events(ai_settings, screen, ship, bullets): """响应按键和鼠标事件""" for event in pygame.event.get(): if event.type == pygame.QUIT: sys.exit() elif event.type == pygame.KEYDOWN: check_keydown_events(event,ai_settings, screen, ship, bullets) elif event.type == pygame.KEYUP: check_keyup_events(event, ship) elif event.type == pygame.K_q: sys.exit() def update_screen(ai_settings, screen, stats, ship, aliens, bullets, play_button): """更新屏幕上的图像，并切换到新屏幕""" #每次循环时都重绘屏幕 screen.fill(ai_settings.bg_color) #在飞船和外星人后面重绘所有子弹 for bullet in bullets.sprites(): bullet.draw_bullet() ship.blitme() aliens.draw(screen) if not stats.game_active: play_button.draw_button() #让最近绘制的屏幕可见 pygame.display.flip() def update_bullets(ai_settings, screen, ship, aliens, bullets): """更新子弹的位置，并删除消失的子弹""" #更新子弹的位置 bullets.update() #删除已经消失的子弹，否则在占用内存 for bullet in bullets.copy(): if bullet.rect.bottom <= 0: bullets.remove(bullet) check_bullet_alien_collisions(ai_settings, screen, ship, aliens, bullets) def check_bullet_alien_collisions(ai_settings, screen, ship, aliens, bullets): """响应子弹和外星人的碰撞""" #删除发生碰撞的子弹和外星人 collisions = pygame.sprite.groupcollide(bullets, aliens, True, True) if len(aliens) ==0 : #删除现有子弹并且创建新的一群外星人 bullets.empty() creat_fleet(ai_settings, screen, ship, aliens) def get_number_aliens_x(ai_settings, alien_width): """计算每行可容纳多少个外星人""" available_space_x = ai_settings.screen_width - 2 * alien_width number_aliens_x = int(available_space_x / (2 * alien_width)) return number_aliens_x def creat_alien(ai_settings, screen, aliens, alien_number, row_number): #创建一个外星人并将其加入当前行 alien = Alien(ai_settings, screen) alien_width = alien.rect.width alien.x = alien_width + 2 * alien_width * alien_number alien.rect.x = alien.x alien.rect.y = alien.rect.height + 2 * alien.rect.height * row_number aliens.add(alien) def get_number_rows(ai_settings, ship_height, alien_height): """计算屏幕可以容纳多少行外星人""" available_space_y = (ai_settings.screen_height - (3 * alien_height) - ship_height) number_rows = int(available_space_y / (2 * alien_height)) return number_rows def create_fleet(ai_settings, screen, ship, aliens): """创建外星人群""" #创建一个人外星人，并计算一行可以容纳多少个外星人 #外星人间距为外星人宽度 alien = Alien(ai_settings, screen) number_aliens_x = get_number_aliens_x(ai_settings, alien.rect.width) number_rows = get_number_rows(ai_settings, ship.rect.height, alien.rect.height) #创建外星人群 for row_number in range(number_rows): for alien_number in range(number_aliens_x): creat_alien(ai_settings, screen, aliens, alien_number, row_number) def check_fleet_edges(ai_settings, aliens): """有外星人到达边缘时采取相应的措施""" for alien in aliens.sprites(): if alien.check_edges(): change_fleet_direction(ai_settings, aliens) break def change_fleet_direction(ai_settings, aliens): """将整群外星人下移，并且改变它们的方向""" for alien in aliens.sprites(): alien.rect.y += ai_settings.fleet_drop_speed ai_settings.fleet_direction *=-1 def update_aliens(ai_settings, stats, screen, ship, aliens, bullets): """检查是否有外星人位于屏幕边缘，更新外星人群中所有外星人的位置""" check_fleet_edges(ai_settings, aliens) aliens.update() #检查外星人与飞船的碰撞 if pygame.sprite.spritecollideany(ship, aliens): ship_hit(ai_settings, stats, screen, ship, aliens, bullets) #检查是否有外星人到达屏幕底部 check_aliens_bottom(ai_settings, stats, screen, ship, aliens, bullets) def ship_hit(ai_settings, stats, screen, ship, aliens, bullets): """响应被外星人撞到的飞船""" if stats.ships_left > 0: #将 ship_left 减1 stats.ships_left -= 1 #清空外星人和子弹列表 aliens.empty() bullets.empty() #创建一群新的外星人，并将飞船放到屏幕中央 create_fleet(ai_settings, screen, ship, aliens) ship.center_ship() #暂停 sleep(0.5) else: stats.game_active = False def check_aliens_bottom(ai_settings, stats, screen, ship, aliens, bullets): """检查是否有外星人到达屏幕底部""" screen_rect = screen.get_rect() for alien in aliens.sprites(): if alien.rect.bottom >= screen_rect.bottom: #像飞船被撞那样处理 ship_hit(ai_settings, stats, screen, ship, aliens, bullets) break