python学习测试小例子

import sys import pygame from bullet import Bullet from alien import Alien def fire_bullets(ai_settings, screen, ship, bullets): if len(bullets) < ai_settings.bullet_allowed: # 创建一颗子弹并将其加入到编组中 new_bullet = Bullet(ai_settings, screen, ship) bullets.add(new_bullet) def check_keydown_events(event, ai_settings, screen, ship, bullets): if event.key == pygame.K_RIGHT: ship.moving_right = True if event.key == pygame.K_LEFT: ship.moving_left = True if event.key == pygame.K_SPACE: fire_bullets(ai_settings, screen, ship, bullets) if event.key == pygame.K_q: sys.exit() def check_keyup_events(event, ship): if event.key == pygame.K_RIGHT: ship.moving_right = False if 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) def update_screen(ai_settings, screen, ship, aliens, bullets): # 每次循环都重新绘制屏幕 screen.fill(ai_settings.bg_color) for bullet in bullets.sprites(): bullet.draw_bullet() ship.blitme() aliens.draw(screen) # 让最近绘制的屏幕可见 pygame.display.flip() def update_bullets(ai_settings, screen, ship, aliens, bullets): bullets.update() # 删除已经消失的子弹 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): collisions = pygame.sprite.groupcollide(bullets, aliens, True, True) if len(aliens) == 0: bullets.empty() create_fleet(ai_settings, screen, ship, aliens) def get_number_alien_x(ai_settings, alien_width): available_space_x = ai_settings.screen_width - 2 * alien_width number_alien_x = int(available_space_x / (2 * alien_width)) return number_alien_x def get_number_alien_y(ai_settings, ship_height, alien_height): available_space_y = ai_settings.screen_height - 3 * alien_height - ship_height number_alien_y = int(available_space_y / (2 * alien_height)) return number_alien_y def check_fleet_edge(ai_settings, aliens): """有外星人到达边缘是采取相应措施""" 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，并改变他们的方向""" for alien in aliens.sprites(): alien.rect.y += ai_settings.fleet_drop_speed ai_settings.fleet_direction *= -1 def create_alien(ai_settings, screen, aliens, alien_number, row_number): 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 create_fleet(ai_settings, screen, ship, aliens): alien = Alien(ai_settings, screen) number_alien_x = get_number_alien_x(ai_settings, alien.rect.width) number_alien_y = get_number_alien_y( ai_settings, ship.rect.height, alien.rect.height ) for row_number in range(number_alien_y): for alien_number in range(number_alien_x): create_alien(ai_settings, screen, aliens, alien_number, row_number) def update_aliens(ai_settings, ship, aliens): check_fleet_edge(ai_settings, aliens) aliens.update() if pygame.sprite.spritecollideany(ship, aliens): print("Ship hit!!!")