《外星人入侵》Python

import sys from time import sleep import pygame from bullet import Bullet from alien import Alien total_numbers = 0 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: # 创建一颗子弹，并将其加入到bullets编组中 # fire_bullet(ai_settings, screen, ship, bullets) ai_settings.bullet_firing = True # 热键，关闭游戏 elif event.key == pygame.K_q: sys.exit() def check_keyup_events(event, ai_setting, 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 elif event.key == pygame.K_SPACE: ai_setting.bullet_firing = False def check_events(ai_settings, stats, screen, ship, bullets, aliens, play_button, sb): # 响应鼠标和按键事件 for event in pygame.event.get(): # 鼠标关闭 if event.type == pygame.QUIT: sys.exit() # 按快捷键Q关闭游戏 elif event.type == pygame.MOUSEBUTTONDOWN: """ 响应鼠标事件 """ mouse_x, mouse_y = pygame.mouse.get_pos() check_play_button(ai_settings, stats, screen, ship, aliens, bullets, play_button, sb, mouse_x, mouse_y) elif event.type == pygame.KEYDOWN: check_keydown_events(event, ai_settings, screen, ship, bullets) elif event.type == pygame.KEYUP: check_keyup_events(event, ai_settings, ship) def check_play_button(ai_settings, stats, screen, ship, aliens, bullets, play_button, sb, mouse_x, mouse_y): """ 再玩家单击play按钮时开始新游戏 """ if play_button.rect.collidepoint(mouse_x, mouse_y) and not stats.game_active: # 隐藏光标 pygame.mouse.set_visible(False) """ 重置游戏统计信息 """ stats.reset_stats() stats.game_active = True # 重置记分牌图像、等级、记录、飞船数量 sb.prep_high_score() sb.prep_level() sb.prep_score() sb.prep_ships() # 重置游戏节奏 ai_settings.initialize_dynamic_settings() # 清空外星人列表和子弹列表 aliens.empty() bullets.empty() # 创建一群新的外星人并让飞船剧中显示 create_fleet(ai_settings, screen, ship, aliens) ship.center_ship() def update_screen(ai_settings, stats, screen, ship, aliens, bullets, play_button, sb): """ 更新屏幕上的图像，并切换到新的屏幕 """ # 每次循环都要重绘屏幕 screen.fill(ai_settings.bg_color) # 在飞船和外星人后面重绘制所有子弹 for bullet in bullets.sprites(): bullet.draw_bullet() ship.blitme() # for alien in aliens.sprites(): # alien.blitme() aliens.draw(screen) # 如果游戏处于非活动状态时，绘制按钮 if not stats.game_active: play_button.draw_button() # 创建记分牌 sb.show_score() # 让绘制的屏幕可见 pygame.display.flip() def update_bullets(ai_settings, stats, screen, ship, aliens, bullets, sb): """ 更新子弹的位置， 并删除已消失子弹 """ # 更新子弹位置 bullets.update() # 检查开火标志位，开火 if ai_settings.bullet_firing: fire_bullet(ai_settings, screen, ship, bullets) # 删除已经消失的子弹 for bullet in bullets.copy(): if bullet.rect.bottom <= 0: bullets.remove(bullet) # 检查外星人与子弹碰撞 check_alien_collisions(ai_settings, stats, screen, ship, bullets, aliens,sb) def check_alien_collisions(ai_settings, stats, screen, ship, bullets, aliens, sb): """ 检查外星人与子弹碰撞 """ # 删除发生碰撞的子弹和外星人 collisions = pygame.sprite.groupcollide(bullets, aliens, True, True) # 计分 if collisions: for aliens in collisions.values(): stats.score += ai_settings.alien_points * len(aliens) sb.prep_score() # 刷新最高分纪录 check_high_score(stats, sb) # 检查外星人是否被消灭干净 if len(aliens) == 0: # 加快游戏节奏 ai_settings.increase_speed() # 删除现有子弹并新建一群外星人 bullets.empty() sleep(2) create_fleet(ai_settings, screen, ship, aliens) # 提高玩家等级 stats.level += 1 sb.prep_level() def fire_bullet(ai_settings, screen, ship, bullets): """ 发射子弹 """ if len(bullets) < ai_settings.bullets_allowed: new_bullet = Bullet(ai_settings, screen, ship) bullets.add(new_bullet) def get_number_aliens(ai_settings, alien_width): """ 获取每行可容纳的外星人数""" avaliable_space_x = ai_settings.screen_width - 2 * alien_width number_aliens_x = int(avaliable_space_x / (1.5 * alien_width)) return number_aliens_x def get_number_rows(ai_settings, ship_height, alien_height): """ 计算整个屏幕能够容纳多少行外星人 """ available_space_y = ai_settings.screen_height - 3*alien_height-ship_height number_rows = int(available_space_y/(1.5 * alien_height)) return number_rows def creat_alien(ai_settings, screen, aliens, alien_number, row_number): """ 创建一个外星人放在当前行 """ alien = Alien(ai_settings, screen) alien_width = alien.rect.width # 外星人的横坐标位置 alien.x = alien_width + 1.5*alien_width*alien_number alien.rect.x = alien.x # 绘制外星人纵坐标位置 alien.rect.y = alien.rect.height + 20 + 1.5*alien.rect.height*row_number aliens.add(alien) def create_fleet(ai_settings, screen, ship, aliens): """ 创建外星人群 """ global total_numbers alien = Alien(ai_settings, screen) number_aliens_x = get_number_aliens(ai_settings, alien_width=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): # 创建一个外星人并加入当前行 creat_alien(ai_settings, screen, aliens, alien_number, row_number) # 计算屏幕中共有外星人数量 total_numbers = number_rows * number_aliens_x def check_fleet_edges(ai_settings, aliens): """ 当有外星人到达边缘时采取相应的措施 """ global total_numbers for i in range(len(aliens), total_numbers+1): pass for alien in aliens.sprites(): if alien.check_edges(): change_fleet_direction(ai_settings, aliens) break def change_fleet_direction(ai_settings, aliens): """ 将外星人整体下移,并改变移动方向 """ global total_numbers for i in range(len(aliens), total_numbers+1): pass for alien in aliens.sprites(): alien.rect.y += ai_settings.fleet_drop_speed ai_settings.fleet_direction *= -1 def ship_hit(ai_settings, stats, screen, ship, aliens, bullets, sb): """ 响应被外星人撞到的飞船 """ # 将ships_left 减一 if stats.ships_left > 0: stats.ships_left -= 1 # 清空外星人列表和子弹列表 aliens.empty() bullets.empty() sb.prep_ships() # 创建一群新的外星人，并将飞船放置到中央屏幕 create_fleet(ai_setting