143 lines
4.5 KiB
Python
143 lines
4.5 KiB
Python
# 《外星人入侵》运行的所有函数
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import sys
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import pygame
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from bullet import Bullet
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from alien import Alien
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from time import sleep
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import json
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import music
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def play_bg_music():
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"""背景音乐"""
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if not pygame.mixer.music.get_busy():
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pygame.mixer.music.play()
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def check_keydown_events(event, ai_settings, screen, ship, bullets, game_stats, scoreb, aliens):
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""""
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响应鼠标按下操作
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"""
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# 按右箭头飞船向右移动
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if event.key == pygame.K_RIGHT:
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ship.moving_right = True
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# 按左箭头飞船向左移动
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elif event.key == pygame.K_LEFT:
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ship.moving_left = True
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# 按空格键创建一颗子弹并将其加入到编组bullets中
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elif event.key == pygame.K_SPACE:
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fire_bullet(ai_settings, screen, ship, bullets)
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# 按p开始游戏
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elif event.key == pygame.K_p:
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start_game(ai_settings, screen, ship, bullets, game_stats, scoreb,
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aliens)
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# 按z暂停游戏3s
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elif event.key == pygame.K_z:
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sleep(2)
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# 按q退出游戏并把最高分写入文件
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elif event.key == pygame.K_q:
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with open('Max_score.json', 'w', encoding='UTF-8') as file:
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json.dump(game_stats.high_score, file)
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sys.exit()
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def fire_bullet(ai_settings, screen, ship, bullets):
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"""
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按照要求发射子弹数量
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"""
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if len(bullets) < ai_settings.bullet_allowed:
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music.bullet_biu() # 发射子弹的声音
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new_bullet = Bullet(ai_settings, screen, ship) # 如果还没有到达限制，就发射一颗子弹
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bullets.add(new_bullet) # 创建一颗子弹，并将其加入到编组bullets中
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def start_game(ai_settings, screen, ship, bullets, game_stats, scoreb,
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aliens):
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"""
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P264中动手试一试14-1的练习：让玩家按p开始游戏
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"""
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# 重置游戏统计信息
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game_stats.reset_stats()
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game_stats.game_active = True
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# 重置记分牌图像
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scoreb.prep_score()
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scoreb.prep_high_score()
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scoreb.prep_level()
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scoreb.prep_ships()
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# 清空外星人列表和子弹列表
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aliens.empty()
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bullets.empty()
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# 创建一群新的外星人，并让飞船居中
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create_fleet(ai_settings, screen, ship, aliens)
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ship.center_ship()
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# 暂停让用户反应一会
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sleep(0.5)
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def check_keyup_events(event, ship):
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""""
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响应鼠标松开---飞船停下
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"""
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if event.key == pygame.K_RIGHT:
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ship.moving_right = False
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elif event.key == pygame.K_LEFT:
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ship.moving_left = False
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def check_play_button(ai_settings, screen, game_stats, scoreb, play_button, ship,
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aliens, bullets, mouse_x, mouse_y):
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"""
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在玩家单击Play按钮时开始游戏
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"""
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button_clicked = play_button.button_rect.collidepoint(mouse_x, mouse_y)
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# 单击Play按钮且游戏处于非活跃状态时----避免了游戏处于活跃状态下单击到了Play按钮区域重启游戏
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if button_clicked and not game_stats.game_active:
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"""如果鼠标单击位置在msg_image_rect范围内则将游戏置于活跃状态"""
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# # 重置游戏设置
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ai_settings.initialize_dynamic_settings()
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# 游戏开始后Play按钮隐藏起来
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pygame.mouse.set_visible(False)
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start_game(ai_settings, screen, ship, bullets, game_stats, scoreb, aliens)
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def check_events(ai_settings, screen, game_stats, scoreb, play_button, ship, aliens, bullets):
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"""
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响应鼠标和键盘事件
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"""
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# 游戏退出并把最高分写入文件
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for event in pygame.event.get():
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if event.type == pygame.QUIT:
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with open('Max_score.json', 'w', encoding='UTF-8') as file:
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json.dump(game_stats.high_score, file)
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sys.exit()
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# 响应Play按钮操作
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elif event.type == pygame.MOUSEBUTTONDOWN:
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mouse_x, mouse_y = pygame.mouse.get_pos() # 该函数返回一个元组--获取鼠标单击Play按钮时的位置
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check_play_button(ai_settings, screen, game_stats, scoreb, play_button, ship,
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aliens, bullets, mouse_x, mouse_y)
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# 判读飞船向左还是向右移动
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elif event.type == pygame.KEYDOWN:
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check_keydown_events(event, ai_settings, screen, ship, bullets, game_stats, scoreb, aliens)
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# 飞船停下
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elif event.type == pygame.KEYUP:
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check_keyup_events(event, ship)
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