功能函数更改

game_functions.py

@@ -84,3 +84,101 @@ def start_game(ai_settings, screen, ship, bullets, game_stats, scoreb,
     sleep(0.5)
 
 
+def check_keyup_events(event, ship):
+    """"
+        响应鼠标松开---飞船停下
+    """
+    if event.key == pygame.K_RIGHT:
+        ship.moving_right = False
+
+    elif event.key == pygame.K_LEFT:
+        ship.moving_left = False
+
+
+def check_play_button(ai_settings, screen, game_stats, scoreb, play_button, ship,
+                      aliens, bullets, mouse_x, mouse_y):
+    """
+        在玩家单击Play按钮时开始游戏
+    """
+    button_clicked = play_button.button_rect.collidepoint(mouse_x, mouse_y)
+    # 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
+    if button_clicked and not game_stats.game_active:
+        """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"""
+
+        # # 重置游戏设置
+        ai_settings.initialize_dynamic_settings()
+
+        # 游戏开始后Play按钮隐藏起来
+        pygame.mouse.set_visible(False)
+
+        start_game(ai_settings, screen, ship, bullets, game_stats, scoreb, aliens)
+
+
+def check_events(ai_settings, screen, game_stats, scoreb, play_button, ship, aliens, bullets):
+    """
+        响应鼠标和键盘事件
+    """
+    # 游戏退出并把最高分写入文件
+    for event in pygame.event.get():
+        if event.type == pygame.QUIT:
+            with open('Max_score.json', 'w', encoding='UTF-8') as file:
+                json.dump(game_stats.high_score, file)
+            sys.exit()
+
+        # 响应Play按钮操作
+        elif event.type == pygame.MOUSEBUTTONDOWN:
+            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
+            check_play_button(ai_settings, screen, game_stats, scoreb, play_button, ship,
+                              aliens, bullets, mouse_x, mouse_y)
+
+        # 判读飞船向左还是向右移动
+        elif event.type == pygame.KEYDOWN:
+            check_keydown_events(event, ai_settings, screen, ship, bullets, game_stats, scoreb, aliens)
+
+        # 飞船停下
+        elif event.type == pygame.KEYUP:
+            check_keyup_events(event, ship)
+
+
+def update_screen(ai_settings, screen, game_stats, scoreb, 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)   # 先填充背景后绘制飞船
+    ship.blitem()
+    aliens.draw(screen)
+
+    # 在飞船后重绘所有子弹
+    for bullet in bullets.sprites():
+        bullet.draw_bullet()
+    # 显示得分
+    scoreb.show_score()
+
+    # 如果游戏处于非活动状态就绘制Play按钮
+    if not game_stats.game_active:
+        play_button.draw_button()
+
+    # 让最近绘制的屏幕可见
+    pygame.display.flip()
+
+
+def start_new_level(ai_settings, screen, game_stats, scoreb, ship, aliens, bullets):
+    """
+        当消灭干净外星人提高一个等级
+    """
+    if len(aliens) == 0:
+        # 删除现有子弹
+        bullets.empty()
+
+        # 逐渐提高速度加快游戏节奏
+        ai_settings.increase_speed()
+
+        # 当前屏幕外星人全部被消灭就提高一个等级
+        game_stats.level += 1
+        scoreb.prep_level()
+
+        # 创建一群新的外星人
+        create_fleet(ai_settings, screen, ship, aliens)  # 调用创建外星人群的函数
+
+