游戏相应按键

game_functions.py

@@ -47,3 +47,51 @@ def check_keydown_events(event, ai_settings, screen, ship, bullets, game_stats,
         sys.exit()
 
 
+def fire_bullet(ai_settings, screen, ship, bullets):
+    """
+        按照要求发射子弹数量
+    """
+    if len(bullets) < ai_settings.bullet_allowed:
+        music.bullet_biu()                              # 发射子弹的声音
+        new_bullet = Bullet(ai_settings, screen, ship)  # 如果还没有到达限制，就发射一颗子弹
+        bullets.add(new_bullet)                         # 创建一颗子弹，并将其加入到编组bullets中
+
+
+def start_game(ai_settings, screen, ship, bullets, game_stats, scoreb,
+               aliens):
+    """
+        P264中动手试一试14-1的练习：让玩家按p开始游戏
+    """
+    # 重置游戏统计信息
+    game_stats.reset_stats()
+    game_stats.game_active = True
+
+    # 重置记分牌图像
+    scoreb.prep_score()
+    scoreb.prep_high_score()
+    scoreb.prep_level()
+    scoreb.prep_ships()
+
+    # 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，并让飞船居中
+    create_fleet(ai_settings, screen, ship, aliens)
+    ship.center_ship()
+
+    # 暂停让用户反应一会
+    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
+
+