存储项目的大部分函数

game_functions.py

@@ -101,4 +101,37 @@ def update_bullets(ai_settings, screen, stats, sb, ship, aliens, bullets, bossal
         if bullet.rect.bottom <= 0:
             bullets.remove(bullet)
 
-    check_bullet_collisions(ai_settings, screen, stats, sb, ship, aliens, bossalien, bullets, bossbullet)
+    check_bullet_collisions(ai_settings, screen, stats, sb, ship, aliens, bossalien, bullets, bossbullet)
+def check_bullet_collisions(ai_settings, screen, stats, sb, ship, aliens, bossalien, bullets, bossbullet):
+    """响应子弹和外星人的碰撞，以及外星人子弹和船的碰撞"""
+    # 增加：只有在非BOSS关才启用
+    if stats.level != stats.bosslevel:
+
+        # 删除发生碰撞的子弹和外星人
+        collisions = pygame.sprite.groupcollide(bullets, aliens, True, True)
+
+        if collisions:
+            for aliens in collisions.values():
+                stats.score += ai_settings.alien_points * len(aliens)
+                sb.prep_score()
+            check_high_score(stats, sb)
+
+        if len(aliens) == 0:
+            # 如果整群外星人都被消灭，就提高一个等级
+            bullets.empty()
+            ai_settings.increase_speed()
+
+            # 增加：播放音效
+            pygame.mixer.init()
+            sound = pygame.mixer.Sound('sounds/levelup.wav')
+            sound.play()
+
+            # 提高等级
+            stats.level += 1
+            sb.prep_level()
+
+            # 如果当前关卡下一关是BOSS关就不要再生成舰队
+            if stats.level != stats.bosslevel - 1:
+                create_fleet(ai_settings, screen, ship, aliens)
+            else:
+                pass