功能函数更改

game_functions.py

@@ -264,3 +264,34 @@ def create_fleet(ai_settings, screen, ship, aliens):
             create_alien(ai_settings, screen, aliens, alien_number, row_number)  # 调用创建外星人的函数
 
 
+def check_fleet_edges(ai_settings, aliens):
+        """
+            有外星人到达边缘时采取相应的措施
+        """
+        for alien in aliens.sprites():
+            if alien.check_edges():
+                change_fleet_direction(ai_settings, aliens)
+                break
+
+
+def change_fleet_direction(ai_settings, aliens):
+    """
+        将整全外星人下移并改变它们的方向
+    """
+    for alien in aliens.sprites():
+        alien.rect.y += ai_settings.fleet_drop_speed
+    ai_settings.fleet_direction *= -1
+
+
+def check_aliens_bottom(ai_settings, game_stats, scoreb, screen, ship, aliens, bullets):
+    """检测外星人是否到达屏幕底部"""
+    screen_rect = screen.get_rect()
+    for alien in aliens.sprites():
+        if alien.rect.bottom >= screen_rect.bottom:
+            # 外星人触底爆炸声
+            music.voice_large()
+            # 有外星人到达屏幕后进行像飞船被撞后一样的操作
+            ship_aliens_hit(ai_settings, game_stats, scoreb, screen, ship, aliens, bullets)
+            break
+
+