From 9e72d2db22d0328cd705cf0b83d4f00db931d377 Mon Sep 17 00:00:00 2001
From: 206530225 <1225859578@qq.com>
Date: Wed, 23 Jun 2021 13:16:15 +0800
Subject: [PATCH] =?UTF-8?q?=E6=9B=B4=E6=96=B0=20'Alien=5FInvasion.py'?=
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---
 Alien_Invasion.py | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/Alien_Invasion.py b/Alien_Invasion.py
index fba25b3..251a1f6 100644
--- a/Alien_Invasion.py
+++ b/Alien_Invasion.py
@@ -55,6 +55,28 @@ class AlienInvasion: # 管理游戏资源和行为的类11
         available_space_x = self.settings.screen_width - (2 * alien_width)
         number_aliens_x = available_space_x // (2 * alien_width)
         
+
+
+        # 计算屏幕可容纳多少行外星人
+        ship_height = self.ship.rect.height
+        available_space_y = (self.settings.screen_height -
+                                 (3 * alien_height) - ship_height)
+        number_rows = available_space_y // (2 * alien_height)
+
+        # 创建外星人群
+        for row_number in range(number_rows):
+            for alien_number in range(number_aliens_x):
+                self._create_alien(alien_number, row_number)
+
+    def _create_alien(self, alien_number, row_number):
+        """创建一个外星人并将其放在当前行"""
+        alien = Alien(self)
+        alien_width,alien_height = alien.rect.size
+        alien.x = alien_width + 2 * alien_width * alien_number
+        alien.rect.x = alien.x
+        alien.rect.y = alien.rect.height + 2 * alien.rect.height * row_number
+        self.aliens.add(alien)
+
     def run_game(self): # 开始游戏主循环
         while True:
             self._check_events()