From c535b5014a7e98bc95bf5887f9ced391e34e9f89 Mon Sep 17 00:00:00 2001
From: 206530235 <1828358204@qq.com>
Date: Thu, 24 Jun 2021 11:17:40 +0800
Subject: [PATCH] =?UTF-8?q?=E4=B8=8A=E4=BC=A0=E6=96=87=E4=BB=B6=E8=87=B3?=
 =?UTF-8?q?=20''?=
MIME-Version: 1.0
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---
 alien.py | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 alien.py

diff --git a/alien.py b/alien.py
new file mode 100644
index 0000000..e0041f2
--- /dev/null
+++ b/alien.py
@@ -0,0 +1,44 @@
+import pygame
+from pygame.sprite import Sprite
+
+
+class Alien(Sprite):
+    """表示单个外星人的类"""
+
+    def __init__(self, ai_settings, screen):
+        """初始化外星人并设置其他位置"""
+
+    super(Alien, self).__init__()
+    self.screen = screen
+    self.ai_settings = ai_settings
+
+    # 加载外星人图像，并设置其rect属性
+    self.image = pygame.image.load('images/alien.bmp')
+    self.rect = self.image.get_rect()
+
+    # 每个外星人最初都在屏幕左上角附近
+    self.rect.x = self.rect.width
+    self.rect.y = self.rect.height
+
+    # 存储外星人的准确位置
+    self.x = float(self.rect.x)
+
+    def blitme(self):
+        """在指定位置绘制外星人"""
+
+    self.screen.blit(self.image, self.rect)
+
+    def check_edges(self):
+        """如果外星人位于屏幕边缘，就返回True"""
+
+    screen_rect = self.screen.get_rect()
+    if self.rect.right >= screen_rect.right:
+        return True
+    elif self.rect.left <= 0:
+        return True
+
+    def update(self):
+        """向右移动外星人"""
+
+    self.x += (self.ai_settings.alien_speed_factor * self.ai_settings.fleet_direction)
+    self.rect.x = self.x
\ No newline at end of file