ADD file via upload

background.py

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+from typing import Any
+
+import pygame
+from pygame.sprite import Sprite
+
+
+class BackGround(Sprite):
+    def __init__(self, ai_game):
+        super().__init__()
+        # 屏幕设置
+        self.screen = ai_game.screen
+        self.screen_rect = ai_game.screen.get_rect()
+        self.settings = ai_game.settings
+
+        # 获取背景
+        self.image = pygame.image.load("resource/image/space-2.png").convert()
+        self.image = pygame.transform.scale(self.image, (self.settings.screen_width, self.settings.screen_height))
+        self.rect = self.image.get_rect()
+        self.rect.bottom = self.screen_rect.bottom
+        self.rect_height = self.rect.height
+        # 背景移动设置
+        self.ready_to_mov = 0
+
+    def update(self, *args: Any, **kwargs: Any) -> None:
+        if self.ready_to_mov == 0:
+            self.rect.bottom += self.settings.bg_speed
+            if self.rect.top >= self.screen_rect.bottom:
+                self.rect.bottom = self.screen_rect.bottom - self.rect_height