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bazi.py

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+import pygame
+from pygame.sprite import Sprite
+
+class Bazi(Sprite):
+    """创建一个代表靶子的类."""
+
+    def __init__(self, ai_settings, screen):
+        """初始化靶子，并设置其起始位置"""
+        super(Bazi, self).__init__()
+        self.screen = screen
+        self.ai_settings = ai_settings
+
+        # 加载外来图像，并设置其rect属性
+        self.image = pygame.image.load('images/bazi.png')
+        self.rect = self.image.get_rect()
+
+        # 在屏幕左上角启动每个新靶子
+        self.rect.x = self.rect.width
+        self.rect.y = self.rect.height
+
+        # 存储靶子的准确位置
+        self.x = float(self.rect.x)
+        
+    def check_edges(self):
+        """如果靶子在屏幕边缘，则返回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):
+        """靶子的移动（向左或者向右）"""
+        self.x += (self.ai_settings.bazi_speed_factor *
+                        self.ai_settings.fleet_direction)
+        self.rect.x = self.x
+
+    def blitme(self):
+        """在当前位置绘制靶子"""
+        self.screen.blit(self.image, self.rect)