ship

ship.py

@@ -11,4 +11,20 @@ class Ship(Sprite):
 
         self.image = pygame.image.load('images/ship.png')
         self.rect = self.image.get_rect()
-        self.screen_rect = screen.get_rect()
+        self.screen_rect = screen.get_rect()
+
+        # 将每艘新飞船放在屏幕底部中央
+        self.rect.centerx = self.screen_rect.centerx
+        self.rect.bottom = self.screen_rect.bottom
+
+        # 在飞船的属性center中存储小数值
+        self.centerx = float(self.rect.centerx)
+        self.centery = float(self.rect.centery)
+
+        # 移动标志
+        self.moving_right = False
+        self.moving_left = False
+        self.moving_up = False
+        self.moving_down = False
+
+