add doodle+fix1

data/1.OpenCV初阶/1.OpenCV基础/4.IO与GUI/doodle.md

@@ -49,8 +49,7 @@ class Painter:
         # TODO(You): 请正确实现画板事件响应，完成功能
 
     def clean(self):
-        cv.rectangle(self.img, (0, 0),
-                     (self.height, self.width), (0, 0, 0), -1)
+        cv.rectangle(self.img, (0, 0), (self.height, self.width), (0, 0, 0), -1)
 
     def begin_draw_rectangle(self, pos1, pos2):
         if self.color is None: