python - cv2.polylines gives wrong shape -

i try draw reversed triangle code below,but gives normal triangle, though points give these of reversed triangle! tell me wrong?

import cv2  import numpy np  f=cv2.imread("c:\desktop\image.jpg")  pts = np.array([[195,327],[378,327],[286,144]])  pts = pts.reshape((-1,1,2))  cv2.polylines(f,np.int32([pts]),true,(0,0,255),3)  cv2.namedwindow('img')  cv2.imshow('img', f)  cv2.waitkey()  cv2.destroywindow('img') 

in opencv coordinates start top-left, (0,0) top-left pixel on view.

try pts = np.array([[195,327],[378,327],[286,500]])