Draw lines Using Mouse Click Event.py

import cv2
import numpy as np

#events = [i for i in dir(cv2) if 'EVENT' in i]
#print(events)

def click_event(event,x,y,flags,param):
    if event == cv2.EVENT_LBUTTONDOWN:
        cv2.circle(img,(x,y),3,(255,0,0),-1)
        points.append((x,y))
        if len(points) >= 2:
            cv2.line(img,points[-1],points[-2],(0,255,0),1)
        cv2.imshow("image", img)
img = cv2.imread("c:/Lenna.jpg",1)
cv2.imshow("image",img)
points = []
cv2.setMouseCallback('image',click_event)
cv2.waitKey(0)