import cv2
import numpy as np 

# mouse callback function

def draw_circle(event, x, y, flags, param):
	if event == cv2.EVENT_LBUTTONDBLCLK:
		cv2.circle(img, (x, y) , 100 , (255,0,0), -1)

#create img and win ,reflect function and win

img = np.zeros((500, 500, 3), np.uint8)
cv2.namedWindow('image')
cv2.setMouseCallback('image',draw_circle)

while (1):
	cv2.imshow('image',img)
	if cv2.waitKey(1)&0xFF == ord('q'):
		break
cv2.destroyAllWindows()