import cv2
import numpy as np

drawing = False

mode = True

ix , iy = -1,-1

def draw(event, x,y, flags, param):

    global ix,iy,drawing,mode

    if event == cv2.EVENT_LBUTTONDOWN:
        drawing = True
        ix,iy = x,y

    elif event == cv2.EVENT_MOUSEMOVE:
        if drawing == True:
            if mode == True:
                cv2.rectangle(img, (ix,iy),(x,y),(0,255,0),2)
            else:
                cv2.circle(img, (x,y), 5, (0,0,255),2)

    elif event == cv2.EVENT_LBUTTONUP:
        drawing = False
        if mode == True:
            cv2.rectangle(img, (ix,iy),(x,y),(0,255,0),2)
        else:
            cv2.circle(img, (x,y), 5, (0,0,255),2)
        
    

img = np.zeros((512,512,3),np.uint8)
cv2.namedWindow('image')
cv2.setMouseCallback('image', draw)

while(1):
    cv2.imshow('image',img)

    k = cv2.waitKey(1) &0xFF

    if k == ord('m'):
        mode = not mode
    elif k==27:
        break

cv2.destroyAllWindows()
