mouse_events.py

import numpy as np
import cv2


# def circle(event, x, y, flags, param):
#     if event == cv2.EVENT_LBUTTONDBLCLK:#double click draws a circle
#         cv2.circle(img, (x, y), 100, (200, 0, 255), -1)
#         cv2.imshow('image', img)


# img = np.zeros((512, 512, 3), np.uint8)
# cv2.namedWindow('image')
# cv2.imshow('image', img)
# while(1):

#     cv2.setMouseCallback('image', circle)
#     k = cv2.waitKey(0)
#     if k % 256 == 27:
#         print("Aborting...")
#         break


# cv2.destroyAllWindows()

drawing = False  # true if mouse is pressed
mode = True  # if True, draw rectangle. Press 'm' to toggle to curve
ix, iy = -1, -1

# mouse callback function


def draw_circle(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), -1)
            else:
                cv2.circle(img, (x, y), 5, (0, 0, 255), -1)

    elif event == cv2.EVENT_LBUTTONUP:
        drawing = False
        if mode == True:
            cv2.rectangle(img, (ix, iy), (x, y), (0, 255, 0), -1)
        else:
            cv2.circle(img, (x, y), 5, (0, 0, 255), -1)


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

while(1):
    cv2.imshow('image', img)
    k = cv2.waitKey(1) & 0xFF
    if k == ord('m'):
        mode = not mode
    elif k == 27:
        break

cv2.destroyAllWindows()