import cv2
import numpy as np
img = np.zeros((480, 640, 3), np.uint8)
startpos = (0, 0)
curshape = 0
def mouse_callback(event, x, y, flags, userdata):
global startpos, curshape
if event == cv2.EVENT_LBUTTONDOWN:
startpos = (x, y)
elif event == cv2.EVENT_LBUTTONUP:
if curshape == 0:
cv2.line(img, startpos, (x, y), (0,0,255), 3)
elif curshape == 1:
cv2.rectangle(img, startpos, (x, y), (0,0,255), 3)
elif curshape == 2:
cv2.rectangle(img, startpos, (x, y), (0,0,255), 3)
cv2.namedWindow('drawshape', cv2.WINDOW_NORMAL)
cv2.resizeWindow('drawshape', 800, 600)
cv2.setMouseCallback('drawshape', mouse_callback)
while True:
cv2.imshow('drawshape', img)
key = cv2.waitKey(1)
if key == ord('q'):
break
elif key == ord('l'):
curshape = 0
elif key == ord('r'):
curshape = 1
elif key == ord('c'):
curshape = 2
cv2.destroyAllWindows()
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