python_opencv用线段画封闭矩形的实例


						如下所示：





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

  global ix,iy,drawing,mode,start_x,start_y



  if event == cv2.EVENT_LBUTTONDOWN:

    if drawing == False:

      start_x, start_y = x,y

      ix,iy = x,y

      drawing = True

    elif drawing == True:

      cv2.line(img,(ix,iy),(x,y),(0,255,0),3)

      ix, iy = x, y

    print(drawing)

  elif event == cv2.EVENT_MBUTTONDOWN:

    drawing = False



    cv2.line(img, (ix, iy), (start_x, start_y), (0, 255, 0), 3)

    print(drawing)





  #

  # elif event == cv2.EVENT_RBUTTONUP:

  #   cv2.line(img,(ix,iy),(x,y),(0,255,0),3)

# Next we have to bind this mouse callback function to OpenCV # # window. In the main loop, we should set a keyboard binding for

# key ‘m' to toggle between rectangle and circle.

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'): # 切换模式

    mode = not mode

  elif k == 27:

    break



cv2.destroyAllWindows()







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