python_opencv用线段画封闭矩形的实例_Python

python_opencv用线段画封闭矩形的实例

2021-04-25 00:51嗨小方 Python

今天小编就为大家分享一篇python_opencv用线段画封闭矩形的实例，具有很好的参考价值，希望对大家有所帮助。一起跟随小编过来看看吧

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()