Shulou(Shulou.com)06/01 Report--

This article mainly shows you "opencv how to achieve mouse action GUI", the content is easy to understand, clear, hope to help you solve doubts, the following let the editor lead you to study and learn "opencv how to achieve mouse action GUI" this article.

Show events supported by opencv:

Import cv2 as cvevents = [i for i in dir (cv) if 'EVENT' in I] print (events) # the print result is as follows: "" [' EVENT_FLAG_ALTKEY', 'EVENT_FLAG_CTRLKEY',' EVENT_FLAG_LBUTTON', 'EVENT_FLAG_MBUTTON',' EVENT_FLAG_RBUTTON', 'EVENT_FLAG_SHIFTKEY',' EVENT_LBUTTONDBLCLK', 'EVENT_LBUTTONDOWN',' EVENT_LBUTTONUP', 'EVENT_MBUTTONDBLCLK' 'EVENT_MBUTTONDOWN',' EVENT_MBUTTONUP', 'EVENT_MOUSEHWHEEL',' EVENT_MOUSEMOVE', 'EVENT_MOUSEWHEEL',' EVENT_RBUTTONDBLCLK', 'EVENT_RBUTTONDOWN',' EVENT_RBUTTONUP'] ""

Console output result:

Copyright (C) Windows PowerShell Microsoft Corporation. All rights reserved. It took 879 milliseconds to try a new cross-platform PowerShell https://aka.ms/pscore6 to load personal and system profiles. (base) PS C:\ Users\ chenxuqi\ Desktop\ News4cxq\ test4cxq\ opencv4cxq > conda activate ssd4pytorch2_2_0 (ssd4pytorch2_2_0) PS C:\ Users\ chenxuqi\ Desktop\ News4cxq\ test4cxq\ opencv4cxq > &'D:\ Anaconda3\ envs\ ssd4pytorch2_2_0\ python.exe''c:\ Users\ chenxuqi\ .vscode\ extensions\ ms-python.python-2020.12.424452561\ pythonFiles\ lib\ python\ debugpy\ launcher' '57123' -'c:\ Users\ Chenxuqi\ Desktop\ News4cxq\ test4cxq\ opencv4cxq\ test7.py' ['EVENT_FLAG_ALTKEY' 'EVENT_FLAG_CTRLKEY', 'EVENT_FLAG_LBUTTON',' EVENT_FLAG_MBUTTON', 'EVENT_FLAG_RBUTTON',' EVENT_FLAG_SHIFTKEY', 'EVENT_LBUTTONDBLCLK',' EVENT_LBUTTONDOWN', 'EVENT_LBUTTONUP',' EVENT_MBUTTONDBLCLK', 'EVENT_MBUTTONDOWN',' EVENT_MBUTTONUP', 'EVENT_MOUSEHWHEEL',' EVENT_MOUSEMOVE', 'EVENT_MOUSEWHEEL',' EVENT_RBUTTONDBLCLK', 'EVENT_RBUTTONDOWN' 'EVENT_RBUTTONUP'] (ssd4pytorch2_2_0) PS C:\ Users\ chenxuqi\ Desktop\ News4cxq\ test4cxq\ opencv4cxq >

Draw small blue dots:

Import numpy as npimport cv2 as cv# mouse callback functiondef draw_circle (event,x,y,flags,param): if event = = cv.EVENT_LBUTTONDBLCLK:cv.circle (img, (x image-LinMaZi' y), 10, (255 image-LinMaZi' 0),-1) # Create a black image, a window and bind the function to windowimg = np.zeros ((512 heroin 512), np.uint8) cv.namedWindow ('image-LinMaZi') # create a window and specify the name cv.setMouseCallback (' image-LinMaZi' Draw_circle) # set the mouse handle for the specified window while True:cv.imshow ('image-LinMaZi',img) if cv.waitKey (20) & 0xFF = = 27: # press the Esc key to exit the program breakcv.destroyAllWindows ()

Screenshot of the running result of the program:

Draw a rectangle or circle:

Import numpy as npimport cv2 as cvdrawing = False # true if mouse is pressed # is used to indicate whether the current left mouse button remains pressed mode = True # if True, draw rectangle. Press 'm'to toggle to curveix,iy =-1 the position of the mouse when the left button was pressed # mouse callback functiondef draw_circle_rectangle (event,x,y,flags,param): global ix,iy,drawing,modeif event = = cv.EVENT_LBUTTONDOWN:drawing = Trueix,iy = xmeme Yelif event = = cv.EVENT_MOUSEMOVE:if drawing = = True:if mode = = True:cv.rectangle (img, (ix,iy), (xMague y), (0m255Power0),-1) else:cv.circle (img, (xmemy) 5, (0np.zeros 0255),-1) elif event = = cv.EVENT_LBUTTONUP:drawing = Falseif mode = = True:cv.rectangle (img, (ix,iy), (xreco y), (0pee 255),-1) else:cv.circle (img, (x), 5, (0255),-1) elif event = = cv.EVENT_RBUTTONDOWN:mode = not modeimg = np.zeros ((512, 512), np.uint8) cv.namedWindow ('LinMaZi') cv.setMouseCallback (' LinMaZi') Draw_circle_rectangle) while True:cv.imshow ('LinMaZi',img) k = cv.waitKey (1) & 0xFFif k = = ord (' m') or k = = ord ('M'): mode = not modeelif k = = 27:breakcv.destroyAllWindows ()

Screenshot of the running result of the program:

The above is all the contents of the article "how to achieve mouse action GUI in opencv". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.