Open GL - Drawing A square by clicking a button

[Jisha]

Hi,
I am a very beginner in openGL. What I need is to create a button and on clicking that I should be able to draw a square as we do in Microsoft Paint program.
Thanks,
Jisha

[mrjj]

Hi and welcome to the forums.
You can start by getting to know
https://doc.qt.io/qt-5/qtgui-openglwindow-example.html
as that is the minimum setup you need with shaders etc to show something/anything.

Then step 2 would to modify code to draw recatangle and then step 3
is trying to do it with the mouse if that what you mean by "like in Ms Paint"

You will need some understanding of openGL and basic elements like vertices etc