Zooming functionalities for whole qopenglwidget window

[Md Saif Khan]

Hello,
I am working using qopenglwidget in qt. I want to add zoom in and out functionalities for qopenglwidget window so that the whole widget window can be zoomed in or out. I was searching in internet but did not get much resource. Can anyone help me so that i can start working for zoom in and out functionalities?

[JoeCFD]

http://goldsequence.blogspot.com/2016/04/how-to-zoom-in-in-opengl-qt.html