Wrong OpenGL viewport of widget inside QDockWidget

[Jaime02]

Hello. I am drawing stuff on a widget which is inside a QDockWidget and has a 1:1 squared aspect ratio. However, the drawing surface is not properly resized. When the size of the widget is equal to its size hint, the drawing is done properly:

But when it is smaller or bigger, it is not properly drawn:

or

Full source code: https://github.com/Jaime02/Dibujo-tecnico-Cpp

resizeEvent (this keeps a 1:1 aspect ratio):

void Renderer::resizeEvent(QResizeEvent *event){
    if (this->width() > this->height()){
        this->resize(this->height(), this->height());
    } else {
        this->resize(this->width(), this->width());
    }
}

[SGaist]

Hi and welcome to devnet,

You should add which version of Qt you are using as well as platform you run that code on.

[Jaime02]

Hello. Thanks for answering ❤
Qt version: 5.14.2 MinGW 64-bits
Platform: Windows 10, updated.
I have a Python version which works fine, but the c++ version does not.

[SGaist]

Does the python version use the same version of Qt ?

[Jaime02]

@SGaist Yes it does

[Jaime02]

I have created a question here: https://stackoverflow.com/questions/62290688/wrong-opengl-viewport-of-widget-inside-qdockwidget I have included gifs and a Python MRE

[Jaime02]

I found the problem:
There was missing a QOpenGLWidget::resizeEvent(event); statement at resizeEvent.