@A-A-SEZEN Thanks, it actually works now

Thank you so much nagesh.

@mrjj
Thank you sir for helping me and direction. I am able to solve this issue by

setting the clipping area properly on graph. Use QWidget::update() instead of QWidget::repaint().

Ok solved

It appears that a GLOBAL surface setInterval overrides the setIntervals I did on my glWidget. Kinda weird that the global one overrides local one if local one was specified, is this a bug ?

format.setSwapInterval(0); QSurfaceFormat::setDefaultFormat(format);

overrides on widget >

QSurfaceFormat format; format.setSwapInterval(0); setFormat(format);

Hi and welcome to devnet,

Since your widgett is called PixmapView then in your CanvaTest class you can use ui->PixmapView ..

Thanks for the advice mrjj. I used the translate functions and the save and restore to ensure that each section has a logical coordinate system that makes sense to it.