[vtk-developers] Interaction with color/opacity editors in vtkChartXY broken on retina display

[Utkarsh Ayachit]

Here's a commit that hopefully removes the need for your `showEvent`
override.
https://gitlab.kitware.com/vtk/vtk/merge_requests/2885

Can you give it a try please?

Thanks
Utkarsh

On Mon, May 29, 2017 at 11:39 AM, Elvis Stansvik <
elvis.stansvik at orexplore.com> wrote:

> 2017-05-29 17:34 GMT+02:00 Utkarsh Ayachit <utkarsh.ayachit at kitware.com>:
> > I suspect there's a bug in Qt when it comes to reparenting
> QOpenGLWidget. I
> > can reproduce an issue with ParaView on linux when I simply undock the
> Color
> > Map Editor and then redock it. The Color/Opacity widgets stay black.
> Looking
> > at the code, I see this [1] happens when the dock widget is docked back
> into
> > the main window. As expected the OpenGL context is destroyed, and
> > QVTKOpenGLWIdget correctly does the cleanup. But the QVTKOpenGLWidget
> never
> > gets a follow on paintGL call (unless I mouse over to resize the dock
> panel
> > manually). Thus QVTKOpenGLWidget new repaints into the newly minted
> > OpenGLContext/FBO resulting in a black widget.
>
> Ah, in my case I don't think there's reparenting involved though.
>
> My problem was that the interactor's size was never updated to cover
> the render window when it was initially shown (I think), see my other
> mail just now.
>
> Gotto head home, but will debug more tomorrow.
>
> Elvis
>
> >
> > Utkarsh
> >
> > [1]
> > https://code.woboq.org/qt5/qtbase/src/widgets/kernel/
> qopenglwidget.cpp.html#1418
> >
> >
> > On Mon, May 29, 2017 at 11:06 AM, Marcus D. Hanwell
> > <marcus.hanwell at kitware.com> wrote:
> >>
> >> On Mon, May 29, 2017 at 9:32 AM, Elvis Stansvik
> >> <elvis.stansvik at orexplore.com> wrote:
> >> >
> >> > 2017-05-29 15:26 GMT+02:00 Sebastien Jourdain
> >> > <sebastien.jourdain at kitware.com>:
> >> > > You need to set the size on the interactor.
> >> >
> >> > Ah, how do I do that? (sorry for being a bit dumb)
> >> >
> >> > I've been scouring over the PV code, and I can't see that it does
> >> > anything special with its interactor. It seems to just hook it up:
> >> >
> >> I assume you are using QVTKOpenGLWidget, we use this directly in
> >> Tomviz for a few charts that control color/opacity too. This should be
> >> handled in the QVTKOpenGLWidget, but it is possible an initialization
> >> bug has crept in. I have noticed that ParaView often doesn't see this
> >> issues as much due to resizing Qt widgets several times on startup, I
> >> will see if I can get some time to test the latest Tomviz (we had this
> >> working, but I haven't been tracking VTK master as closely these last
> >> few weeks).
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