Re: [wxVTK] Redraw problems with wxVTK and wxMAC: perhaps a solution!

[Mathieu M. <mat...@gm...>]

Sander/Pierre,

  Could one of you send me either a patch or the full cxx source, so I
can apply it. I will not have access to a mac for a while.

Thanks
-Mathieu

On 3/15/07, Sander Niemeijer <nie...@st...> wrote:
> Hi,
>
> I would like to confirm the problem and work around.
>
> I had the same problem using wxWidgets 2.8.1.1 (carbon build), VTK
> 5.0.2 and MacOSX 10.4.9.
>
> For me the problem also appeared when using a wxSplitterWindow.
> However, I only used one part for the VTK window and the other part
> of the splitter contained a panel with some control buttons. When
> resizing (i.e. enlarging the window) the part in the VTK window that
> did not get updated (and contained a background color) was the area
> where the panel with control buttons was _before_ resize.
>
> The workaround with the UpdateGLRegion() did fix the problem (thank
> you Pierre!).
> I only doubt whether this fix is good final solution to the problem.
> To me it seems that something more fundamental is wrong somewhere
> inside either wxWidgets or VTK.
>
> By the way, I also had to add
> ---
> #ifdef __WXMAC__
> #include "vtkCarbonRenderWindow.h"
> #endif
> ---
> to the top of the file for the definition of vtkCarbonRenderWindow.
>
> Best regards,
> Sander
>
> On 19-feb-2007, at 15:21, Pierre Fillard wrote:
>
> > Hi!
> >
> > First of all, thank you Mathieu for providing us with this wx
> > interface
> > to VTK!
> >
> > Since I started using wxWidgets and wxVTK on a MAC, I realized (others
> > might have experienced this also) that the display was sometimes not
> > updated properly. I am using wxMAC 2.8.0, VTK 5.0.2 and MacOSX
> > 10.4.8. I
> > used wxVTK versions from 0.8 to 1.2, the problem remains in all
> > versions.
> >
> > The problem occurs when at least two wxVTK windows are embedded in a
> > window (case of the SplitSample for example).
> >
> > When one slowly resizes it, there is no problem, i.e. everything is
> > repainted correctly. However, when one resizes the window very fast,
> > (for instance when the window is put in full screen mode), then some
> > parts of the wxVTK windows are not redrawn, even worse, the background
> > is painted over the window. The only way to refresh the wxVTK
> > windows is
> > to slowly downsize the frame. I tried to overload the OnPaint event to
> > force a call to Render() or simulate a resizing, nothing worked.
> >
> > It was starting to drive me crazy since the redraw problem was really
> > annoying when one wanted for instance, to put a view in full
> > screen, and
> > then back to normal...
> >
> > I finally found a solution: one needs to call the "UpdageGLRegion()"
> > method of the vtkCarbonRenderWindow (assuming that you're using the
> > Carbon version of wxMAC, I haven't tried the other ports, but they
> > seem
> > to be less complete anyway) during the OnPaint() method of the
> > wxVTKRenderWindowInteractor class. Here is what I put at the end of
> > the
> > OnPaint() method:
> >
> > #ifdef __WXMAC__
> >   vtkCarbonRenderWindow* rwin =
> > vtkCarbonRenderWindow::SafeDownCast(RenderWindow);
> >   if( rwin )
> >   {
> >   rwin->UpdateGLRegion();
> >   }
> > #endif
> >
> > That might not be the most elegant way to bypass this redraw problem,
> > but at least it works. And goodbye the ugly background painted over
> > the
> > VTK windows.
> >
> > I hope this was helpful to some Mac users. Maybe the problem is
> > completely related to my hardware / software version. In this case, I
> > apologize for the inconvenience.
> >
> > Pierre Fillard,
> > INRIA Sophia Antipolis, France.
> > http://www-sop.inria.fr/asclepios/software/MedINRIA.
> >
> >
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-- 
Mathieu