[vtkusers] Bug in vtkTextActor for accentuated characters?

[Roger Bramon Feixas]

Hi Pof,

Since VTK 5.2.0, vtkTextActor is rendered using glyphs instead of OpenGL. I
also had that problem but it was solved in that commit
http://vtk.org/gitweb?p=VTK.git;a=commit;h=331a44656276882766248c1f8e338434b40226efwhen
UTF8 text rendering was enabled. It's after VTK 5.6 was released.

On the other hand, I suppose you still have problems rendering text with
shadow, as you reported in that issue: http://vtk.org/Bug/view.php?id=9618.
I tried to solve it and I attached a patch in that issue waiting for
feedback. It would be wonder if you could test it and let me know if it
works well.

Thanks,

Roger


On Fri, Sep 3, 2010 at 2:12 PM, Pof <jd379252 at gmail.com> wrote:

> Hi all,
>
> I am having trouble displaying accentuated characters in vtkTextActor with
> vtk5.6.0 under MS-VC++2005.
> Here below is an exemple that reproduces the problem, by printing the same
> string than contains accents "é,è,à".
> When I run this small prog, as a result I obtain that accentuated
> characters (é,è...) are :
> - correctly displayed when used in a vtkScalarBarActor title,
> - not displayed when incorporated in vtkTextActor.
>
> Any idea where does this come from and how to solve it?
>
> As an additional comment, this used to work correctly under vtk5.0.x, it is
> only broken from vtk5.2.x up to vtk5.6.0.
>
> Thanks
> JD
>
>
> //////////////////////////////////////////////////////
> ////////////////// vtkTextActor bug //////////////////
> //////////////////////////////////////////////////////
> #include "vtkActor.h"
> #include "vtkRenderer.h"
> #include "vtkRenderWindow.h"
> #include "vtkRenderWindowInteractor.h"
> #include "vtkCamera.h"
> #include "vtkTextProperty.h"
> #include "vtkTextActor.h"
> #include "vtkActor2D.h"
> #include "vtkLookupTable.h"
> #include "vtkScalarBarActor.h"
>
> int main()
> {
>     // Tested string
>     char text[] = "Test: é, è, à";
>
>     // Create an example text actor
>     vtkTextActor *textActor = vtkTextActor::New();
>     textActor->SetInput(text);
>
> textActor->GetPositionCoordinate()->SetCoordinateSystemToNormalizedViewport();
>     textActor->SetPosition(0.50,0.50);
>     textActor->GetTextProperty()->SetFontSize(30);
>     textActor->GetTextProperty()->SetJustificationToCentered();
>     textActor->GetTextProperty()->SetColor(1, 0, 0);
>
>     // Create a Lut
>     vtkLookupTable *Lut = vtkLookupTable::New();
>     Lut->SetHueRange (160.0/240.0, 0.0);
>     Lut->SetSaturationRange (1.0, 1.0);
>     Lut->SetValueRange (1.0, 1.0);
>     Lut->SetTableRange (0,100);
>     Lut->Build();
>
>     // Create a ScalarBarActor
>     vtkScalarBarActor *scalarBar = vtkScalarBarActor::New();
>     scalarBar->SetTitle(text);
>     scalarBar->SetLookupTable(Lut);
>     scalarBar->SetHeight(0.5);
>     scalarBar->SetWidth(0.1);
>     scalarBar->SetPosition(0.10,0.01);
>     scalarBar->SetPosition2(0.80,0.1);
>     scalarBar->SetOrientationToHorizontal();
>
>     // Create the graphics structure
>     vtkRenderer *ren = vtkRenderer::New();
>     vtkRenderWindow *renWin = vtkRenderWindow::New();
>     renWin->AddRenderer(ren);
>     renWin->SetSize(600, 600);
>     vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
>     iren->SetRenderWindow(renWin);
>
>     // Add the actors to the renderer, set the background and size
>     ren->AddActor(textActor);
>     ren->AddActor(scalarBar);
>     ren->SetBackground(0.1, 0.2, 0.4);
>     ren->ResetCamera();
>     ren->GetActiveCamera()->Zoom(1.0);
>     renWin->Render();
>
>     // Starts the event loop
>     iren->Start();
>
>     // Do some cleaning
>     textActor->Delete();
>     Lut->Delete();
>     scalarBar->Delete();
>     ren->Delete();
>     renWin->Delete();
>     iren->Delete();
>
>     return 0;
> }
>
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