[vtkusers] How to tune the line with of vtkProperty2D

[Ken Martin]

It sounds like an openGL driver issue.  What version of VTK are you using
and is it built with the OPenGL1 or OpenGL2 backend? What GPU is on the
system you are using?

Assuming you are using a recent VTK with OpenGL2 backend my guess is that
your hardware is saying it can draw wide lines up to 7.5 pixels (though it
seems not to), beyond that VTK is having to render the wide lines itself.
That would be my guess. If you are using a recent VTK with the OPenGL2
backend you can test this by modifying the HaveWideLines method in
Rendering/OpenGL2/vtgkOpenGLPolyDataMapper2D.cxx

change

    return !(renWin &&
      renWin->GetMaximumHardwareLineWidth() >=
actor->GetProperty()->GetLineWidth());

to

    return true;



On Mon, Aug 22, 2016 at 9:10 PM, Liu_tj <tjlp at netease.com> wrote:

> Hi,
>
> I use vtkAngleWidget to measure angle. I want to tune the line width of
> the angle leaders and arc. Below is my C# code:
>
>             m_angleWidget = vtkAngleWidget.New();
>             m_angleWidget.SetInteractor(m_renderWin.GetInteractor());
>             m_angleWidget.PlacePointEvt += new vtkObject.
> vtkObjectEventHandler(AngleWidget_PlacePointEvt);
>             m_angleRep = vtkAngleRepresentation2D.New();
>             m_angleRep.GetRay1().GetProperty().SetColor(0.0, 1.0, 0.0);
>             m_angleRep.GetRay1().GetProperty().SetLineWidth(8.0f);
>             m_angleRep.GetRay2().GetProperty().SetColor(0.0, 1.0, 0.0);
>             m_angleRep.GetRay2().GetProperty().SetLineWidth(8.0f);
>             m_angleRep.GetArc().GetProperty().SetColor(0.0, 1.0, 0.0);
>             m_angleRep.GetArc().GetProperty().SetLineWidth(8.0f);
>             m_angleRep.GetArc().GetLabelTextProperty().SetColor(0.0, 0.0,
> 1.0);
>             m_angleWidget.SetRepresentation(m_angleRep);
>
> If I call SetLineWidth with 5.0f, 6.0f, 7.0f and 7.5f, I get the same
> effect as 1.jpg; if I call SetLineWidth with 8.0f, the effect is as 2.jpg.
> For me, the line in 1.jpg is too slim, the line in 2.jpg is too wide, how
> to tune it?
>
> Thanks
> Liu Peng
>
>
>
>
>
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-- 
Ken Martin PhD
Chairman & CFO
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065
518 371 3971

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