[vtkusers] vtkCaptionActor2D not filling its prop correctly

[Tiago Nobrega]

My apologies (again): Looks like we were previously on version 6.2, and not
6.3 as I originally thought. I see that there were a few DPI-related
changes in version 6.3, so I'm investigating those now. I'll report back as
soon as I have a conclusion.

Thank you and sorry for the noise,

Tiago Nobrega

On Fri, Sep 23, 2016 at 8:27 AM, Tiago Nobrega <tigarmo at gmail.com> wrote:

> Hello,
>
> I apologize for not reading the guidelines properly and submitting an
> issue on Gitlab before trying the mailing list. Here's my issue:
>
> We are in the process of updating VTK from 6.3 to 7.0 and some of our
> tests are failing because text actors are being rendered differently. This
> usually happens when we update the library (minor differences are to be
> expected) but in this particular case it looks like a regression.
>
> The following code (python):
>
> ```python
> import vtk
>
> ren1 = vtk.vtkRenderer()
> renWin = vtk.vtkRenderWindow()
> renWin.AddRenderer(ren1)
> iren = vtk.vtkRenderWindowInteractor()
> iren.SetRenderWindow(renWin)
>
> prop_1 = vtk.vtkCaptionActor2D()
> prop_1.SetCaption('Hello')
> prop_1.SetAttachmentPoint((-0.1, 0.0, 0.0))
>
> prop_1.GetCaptionTextProperty().Modified()
>
> ren1.AddActor(prop_1)
> ren1.SetBackground(0, 0, 0)
> ren1.GetActiveCamera().SetFocalPoint(0,0,0)
> ren1.GetActiveCamera().SetPosition(1,0,0)
> ren1.GetActiveCamera().SetViewUp(0,0,1)
> ren1.ResetCamera()
> renWin.SetSize(500, 500)
>
> iren.Start()
> ```
>
> ... generates two different renderings depending on the version, as shown
> on the following image:
>
> http://imgur.com/w8VXM8z
>
> The left side is VTK 6.3, and the right one is 7.0. Both ran on a Windows
> 10 machine, but the issue was replicated on our Linux boxes too. In all
> cases we're still using the old OpenGL backend and not the new OpenGL2 one.
> The behavior in version 6.3 seems more "correct" in the sense that the text
> is more fully filling up the rectangle, with the default scaling mode being
> to scale to the prop. I've investigated the commit history for the classes
> that seem relevant - vtkCaptionActor2D, vtkTextActor, vtkTextProperty, etc
> - but nothing stood out as possible "culprits".
>
> Let me know if you need further info or clarifications. Thanks.
>
> Tiago Nobrega
>
>
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