[vtk-developers] Wrapping vtkVariant and other special types in Python

[Berk Geveci]

Hi David,

I apologize if this was already answered. Are you mapping vtkVariant
to a new Python class or a native Python type? If it is a new
class/type, is it compatible with other types? For example, if the
variant contains an int, can I do variant + 5?

-berk

On Sun, May 2, 2010 at 5:21 PM, David Gobbi <david.gobbi at gmail.com> wrote:
> As suggested by Brad, I've made a fork of VTK on github and pushed my
> wrapper changes to it:
> http://github.com/dgobbi/VTK
>
> This version of VTK wraps vtkVariant for Python, and should be capable
> of wrapping many other special types as well.  In
> Common/CMakeLists.txt you can see where I've added a "WRAP_SPECIAL"
> property for vtkVariant and vtkTimeStamp.  Other classes can be given
> the WRAP_SPECIAL property as well, and I encourage people to try.
> Note that after adding the WRAP_SPECIAL property to a class, you'll
> have to play with BTX/ETX.
>
> I haven't started in on the vtkStdString fixes yet.  It is a separate
> issue in a way, because vtkStdString and vtkUnicodeString are
> "fundamental types" as far as the wrappers are concerned, while
> vtkVariant is merely a "special type."  Apologies for using my own
> made-up vocabulary here. In any case, if I fix the vtkStdString
> wrapping, it will be fixed across all the wrapper languages, not just
> python.
>
> In addition to special type support for python and massive cleanup of
> vtkWrapPython.c, I've also changed the way that overloaded functions
> are resolved.  The python wrappers used to try each overload in turn
> until one of them worked.  Now the python wrappers find the overload
> that is the best match to the arguments.
>
> And one more item before I head outdoors to enjoy what's left of the
> weekend: I've finally pushed the WrapVTK project out to github,
> http://github.com/dgobbi/WrapVTK, which can be used to generate XML
> descriptions of the VTK classes.  WrapVTK will be used as the basis
> for the next version of the SimVTK (Simulink/VTK) project.
>
> Any feedback is appreciated.
>
>   David
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