[vtkusers] ​SetClientData in python (David Gobbi)

[Andrew Maclean]

David,

When I try this I get:
TypeError: DummyFunc() missing 1 required positional argument: 'data'

I used a slightly different approach in
https://lorensen.github.io/VTKExamples/site/Python/VisualizationAlgorithms/StreamlinesWithLineWidget/


Regards
   Andrew

​
   2. Re:
​​
SetClientData in python (David Gobbi)
>
> ---------- Forwarded message ----------
> From: David Gobbi <david.gobbi at gmail.com>
> To:
> ​​
>  "Serge K." <skab12 at gmail.com>
> Cc: VTK Users <vtkusers at vtk.org>
> Bcc:
> Date: Fri, 10 Nov 2017 11:17:26 -0700
> Subject: Re: [vtkusers] SetClientData in python
> Hi Serge,
>
> The way to do this in Python is to add attributes to your callback
> function.
>
>     def DummyFunc(obj, ev, data):
>         print(ev, data)
>
>
> ​​
> DummyFunc.CallData = whatever
>
>     interactor.AddObserver('LeftButtonPressEvent', DummyFunc)
>
> So the vtkCallbackCommand really isn't needed in Python (and, as you have
> noticed, it really can't be used in Python anyway).
>
>  - David
>
>
>
> On Fri, Nov 10, 2017 at 10:32 AM, Serge K. <skab12 at gmail.com> wrote:
>
>> Hi All,
>>
>> I am playing with MouseEventObserver.py example and I would like to add a
>> ClientData on my callback function. There are many examples in C++ like
>> this one: https://www.vtk.org/Wiki/VTK/Examples/Cxx/Interaction/C
>> lientData
>>
>> However, I do not know how to do that in Python.
>>
>> Indeed, if I create a  vtkCallbackCommand , SetCallBack function does
>> not exist.
>>
>> Any Idea? Thanks for your answer.
>>
>> Serge
>>
>> ps: python36 - vtk 7.1.1
>>
>>
>> ​​
>> #!/usr/bin/env pythonfrom __future__ import print_function
>> import vtksource = vtk.vtkSphereSource()source.SetCenter(0, 0, 0)source.SetRadius(1)source.Update()
>> mapper = vtk.vtkPolyDataMapper()mapper.SetInputConnection(source.GetOutputPort())
>> actor = vtk.vtkActor()actor.SetMapper(mapper)
>> renderer = vtk.vtkRenderer()renderer.SetBackground(1, 1, 1)renderer.AddActor(actor)
>> renwin = vtk.vtkRenderWindow()renwin.AddRenderer(renderer)
>> interactor = vtk.vtkRenderWindowInteractor()interactor.SetInteractorStyle(vtk.vtkInteractorStyleTrackballCamera())interactor.SetRenderWindow(renwin)
>> def DummyFunc(obj, ev, my_obj_2):
>>     print(obj, my_obj_2)
>>
>> # obj_2 = vtk.whatever()# How do I pass my obj_2 ? interactor.AddObserver('LeftButtonPressEvent', DummyFunc)interactor.Initialize()interactor.Start()
>>
>>
>
>
-- 
___________________________________________
Andrew J. P. Maclean

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