[vtkusers] vtkDistanceWidget and vtkCanvas

[Sebastien Jourdain]

Hi Marco,

keep the list in the loop so other could benefit from our discussion.

Moreover, I'm sure you are still missing what I'm saying, but as I
haven't done such thing in a while I can not tell you exactly how to
do it, unless I do it myself.

Seb

On Wed, Jan 18, 2012 at 11:30 AM, Marco Sambin <m.sambin at gmail.com> wrote:
> Hi Seb,
>
> thank you for your message.
>
> Actually, it looks like there is no PlaceWidget() call in vtkDistanceWidget.
> I think the job of adding the appropriate actor(s) to the renderer is
> carried out by the .On() call on the widget (corresponding to
> .SetEnabled(1)). Am I correct?
>
> In any case, I am quite convinced I have found a (strange) issue in
> VTK (I am using a nightly build dated 2011.12.15, Win 64-bit): don't
> ask me why, but the vtkDistanceWidget seems not to work in vtkCanvas
> when VTK's Java auto garbage collector is enabled.
>
> I attach a reproducible test case demonstrating the issue.
> Maybe it could help you (VTK team) in fixing a possible bug.
>
> Best regards,
>
> Marco Sambin
>
>
> 2012/1/18 Sebastien Jourdain <sebastien.jourdain at kitware.com>:
>> Hi Marco,
>>
>> I reply directly in your comment.
>>
>> On Wed, Jan 18, 2012 at 5:06 AM, Marco Sambin <m.sambin at gmail.com> wrote:
>>> Hi Seb,
>>>
>>> first of all, thanks for your reply.
>>>
>>> What do you mean by "add your widget actor into the renderer"?
>>> It is my understanding that calling "SetInteractor(iren)" on the
>>> vtkDistanceWidget should be enough to see it working on screen. Am I
>>> correct, or I am missing some calls?
>>
>> Yes, you are missing something, the interactor is needed so the widget
>> could interpret the user interaction (mouse), but this not change the
>> content of your 3d scene... Therefore, you still need to add
>> "something" to your renderer and even size your widget in the scene.
>> (PlaceWidget)
>>
>> For more informations, you can look at that :
>> http://www.vtk.org/Wiki/VTK/Examples/Cxx#Widgets
>> and http://www.vtk.org/Wiki/VTK/Examples/Java
>>
>> Hope this could help,
>>
>> Seb
>>
>>>
>>> Regarding the camera, well, I actually make a call to
>>> GetRenderer().ResetCamera() on my vtkCanvas, but since the
>>> vtkDistanceWidget is interaction-driven, shouldn't it appear in any
>>> case in the position where I am pressing my mouse (hence, within the
>>> viewing range of the camera)?
>>> In any case, calling ResetCamera() before or after I pressed my mouse
>>> buttons does not show anything.
>>>
>>> Do you have further suggestions?
>>>
>>> Thanks again for your time.
>>>
>>> Regards,
>>>
>>> Marco
>>>
>>>
>>> 2012/1/17 Sebastien Jourdain <sebastien.jourdain at kitware.com>:
>>>> Just quickly... Did you add your widget actor into the renderer ?
>>>> Did you reset the camera to be sure it is looking in the right direction ?
>>>>
>>>> Seb
>>>>
>>>> On Tue, Jan 17, 2012 at 1:10 PM, Marco Sambin <m.sambin at gmail.com> wrote:
>>>>> Hi all.
>>>>> I am trying to use a vtkDistanceWidget in my vtkCanvas-derived class.
>>>>>
>>>>> In the constructor of my vtkCanvas-derived class, I have the following code:
>>>>>
>>>>> [...]
>>>>>    // Initialize the measurements widget
>>>>>    vtkDistanceWidget distWidget = new vtkDistanceWidget();
>>>>>    distWidget.SetInteractor(iren);
>>>>>    vtkPointHandleRepresentation2D handle = new
>>>>> vtkPointHandleRepresentation2D();
>>>>>    handle.GetProperty().SetColor(1, 0, 0);
>>>>>    vtkDistanceRepresentation2D rep = new vtkDistanceRepresentation2D();
>>>>>    rep.SetHandleRepresentation(handle);
>>>>>    rep.GetAxis().SetNumberOfMinorTicks(4);
>>>>>    rep.GetAxis().SetTickLength(9);
>>>>>    rep.GetAxis().SetTitlePosition(0.2);
>>>>>    distWidget.SetRepresentation(rep);
>>>>>    distWidget.On();
>>>>> [...]
>>>>>
>>>>> For now, my vtkCanvas is empty, and there is no other relevant code in
>>>>> the constructor.
>>>>>
>>>>> I cannot get the vtkDistanceWidget to work. Nothing appears on screen
>>>>> when I left-press on my vtkCanvas.
>>>>>
>>>>> Am I missing something fundamental in order to have the
>>>>> vtkDistanceWidget to work?
>>>>>
>>>>> Thanks in advance for any hint.
>>>>>
>>>>> Best regards,
>>>>>
>>>>> Marco
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