[Paraview] Changing values of property panel

[Yumin Yuan]

Hi Andrzej,

On Thu, Jan 28, 2016 at 8:25 AM, Andrzej Peczak <apeczak at ara.co.uk> wrote:

> Hi Yumin,
>
> I used your snippet and it is working fine. I also tried to change the
> properties of the upstream filter in addition to the active one but it put
> me into trouble. I am modifying the properties with the following code
> where I want to change the visibility, surface representation and input
> array of the upstream. When I execute the code the widgets get changed but
> nothing happens in the view with regards to the changes I made to the
> upstream, that is the upstream object stays invisible. To make the object
> visible I have to manually click on the active object.
>

You may be missing a render call. Try adding the following at the end
 myView->render();


> After that the upstream object becomes visible but then its colour mapping
> does not change in accordance with  the input array I set to the upstream.
>

You have to also set the same "LookupTable" to the upstream representation.


> The other issue I have is when I delete my object from the pipeline after
> modifying the lookup table. Paraview displays "vtkSMPVRepresentationProxy
> (0x2f6c8c0): Failed to determine the LookupTable being used." message.
>
>
Which object? how did you delete it? Normally this message means you have
an empty "LookupTable".

HTH
Yumin

        vtkSMProxy* repProxy = repr->getProxy();
>         const char * arrayName = vtkSMPropertyHelper(repProxy,
> "ColorArrayName").GetInputArrayNameToProcess();
>         int association = vtkSMPropertyHelper(repProxy,
> "ColorArrayName").GetInputArrayAssociation();
>
>         pqDataRepresentation * uRepr =
> repr->getRepresentationForUpstreamSource();
>         vtkSMProxy* uRepProxy = uRepr->getProxy();
>         vtkSMPropertyHelper( uRepProxy, "ColorArrayName"
> ).SetInputArrayToProcess( association, arrayName );
>         vtkSMPropertyHelper( uRepProxy, "ColorArrayName" ).Set( arrayName
> );
>         vtkSMPropertyHelper( uRepProxy, "Visibility" ).Set( 1 );
>         vtkSMPropertyHelper( uRepProxy, "Representation" ).Set( "Surface"
> );
>
>         repProxy->UpdateVTKObjects();
>         uRepProxy->UpdateVTKObjects();
>
>
> Andrzej
>
> ------------------------------
> *From:* Yumin Yuan [yumin.yuan at kitware.com]
> *Sent:* 27 January 2016 14:41
> *To:* Andrzej Peczak
> *Cc:* paraview at paraview.org
> *Subject:* Re: [Paraview] Changing values of property panel
>
> Hi Andrzej,
>
> The representation has its own SM proxy,
>
>     vtkSMProxy* repProxy = repr->getProxy();
>     vtkSMPropertyHelper(repProxy, "Representation").Set("Surface With
> Edges");
>     vtkSMPropertyHelper(repProxy, "LineWidth").Set(2);
>
> HTH,
> Yumin
>
>
> On Wed, Jan 27, 2016 at 7:36 AM, Andrzej Peczak <apeczak at ara.co.uk> wrote:
>
>>
>> Hi
>>
>> I am trying to find a way to modify property values of a filter. I
>> figured out how to change values of the lookup table through its proxy
>> after which the changes are visible in the colour map editor panel widgets.
>>
>> I can do it with the following snippet code, however I have not found yet
>> the way to change properties of the filter property panel.  I need to
>> change the view representation of the filter to Surface With Edges and the
>> line width. Where  do I acquire required proxy objects from ?
>>
>>         pqPipelineRepresentation* repr = qobject_cast<
>> pqPipelineRepresentation* >(
>> pqActiveObjects::instance().activeRepresentation() );
>>         if ( repr ) {
>>                 vtkSMProxy * lutProxy =
>> repr->getLookupTable()->getProxy();
>>                 if ( lutProxy ) {
>>                         vtkSMPropertyHelper( lutProxy,
>> "NumberOfTableValues" ).Set( this->scalars().count() - 1 );
>>                         lutProxy->UpdateVTKObjects();
>>                 }
>>         }
>>
>> Andrzej
>>
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> Note: All email sent to or from this address may be accessed by someone
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> 503668 Registered Office:
> Manton Lane, Bedford MK41 7PF England VAT No GB 196351245
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