[Paraview] Forcing update on view

[Utkarsh Ayachit]

I am not sure I follow what you're doing, but here are a few things to note.

1. vtkSMProxy::UpdateVTKObjects() is called to push changes done to a
property. Thus, only needs to be called on the proxy whose properties
you're changing. Thus, if you are chaning "CompositeDataSetIIndex"
property on the chartRepresentationProxy, you only need to call
UpdateVTKObjects() on it.
2. pqView::forceRender() cancels pending renders, so you don't have to
do that explicitly.
3. When CompositeDataSetIndex property is changed and successfully
pushed, vtkChartRepresentation::AddCompositeDataSetIndex() should be
called. Try putting a breakpoint there to ensure it's getting called
when you're expecting it to happen.

Hope that helps,
Utkarsh

On Tue, Jun 14, 2016 at 5:35 AM, Andrzej Peczak <apeczak at ara.co.uk> wrote:
> I missed the question regarding the problem I describe. Is there a way to programmatically display the content of CompositeDataSetIndex property depending on status of the checkbox widgets I change through vector properties?
>
> Andrzej
>
> Hi,
>
> I have a snippet code which I wrote to allow me to save multiple plot images to files. I do it by changing property checkboxes of Composite Data Set Index property. I can change their status programmatically but the view is not being updated. When I change them manually in the UI the view knows about their status change and plots only the content I select. I tried to force the update with UpdateVTkObjects() of available properties plus explicitly calling render()/forceRender() of the view but with no success.  Every file I create has multiple plot curves in it instead of one.
>
> Andrzej
>
>         pqDataRepresentation *repr = source->getRepresentation( view );
>         auto chartRepresentationProxy = repr->getProxy();
>
>         vtkSMProperty *property = chartRepresentationProxy->GetProperty( "CompositeDataSetIndex" );
>         if ( property ) {
>
>                 auto VectorProperty = vtkSMIntVectorProperty::SafeDownCast( property );
>                 if ( VectorProperty ) {
>
>                         const auto numElements = VectorProperty->GetNumberOfElements();
>                         int elements[ numElements ];
>                         std::copy( VectorProperty->GetElements(), VectorProperty->GetElements() + numElements, elements );
>                         for ( auto i = 0 ; i != numElements ; ++i ) {
>                                 VectorProperty->SetElement( elements[ i ], 0 );
>                         }
>
>                         for ( auto i = 0 ; i != numElements ; ++i ) {
>                                 VectorProperty->SetElement( elements[ i ], 1 );
>
>                                 source->getSourceProxy()->UpdateVTKObjects();
>                                 view->getViewProxy()->UpdateVTKObjects();
>                                 view->getViewProxy()->Update();
>                                 repr = source->getRepresentation( view );
>                                 repr->getProxy()->UpdateVTKObjects();
>                                 repr->renderView( true );
>                                 property->GetParent()->UpdateVTKObjects();
>                                 view->cancelPendingRenders();
>                                 view->forceRender();
>
>                                 std::stringstream ssFileName;
>                                 std::string ext , newName2;
>                                 std::string::size_type dot_pos = newName.rfind( '.' );
>                                 if ( dot_pos != std::string::npos ) {
>                                         ext = newName.substr( dot_pos );
>                                         newName2 = newName.substr( 0, dot_pos );
>                                 }
>                                 ssFileName << newName2 << "_" << i + 1 << ext;
>                                 view->writeImage( ssFileName.str().c_str(), size, quality );
>                                 VectorProperty->SetElement( elements[ i ], 0 );
>                         }
>
>                         VectorProperty->SetElements( elements );
>                 }
>         }
>
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