[Paraview-developers] Updating view properties

[David Thompson]

Hi Utkarsh,

> There are multiple ways:
> * One way would be listen to the change event in the
> vtkSMContextViewProxy (or subclass) which should then call a method on
> your vtkPVContextView subclass on all processess using SendStream().
> Then in that method you can use BROADCAST to send the message.

I'm not sure exactly which "change event" you mean I should listen to.  
The EndEvent signalling the end of a render? The Modified event  
signaling a change in the vtkPVContextView subclass on the client? Or  
(certainly not) the StateChangedEvent used by Undo/Redo?

> * Another way is since EndEvent is only fired on client, you can use
> vtkPVSynchronizedWindows::TriggerRMI to trigger an RMI on all the
> other processes and then in the callback do the broadcast (look at
> vtkSpreadSheetView::FetchBlockCallback, it is does something similar,
> the FetchBlock method is called only on the client, but it ensures
> that all processes get invovled).

Thanks a lot! And sorry to keep pestering you with the same question  
over and over, but what can I say? I'm slow.

	David



> On Tue, Feb 8, 2011 at 12:59 PM, David Thompson <dcthomp at sandia.gov>  
> wrote:
>> Hi all,
>>
>> Any hints on how one might subclass a ParaView chart view/ 
>> representation so
>> that a pipeline property can get modified when the vtkAxis limits are
>> changed (say, by a user panning or zooming the plot)? I want a  
>> source which
>> to fetch just the things that might be drawn, plus perhaps some  
>> padding.
>>
>> At least one problem is that rendering happens on the client, and  
>> thus
>> vtkAxis changes aren't available on the servers where the pipeline  
>> resides.
>> Would overriding vtkPVContextView's Render method to force  
>> rendering on the
>> servers (even though it would not be used) work? ParaView doesn't  
>> seem to
>> like updating properties during a client render, or even afterwards  
>> in a
>> vtkCommand::EndEvent observer attached to the renderer; the server  
>> process
>> exits with non-zero status when it receives a BROADCAST message  
>> instead of
>> an RMI message.
>>
>>        Thanks,
>>        David
>>
>> _______________________________________________
>> Paraview-developers mailing list
>> Paraview-developers at paraview.org
>> http://public.kitware.com/mailman/listinfo/paraview-developers
>>
>