[Paraview] Custom panel widget

[Utkarsh Ayachit]

Andrzej,

Here's a possible approach:

Add a "information_only" property to the proxy to retrieve the values
for  max_distance computed by the filter. You can create a custom
SIProperty [1] subclass to support arbitrary API to get the values
from your filter and communicate that to the SMProperty. Your widget
that can explicitly monitor this property to update view of "current
values" as appropriate.

What I am not sure if whether the information_property will get
updates every time the filter re-executes, e.g. when time changes. If
it doesn't, we may have to explicitly monitor the
vtkCommand::UpdateDataEvent fired by the proxy and call
vtkSMProxy::UpdatePropertyInformation() explicitly.

[1] http://www.paraview.org/ParaView3/Doc/Nightly/www/cxx-doc/classvtkSIProperty.html

On Fri, May 27, 2016 at 11:58 AM, Andrzej Peczak <apeczak at ara.co.uk> wrote:
> Yes, this is what I want Utkarsh.
>
> The filter does not necessary has to output the distances on the output port (which I presumably would do by assigning a field array to the output geometry)  but I definitely would like them to display and modify in the panel widget to affect the execution logic of the filter.
>
> Andrzej
>
> -----Original Message-----
> From: Utkarsh Ayachit [mailto:utkarsh.ayachit at kitware.com]
> Sent: 27 May 2016 13:51
> To: Andrzej Peczak
> Cc: ParaView
> Subject: Re: [Paraview] Custom panel widget
>
> Andrzej,
>
> Just to make sure I understand:
>
> vtkCpCutter calculates slices aka contours on surface and also outputs an array of  "max-distance"s. You want the user to be able to see these values on the panel for this filter and then change them which in turn affects some execution logic in vtkCpCutter. Is that correct?
>
> Utkarsh
>
> On Thu, May 26, 2016 at 7:30 AM, Andrzej Peczak <apeczak at ara.co.uk> wrote:
>> Hi Utkarsh
>>
>> Our use-case scenario is that we have our own filter based on vtkCpCutter (both vtkPolyData on the input and output port) . We use this filter to generate a set of slices on surface geometry. We then process the obtained contours with vtkPlotEdges. For each contour (slice) we would like to compute a scalar value, say max distance between two points in the contour and output the values to the scalar list widget. Of course we also would like to modify the distances and send it back to the filters. These values will be used to update the output of the filter.
>>
>> Andrzej
>>
>>
>> -----Original Message-----
>> From: Utkarsh Ayachit [mailto:utkarsh.ayachit at kitware.com]
>> Sent: 23 May 2016 14:58
>> To: Andrzej Peczak
>> Cc: ParaView
>> Subject: Re: [Paraview] Custom panel widget
>>
>>> Is it possible to create a custom widget for a filter which would allow me to retrieve the results of its computation? I would like to reproduce the functionality of the pqDoubleVectorPropertyWidget and populate it with values computed by the filter. I know how to create and register the widget but I do not know how do I send values to it from the filter. In paraview code base  I found vtkEventQtSlotConnect but I do not know if it is of any use to my problem.
>>
>> There are several ways of skinning this cat. Can you elaborate of what exactly is your use-case? Do you want the default values for this double-vector-property (DVP) set using some values provided by the VTK filter, but allow user to override using UI?
>>
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