[Paraview-developers] String/Array List domain regular expression

[Biddiscombe, John A.]

Question :

The string array name regex stuff seems to work very nicely. Will check in later today I hope. But here's a problem

I'd like the user to be able to specify a string (in some config dialog created by the plugin) and have the ArrayListDomain, or StringListDomain, pick up the regex from the user.

If I create a custom panel for a particular filter, I reckon I can get the ArrayListDomain from the filter proxy property.

Is there another way that doesn't involve extra work?

thanks

JB



> -----Original Message-----
> From: paraview-developers-bounces at paraview.org [mailto:paraview-developers-
> bounces at paraview.org] On Behalf Of Biddiscombe, John A.
> Sent: 06 April 2010 15:35
> To: paraview-developers at paraview.org
> Subject: [Paraview-developers] String/Array List domain regular expression
> 
> I get a lot of data where scalars are defined by names like Density,
> density, rho, RHO, m_c_rho, rho_ - or any other possibly name that vaguely
> describes the data.
> 
> 
> 
> I've added a couple of new fields to the string array XML - an example is
> best
> 
>          name="Yarray"
> 
>          command="SetYarray"
> 
>          default_values="Coords_1"
> 
>          default_regex_delimiter=","
> 
>          default_regex=".*Y,.*y,.*oords_1"
> 
>          number_of_elements="1">
> 
> 
> 
> Now the regex is used to search all possible scalar arrays to find the first
> match. Not very complex, but my first tests show that for reasonably simple
> regexs (and data arrays), all seems good and I'm now able to save several
> array selection clicks by getting the default found for me.
> 
> 
> 
> In order to make this work, I added to vtkSMStringVectorProperty
> 
>   // Description:
> 
>   // If this string vector has regular expression searches attached
> 
>   // then provide a hook so that the a string list domain can pass in a list
> 
>   // of possible strings from which a default can be selected
> 
>   bool GetDefaultUsesRegex();
> 
> 
> 
>   // Description:
> 
>   // Using the regular expression list, pick one of the possible string
> 
>   // to be used as the default value
> 
>   const char* GetDefaultValue(vtkStringList *list);
> 
> 
> 
> and some tweaks to vtkSMStringListDomain so that the calls are made
> appropriately.
> 
> unfortunately, in order to pick a default, the vtkSMStringListDomain has to
> copy all of its internal array values into a vtkStringList, pass them to the
> VectorProperty, let it choose one and then destroy the list afterwards. This
> is because we are not allowed to use vtkstd::anything in headers and the
> list is already stored internally as a vtkstd::vector< ... >
> 
> 
> 
> I don't like it.
> 
> 
> 
> however, when I'm sure I've not broken anything I'll check the stuff in. I'd
> be grateful if one of the ServerManager Proxy whizzes from Kitware would
> take a glance at the code when it goes in to see if there's a tidier
> (/better) way of doing it. I'm never quite sure of the
> ArrayListDomain/StringListDomain/StringVectorProperty/etc etc as to who is
> supposed to own what.
> 
> 
> 
> Thanks
> 
> 
> 
> JB
> 
> 
> 
> 
> 
> --
> 
> John Biddiscombe,                            email:biddisco @ cscs.ch
> 
> http://www.cscs.ch/ <http://www.cscs.ch/>
> 
> CSCS, Swiss National Supercomputing Centre  | Tel:  +41 (91) 610.82.07
> 
> Via Cantonale, 6928 Manno, Switzerland      | Fax:  +41 (91) 610.82.82
> 
>