[Gvsig_english] gvSIG 1.11: add consecutive numbers to selection?

[Francisco Puga]

guou, it works like a charm. Thanks Antonio.

I didn't remember about the "global" operator of python to allow set a
counter for various rows. Very nice tip.

El día 28 de marzo de 2012 14:36, Antonio Falciano
<afalciano at yahoo.it> escribió:
> Hi all,
> field expression is based on the values of the same row, however field
> calculator commands are Jython's functions. So it's possible to memorize
> a variable during field calculations using the advanced tab, for
> instance loading and evaluating the following script consecutiveN.py:
>
> #consecutiveN.py
> from javax.swing import JOptionPane
>
> def consecutiveN():
>   global index
>   try:
>     if rec() == 0:
>       index = 0
>     else:
>       index = index + 1
>   except:
>       index = ''
>   return index
>
> # Usage: consecutiveN()
> JOptionPane.showMessageDialog(None, 'Usage: consecutiveN()',
> "consecutiveN", JOptionPane.INFORMATION_MESSAGE)
>
> Its usage is very simple. If the first record is not selected, the index
> will be 1-based and so consecutiveN() will do the trick, otherwise it
> will start from 0 and so consecutiveN()+1 would be necessary.
>
> Cheers,
> Antonio
>
> Il 27/03/2012 20.17, Francisco Puga ha scritto:
>> Seems like a simple request but after think a bit more, i don't find a
>> way to accomplish it. Field Expression is based on the values of the
>> row actual being processing, it hasn't have memory, so the program
>> doesn't know which is the next number to use.
>>
>> Sorry.
>>
>> El día 27 de marzo de 2012 19:07, spatialjoeescribió:
>>> Hi Francisco,
>>>
>>> thanks for your advice. With sextante numbering individual selections of a
>>> layer will result in new individual shapefiles which then can be merged back
>>> into one. Not sure if I like this but that's the way it'll work.
>>> Nonetheless pointing to sextante was useful anyway. I somehow got mentally
>>> stuck  with rec()+1.
>>> Thanks again!
>>>
>>> best,
>>>
>>> Johannes
>>>
>>> --
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>>
>>
>>
>
> --
> Antonio Falciano
> http://www.linkedin.com/in/antoniofalciano
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-- 
Francisco Puga
Grupo de Desarrollo
Cartolab - Laboratorio de Ingeniería Cartográfica.
http://www.cartolab.es

ETS Ingeniería de Caminos, Canales y Puertos
Universidade da Coruña
Campus de Elviña - 15071 A Coruña (España)
(34)981167000 ext. 5493