[GRASS-user] exporting areas to shapefiles without filling holes

[Hamish]

Markus wrote:
> So.... please consider following patch:
> 
> 
> svn diff vector/v.out.ogr
> Index: vector/v.out.ogr/main.c
> ===================================================================
> --- vector/v.out.ogr/main.c 
>    (revision 36267)
> +++ vector/v.out.ogr/main.c 
>    (working copy)
> @@ -214,6 +214,9 @@
>      Vect_set_open_level(2);
>      Vect_open_old(&In,
> in_opt->answer, mapset);
> 
> +    if (Vect_get_num_islands(&In) > 0
> && !cat_flag->answer)
> +       G_warning(_("The map
> contains islands. To preserve them in the
> output map, use the -c flag"));
> +
>      /* fetch PROJ info */
>  
>    G_get_default_window(&cellhd);
>      if (cellhd.proj == PROJECTION_XY)
> 
> 
> v.out.ogr italy_country dsn=italy.shp type=area
> WARNING: The map contains islands. To preserve them, use
> the -c flag
> Exporting 26 areas (may take some time)...
>  100%
> 31 features written
> WARNING: 5 features without category were written
> 
> Makes sense?

perhaps use G_message() so that the user can turn if off if
the message is annoying in a loop? the default does the
unexpected, so some form of message is useful there.

and I support to reverse the flag in grass7 (and no message)
iff this doesn't have side effects for other OGR formats that
we haven't considered while only thinking about shapefiles.


Hamish