[Qgis-user] GRASS map calculator bug/feature

[Radim Blazek]

Hi,
nice to see that the tool is used. I found that you can  type
anything as constant (Add constant value) but that is just another
bug because there should be QDoubleValidator set on that input
so I cannot reccomend to use this because that may not work in future
(including saved formulas).

I would like to avoid the possibility to type anything in map input control
because it is not robust enough - user can type wrong map name and
r.mapcalc fails. GRASS Tools should not let a user to run a module
with parameters which can fail.

IMO we can add onother control beside map combo box for cell selection
(default 0,0). If you are interested in this feature, please fill a new ticket
(enhancement, 0.9).

BTW, do you realy need to work with individual cells or do you need
just a sum/avg/... from cells in neighbourhood?

Radim


On 12/26/06, Lubos Balazovic <lubos.balazovic at gmail.com> wrote:
> Hi,
> in QGIS Preview2 (WINDOWS) there was a bug [1] in GRASS map calculator which
> preserves user to choose layer from list so user had to type name of the
> layer manually. Recently I've find out that this is nice feature which
> allows to type for example "layername[10,10]" which is interpreted by
> mapcalc as reference for neighbourhood of each processed cell in raster. Now
> the bug is fixed and nice feature is over. The question is: Is there
> currently another way in GRASS raster map calculator which allows to use
> referencies for cells neighbourhood? Is it possible to change static list of
> GRASS raster layers to be writeable?
>
> Lubos
>
> [1] http://svn.qgis.org/trac/ticket/318
>
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.qgis.org
> http://lists.qgis.org/cgi-bin/mailman/listinfo/qgis-user
>
>
>