[Qgis-developer] Shapely Python package

[Carson Farmer]

Hi Guillaume,
> i built some python plugins before but i have only few knowledge about how does it work.
> I would like to know if i could use the Shapely Python package within QGis?
>
> http://pypi.python.org/pypi/Shapely
> http://gispython.org/shapely/manual.html
>   
Yes certainly. In fact, I think there are already some python plugins 
that use this library.
> I would like to write a plugin with more selection features than now (contains, equals, intersects...).
> The "selection by location" tool in fTools seems to be great but i can't use it because of a bug...
>
> https://trac.osgeo.org/qgis/ticket/1669
>   
Yes, I am aware of this bug, and it will be fixed during the developers 
meeting next week. Apologies for not having gotten to this sooner :-( I 
am also planning on implementing additional overlay constraints (as you 
have mentioned above), and another developer has provided a patch to add 
additional selection constraints.

If you would like to contribute additional selection tools, I would 
encourage you to use the QGIS API to do so, as this means a) fewer 
dependencies for users, and b) more direct access to the layers on the 
map canvas (for selecting features etc). Having said that, if you are 
willing to do some coding, perhaps you would like to contribute to the 
current implementation (fTools) to help improve it rather than creating 
a new one?

Regards,

Carson

-- 
Carson J. Q. Farmer
ISSP Doctoral Fellow
National Centre for Geocomputation (NCG),
National University of Ireland, Maynooth,
Email: Carson.Farmer at gmail.com
Web:   http://www.carsonfarmer.com/
       http://www.ftools.ca/