[Qgis-developer] GEOS functions

Martin Dobias wonder.sk at gmail.com
Sat Jan 31 15:02:47 EST 2009

On Sat, Jan 31, 2009 at 6:28 PM, Carson Farmer <carson.farmer at gmail.com> wrote:
> Andreas Neumann wrote:
>> as far as I know this behavior was already with GEOS 2x. You have to deal
>> with it. In case you get a geometry collection you can extract the part you
>> are interested in. In case you are dealing with Polygons, extract the
>> polygon part and skip/ignore the line and point part of the Geometry
>> collection. Thats how I did it with some Postgis related work.
> Yes I think this is the only option at this point, but since most 'analysis'
> plugins will be using python, and pyQGIS doesn't have direct access to GEOS
> geometries, we have to have some way to do this based on QgsGeometry().
> Can anyone think of a more efficient/practical way of accessing the
> geometries stored in a geometry collection?

Yes, reworking the geometry class in QGIS :-)
Our group has started also with task, but it will take some time until
we'll have it ready...


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