On Sun, Jul 25, 2010 at 7:22 PM, Jaakko Salli <[email protected]> wrote: > > Hi Andrea, > > On 25.7.2010 19:58, iomeneandrei wrote: >> >> only for confirmation: is it impossible to rotate a layer with shapely? >> > > AFAIK 2D matrix transformations (rotate, scale, > etc.) are missing in the underlying GEOS library > that the Shapely uses. Personally I have needed the > transformations and have been doing them manually - > that is, applying the rotate and scale formulas on > the individual points of a polygon and then re- > constructing the polygon. This is not a quick operation > in pure Python and I assume that it should be much > faster when using GEOS with C/C++ (where you may have > direct access to polygon point). > > Regards, > Jaakko
Another issue is that Shapely has no concept of "layer". It supports operations on single geometric objects or collections of objects, but not on thematic layers. -- Sean _______________________________________________ Community mailing list [email protected] http://lists.gispython.org/mailman/listinfo/community
