This particular implementation is C++ (see the .cpp extension on the file). But the C++ and Python API is almost identical, so you can use the C++ code as a reference for your PyQGIS code. [image: Logo] <https://spatialthoughts.com/> Ujaval Gandhi Spatial Thoughts mobile: +91-8095684687 email: uja...@spatialthoughts.com [image: LinkedIn icon] <https://www.linkedin.com/in/spatialthoughts/> [image: Twitter icon] <https://twitter.com/spatialthoughts>
On Wed, Jun 9, 2021 at 2:11 PM Prem Kumar <prem.net...@gmail.com> wrote: > Hi Ujaval, > > Thank you very much for pointing that out. That serves my purpose. > > In fact, I had initially searched for a python implementation of the > Offsetlines processing tool but did not get it. Just a quick question, how > do we trace whether the processing tool implementation is in python or c++? > > -Prem > > On Wed, Jun 9, 2021 at 1:53 PM Ujaval Gandhi <uja...@spatialthoughts.com> > wrote: > >> You can look at the implementation >> <https://github.com/qgis/QGIS/blob/2d1aa68f0d044f2aced7ebeca8d2fa6b754ac970/src/analysis/processing/qgsalgorithmoffsetlines.cpp> >> of offsetline algorithm and you'll notice that it >> uses geometry.offsetCurve(). You can do the same in your code. >> [image: Logo] <https://spatialthoughts.com/> >> Ujaval Gandhi >> Spatial Thoughts >> mobile: +91-8095684687 >> email: uja...@spatialthoughts.com >> [image: LinkedIn icon] <https://www.linkedin.com/in/spatialthoughts/> >> [image: >> Twitter icon] <https://twitter.com/spatialthoughts> >> >> >> >> On Wed, Jun 9, 2021 at 1:31 PM Prem Kumar <prem.net...@gmail.com> wrote: >> >>> Hi Team, >>> >>> Just wondering if there is a python api which gets an offset line or >>> parallel line (to both left and right sides) to a given line geometry in >>> Qgis Python. I know there exists a processing tool called Offsetlines >>> <https://docs.qgis.org/3.16/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#offset-lines> >>> but >>> need this similar functionality at geometry object level so that I can >>> create offset lines only when needed based on my logic. >>> >>> The only way now is that I can perform the Offset lines on the entire >>> layer and then access the offset geometry if needed. >>> >>> On other hand, shapely has parallel_offset >>> <https://shapely.readthedocs.io/en/stable/manual.html#object.parallel_offset> >>> but >>> this needs conversion from shapely geometry to qgisgeometry. >>> >>> Just looking for thoughts on this to optimize heavy geometry operations. >>> Appreciate your help. >>> >>> -Prem >>> _______________________________________________ >>> QGIS-Developer mailing list >>> QGIS-Developer@lists.osgeo.org >>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer >>> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer >>> >>
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