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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