Re: [Inkscape-devel] Inkscape for embroidery

Hi Alexander, We've not moved to github yet, so if you need to do a merge request, you'll either have to make a bzr branch or get the help of another developer (hopefully on the mailing list) to do the merge for you. Best Regards, Martin Owens On Tue, 2016-11-22 at 01:30 +0100, Alexander Brock wrote: > On 11/21/2016 05:53 PM, Jabier Arraiza wrote: > > > > Is cool you improve it! Im working in a offset LPE currently and > > hope > > can use this new code soon. > > I improved it further the new code is in the *_stable-functions > here: > https://github.com/abrock/lib2geom/blob/master/src/toys/geom-pathst > ro > ke.cpp > > The old method for offset_cubic: > 1. move the control points > 2. checked if the error at t=.5 was below some threshold > 2. a) if yes return > 2. b) otherwise subdivide path and repeat (up to some recursion > depth > limit). > > The new method: > 1. move the control points > 2. Find the point on the curve where the distance differs the most > from > the desired distance > 3. Adjust control point (only lengthes, preserve direction and > smoothness) to minimize this maximum error > 4. checked if the error at t=.5 was below some threshold > 4. a) if yes return > 4. b) otherwise subdivide path and repeat (up to some recursion > depth > limit). > > This method seems to prevent degradation where the number of nodes > increases exponentially due to numerical instability. Attached are > examples of the old and new method used to repeatedly offset an > initial > red curve. The old code produces 4625 segments in the last step, > the > new > code 3. > > Should I prepare a merge request? > I'd like to run some tests, any suggestions which kind? I think the > most > important thing is to test for a wide variety of paths if the > created > offset path has constant distance from the original path. > > Best Regards, > Alexander > ------------------------------------------------------------------- > ----------- > _______________________________________________ > Inkscape-devel mailing list > Inkscape-devel(a)lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/inkscape-devel ------------------------------------------------------------------- ----------- _______________________________________________ Inkscape-devel mailing list Inkscape-devel(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/inkscape-devel