Hi, After research, it seems QGIS can draw parametric line with Bezier3D and parametricLine classes : http://www.qgis.it/api/classBezier3D.html In your plugin CADTOOL do you use these objects ? Other question for developer, do you think this bezier3d curve need a transformation into linearstring for correct rendering ?
Best regards, SR. On Sun, Jul 17, 2011 at 4:26 PM, Ziegler Stefan <[email protected]>wrote: > ** > Hi > > I think that curved line support is not that important to most of the > users. I really would like to see this feature in QGIS. But this is > something that needs some funding and as far as I know some changes deep in > the core. Something for QGIS 2.x I guess. > > regards > Stefan > > -----Ursprüngliche Nachricht----- > *Von:* reyman [mailto:[email protected]] > *Gesendet am:* Sonntag, 17. Juli 2011 01:30 > *An:* [email protected] > *Betreff:* [Qgis-developer] Re: Curved line in QGIS, how i can anticipate > CIRCULARSTRING SQL-MM3 specification in QGIS? > > Hello community, > No answer or idea to help me on this problem ? > Best regards, > SR > > On Wed, Jul 13, 2011 at 5:00 PM, reyman <[email protected]> wrote: > >> Hello devs, >> >> I'm working on a project to draw simple arc/curves lines to represent (a >> lot of ) flow between two points. >> I think it's a good idea to use the new geometry type "CIRCULARSTRING" >> implemented in Postgis to store/edit the arc/curve, one problem ... >> QGIS can't actually draw curved lines... >> >> Actually here my few and poor idea to resolve this problem : >> >> > I use Stefan Ziegler QGIS plugin CADTOOLS to compute and draw any WKT >> using the CIRCULARSTRING geometry type, with few point to limit the >> complexity of polylines generated >> >> > I'm waiting for the next QGIS dev version, because it seems developper >> want to implement this function ( cf QGIS Developer Meeting in Zurich >> 2011 <http://www.qgis.org/wiki/6._QGIS_Developer_Meeting_in_Zurich_2011>or >> http://www.qgis.org/wiki/KCube-developer ) >> >> > I'm trying to develop (in python or it's only possible in C++ ?) a new >> drawing extension which implement one function to draw pure bezier or simple >> arc with CIRCULARSTRING geometry in input ? >> >> So QGIS dev, what's your opinion about that, or your next plan if you have >> a roadmap to implement these functionnality ? >> If you want to develop this functionnality in this summer, i'm ok to help >> and debug the code with you ... >> >> Ps: i have post a question in gis stackexchange, but no answer actually >> ... >> >> http://gis.stackexchange.com/questions/12007/how-i-can-draw-or-edit-curved-lines-in-free-gis >> >> *Thanks a lot GIS community* >> SR. >> >> -- >> <http://stackoverflow.com/users/385881/reyman64> >> >> > > > -- > <http://stackoverflow.com/users/385881/reyman64> > > -- <http://stackoverflow.com/users/385881/reyman64>
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