Better handling of curved shapes - general ticket

[haubourg]

Many improvements and bugfixes are raised concerning curves digitizing and snapping.

• [ ] Reshape tool: Reshaping one curve part will segmentize all parts of the geometry, when it should only segmentize one.

• [ ] Current tools almost always segmentizes the input curved parts. Merge tool, cut tool, cut & paste do that. .

• [x] Add ability to create full circle. > this is adressed by https://github.com/qgis/QGIS/pull/4947

• [ ] Add the ability to extend an existing geometry with a curve

-- FR version

• Outils "reshape tool" / édition de polyligne ou polygone - si l'objet contient un ou plusieurs arcs de cercle, lors de l'édition, les arcs de cercles doivent être conservé et non dénormalisés les arcs en petits segments de lignes
• Outils fusionner / couper , copier et déplacer une géométrie : - conserver les arcs de cercle existants dans les géométries.
• Pouvoir prolonger / éditer une géométrie existante avec un arc de cercle (par ex.: prolongement d'une ligne avec un arc de cercle.
• Outils de création d'arc de cercle et cercle complet . (création de cercle, selon rayon, ou selon des points d'accroche) - = plugin CADigitize

[haubourg]

@qwat-psc : Loic Bartoletti is needing some hep to push its work https://github.com/qgis/QGIS/pull/4947 . Any objection for asking Paul to spend half a day on reviewing his code to help it land in QGIS 3 and see if Loic can be helpful in this area?

[dsavary]

@haubourg No objection, good news !

[ponceta]

:+1:

[ponceta]

@dsavary @haubourg DXF export for arc, circles and ellipses could be mentioned here too right?

[haubourg]

After some discussions with Loïc, he has a lot of needs for refactoring edit tools and CAD needs. He just published a first QGEP here: https://github.com/qgis/QGIS-Enhancement-Proposals/issues/106 @dsavary @ponceta I think it's worth you participate in the discussion there. Another one is coming specifically for snapping and curves / 3D enhancement. I'll try to help in merging your needs

[haubourg]

Reviewing Loic work, he spotted two critical issues with SRS handling and cicular string SRS handling: https://issues.qgis.org/issues/17269 https://issues.qgis.org/issues/17270

They will need to be adressed.@ponceta @savary, did you hit those issues already? Can we spend time on fixing them ?

[dsavary]

@haubourg No . I did not notice this before. No . I think this is not a priority for us. We only use one projection in our QGIS project. More important bugs about drawing tools

[haubourg]

Ok thanks Daniel!

[ponceta]

I was not aware of that but it seems like a frontier between GIS and CAD is closing in, since a circle won't be a circle anymore after some reprojections.