Hi Denis & Pierre On Thu, Oct 31, 2013 at 1:45 PM, Denis Rouzaud <[email protected]> wrote: > > I put the dev list in copy, since there should be someone arond who's more > aware on the topic. > I saw that Martin Dobias was the committer for the topology editing [0]. > Martin, do you have any suggstion on this?
Let me give some historical context first because I am afraid we are mixing two different things :-) For a long time QGIS has some support for "topology editing". But that's not a proper topology editing as one may think - from documentation: "The option Enable topological editing is for editing and maintaining common boundaries in polygon mosaics. QGIS ‘detects’ a shared boundary in a polygon mosaic and you only have to move the vertex once and QGIS will take care about updating the other boundary." Originally there were separate map tools for addition, removal and moving of points which were also doing updates to the shared boundaries of polygons if the "topological editing" was enabled. The old commit Denis is referring to was basically meant to add the same functionality also to the newly created node tool that was meant to replace the three separate tools. Now about "real" topology editing of data consisting of nodes and edges - as discussed already in issue #3483, there are various topology models (PostGIS topo, GRASS, OpenStreetMap, ...?) that would need slightly different set of tools and validation methods. I have not really investigated if it is possible to have a support to cover all of those models - or even it is worth it. Maybe for a start it would be enough to pick one and focus just on that (PostGIS topo being my personal favorite). In general I would love to see a new "topology" layer type in QGIS (next to vector and raster) that would bring native topology viewing and editing capabilities to QGIS. I am not aware of anyone working on that - if you can spend some time on that matter, I am sure you will make many people happy :-) Regards Martin _______________________________________________ Qgis-developer mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-developer
