[Qgis-user] Extending an existing line with the vertex tool - combination with tracing possible?

[Basques, Bob (CI-StPaul)]

Andreas,

You’re not along with this type of problem.  I’ve run into the same thing with some of the ArcTools for (Auto)Cad, where when editing an imported feature, the attributes from the DB get destroyed.  Supposedly fixed in recent releases, but our admins haven’t caught up with  the new releases yet.

Bobb



From: Qgis-user <qgis-user-bounces at lists.osgeo.org> on behalf of qgis-user <qgis-user at lists.osgeo.org>
Reply-To: Andreas Neumann <a.neumann at carto.net>
Date: Friday, March 4, 2022 at 2:38 AM
To: Simon Dietmann <simon.dietmann at pgnu.de>
Cc: qgis-user <qgis-user at lists.osgeo.org>
Subject: Re: [Qgis-user] Extending an existing line with the vertex tool - combination with tracing possible?

Think Before You Click: This email originated outside our organization.


Hi Simon and Nicolas,

Yes, that was our idea, too - to merge two or more lines that share their start/end vertices.

But unfortunately, this doesn't work for us, because we edit in a very complex data model and QGIS doesn't preserve feature Ids when merging features --> all of our DB relations would then fail.

See https://github.com/qgis/QGIS/issues/47629

I asked our commercial support provider to hopefully fix this issue ... then we could go the "merge route".

Andreas

On 2022-03-04 09:29, Simon Dietmann via Qgis-user wrote:

Hi Andreas,



as a workaround for your problem I would suppose you draw a new line feature using the tracing function and then merge it with the one you want to extend.

That should work without any problem.


Simon Dietmann
M.Sc. Physische Geografie



Von: Qgis-user <qgis-user-bounces at lists.osgeo.org> Im Auftrag von Nicolas Cadieux via Qgis-user
Gesendet: Freitag, 4. März 2022 05:13
An: Andreas Neumann <a.neumann at carto.net>
Cc: QGIS User List <qgis-user at lists.osgeo.org>
Betreff: Re: [Qgis-user] Extending an existing line with the vertex tool - combination with tracing possible?



Hi,



To my knowledge, when using the vertex tool, you click on the last node and then, you can extend it once.  I think you need to reclick the last node again if you want to add a new point.  I don't do much vectorizing lately and in the past, used AutoCAD to do it. There must be some other way of doing it. Maybe there is a shortcut or something like the shift key we need to use.  I would check the user manual to see if there is an option under the vertex tool.  I see that lots of new tools have been added lately making QGIS a good contender for tracing.  I guess you could just create a new line and then merge both together.



Just my grain of salt...

Nicolas Cadieux

https://gitlab.com/njacadieux



Le 1 mars 2022 à 05:24, Andreas Neumann <a.neumann at carto.net<mailto:a.neumann at carto.net>> a écrit :



Hi,

When I am extending an existing line with the vertex tool (by enabling the vertex tool and clicking on the small "plus" symbol), can I then still activate the "tracing" functionality to follow along other features?

If yes, I haven't found out how - any hints would be appreciated a lot!

Thanks,

Andreas

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