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 <[email protected]> on behalf of qgis-user 
<[email protected]>
Reply-To: Andreas Neumann <[email protected]>
Date: Friday, March 4, 2022 at 2:38 AM
To: Simon Dietmann <[email protected]>
Cc: qgis-user <[email protected]>
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 <[email protected]> Im Auftrag von Nicolas 
Cadieux via Qgis-user
Gesendet: Freitag, 4. März 2022 05:13
An: Andreas Neumann <[email protected]>
Cc: QGIS User List <[email protected]>
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 
<[email protected]<mailto:[email protected]>> 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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