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

[Andreas Neumann]

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> 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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