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

[DelazJ]

Le ven. 4 mars 2022 à 05:13, Nicolas Cadieux via Qgis-user <
qgis-user at lists.osgeo.org> a écrit :

> 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.
>

No, You don't need to reselect: Given an existing line, take the vertex
tool, move close to an end point, click on the '+' and you can extend it
with as many segments as you wish (
https://docs.qgis.org/3.22/en/docs/user_manual/working_with_vector/editing_geometry_attributes.html#basic-operations
- adding vertices).
The issue here, and I confirm Andreas' first message, is that the vertex
tool ignores the tracing option, you need t click every new vertices.
Another issue I saw is that I spent a lot of time to find the tracing
button: it's available on the snapping toolbar, but not on the snapping
Options widget which opens (and I didn't enable the toolbar). I still have
issues to understand why we need two interfaces for these options, with
tools that are in one place and not in the other.

Regards,
Harrissou


>  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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