Hi Silvain,
Hm - this will require a "Python action".
Because with a generic action you could do something like:
length(make_line($geometry,make_point(@click_x,@click_y)))
using a QGIS expression, but there are two problems:
- you can only get @click_x and @click_y if you click on the feature;
but since it is a point feature you cannot click outside the tolerance
of this point in order to receive the coordinates
- generic actions do not allow updates of data
So you'd have to use a Python action. If you Google for QGIS Python
actions, you should get some ideas how it works.
Andreas
On 2022-06-23 15:32, PIERRE Sylvain wrote:
Hi Andreas,
I want an interactive solution . Close to measurement tool except I can
catch the length and update a field in the layer table.
De : Andreas Neumann <a.neum...@carto.net>
Envoyé : jeudi 23 juin 2022 15:29
À : PIERRE Sylvain <sylvain.pie...@alsace.eu>
Cc : qgis-developer@lists.osgeo.org
Objet : Re: [QGIS-Developer] action get measure
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Hi Sylvain,
Do you want an interactive solution where the user should interactively
draw a second point - or is the second point already in your data
table?
Andreas
On 2022-06-23 14:42, PIERRE Sylvain via QGIS-Developer wrote:
Hi ,
I want to build an action on a point layer, wich draw a line from a
point and store the lenght inside a field layer.
Is ther any way to do that ?
Thanks
Sylvain
Sylvain PIERRE
Chef de projet système d'information
Direction des Systèmes d'Information et du Développement Numérique
Service Projets et Ingénierie Numérique
Collectivité européenne d'Alsace
Tél : 03 88 76 68 88
sylvain.pie...@alsace.eu
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