[QGIS-Developer] action get measure

[Andreas Neumann]

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, at 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.neumann at carto.net>
> Envoyé : jeudi 23 juin 2022 15:29
> À : PIERRE Sylvain <sylvain.pierre at alsace.eu>
> Cc : qgis-developer at 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
>> 
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