[QGIS-Developer] Interaction API?

[andrea antonello]

Hi Hannes,

> could you make the groovy part write a file or to a database that you have
> your students load as layer in QGIS and which will refresh from its source
> automatically on map canvas interaction? That might be a hacky but
> sufficient solution if I understand your goal correctly. If you write to a
> WKT file for example and load that in QGIS in watch mode, QGIS will
> automatically notice chances and refresh it without any interaction
> necessary (at least on Linux)!
>
that is actually something I have not thought of. Nice idea, I will
investigate it.



> Otherwise it is very well be possible to implement a "pipe" into QGIS /
> API for QGIS using various techniques (maybe even expose iface and some
> nasty "exec"ing :D ). E. g. check out
> https://github.com/gem/oq-irmt-qgis/tree/qgis3-socketserver which uses
> websockets.
>

That is actually very cool. But I have no QGIS plugin development skills,
so that won't probably be an option for me.

Thanks a lot,
Andrea



> Cheers, Hannes
>
>
> Am 10.09.21 um 14:38 schrieb andrea antonello:
>
> Hi Richard,
>
> > I guess you mean QGIS Desktop, right? AFAIK the only option is to use
>> its Python API, which requires all the PyQGIS <
>> https://docs.qgis.org/3.16/en/docs/pyqgis_developer_cookbook/index.html>
>> and binary libs to be available inside the environment.
>>
>> Just curious: but would it be possible to 'attach' your script to a
>> running/visible instance of QGIS?
>>
>> From:
>> https://docs.qgis.org/testing/en/docs/pyqgis_developer_cookbook/intro.html#python-applications
>>
>> So: I start QGIS, and then from some python console (NOT the internal
>> one), I can try to load (and show!) a shapefile in current mapcanvas? Or
>> pan/zoom? That would be cool for demonstrations...
>>
>
> I have to apologize and give a little context. I teach geographic
> scripting at a local university. Students come from the previous geomatics
> course with Arc.
> Since I have no intention to teach Arc scripting, I have been doing it for
> several years now happily using a scripting environment based on Geoscript
> Groovy [1].
> So we are talking about a completely different programming language.
> In the last year I have been able to pull some of them over to QGIS, but
> the traction is low. So I was hoping to be able to attach to some APi to
> load results into a running QGIS instance. That would be really cool,
> surely convince them and I would have been able to develop the geoscript
> part necessary to my environment.
>
> In the meanwhile I read Gio's comment: "Another option could be run a
> "micro server" inside a pyqgis plugin and serve an ad-hoc API from it :)"
>
> Yes, that would have been my dream :-)
>
> Thanks for your comments.
>
> Andrea
>
>
> [1] https://jericks.github.io/geoscript-groovy-cookbook
>
>
>>
>> Regards,
>>
>> Richard Duivenvoorde
>>
>>
>>
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