[Qgis-user] How to use QGIS plus-ins (QNEAT3, QChainage) in the Python custom applications?

[Werner Macho]

Hi!

Maybe I'll find some time to convert qchainage into a processing provider
plugin - but unfortunately not in the next 2 month.

regards
Werner

On Tue, Mar 28, 2023 at 11:08 AM LI, Xin Stephen [MIT] via QGIS-User <
qgis-user at lists.osgeo.org> wrote:

> Dear Germán,
>
>
>
> Thanks for your detailed reply. It is helpful.
>
>
>
> The Processing was used well in the python file following your
> instruction, especially by setting the sys path as
>
> sys.path.append('C:/OSGeo4W/apps/qgis/python/plugins')
>
>
>
> It is to try to use user-defined algorithms for the processing to realise
> the function similar to QChainage, i.e., divide a path into a series of
> nodes within it.
>
>
>
> Best regards,
>
> Stephen
>
>
>
>
>
>
>
> *From:* Germán Carrillo <carrillo.german at gmail.com>
> *Sent:* 2023年3月17日 9:45 PM
> *To:* LI, Xin Stephen [MIT] <stephenli at eduhk.hk>
> *Cc:* qgis-user at lists.osgeo.org
> *Subject:* Re: [Qgis-user] How to use QGIS plus-ins (QNEAT3, QChainage)
> in the Python custom applications?
>
>
>
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>
> Hi Stephen,
>
>
>
>
>
> if I understand your intention well, yes, I think it's possible, since
> I've used QGIS plugins in a custom PyQGIS application back in the days
> (namely, 2009!).
>
>
>
> I created a post to show off the results and to indicate the procedure
> (it's in Spanish). You can find it at [1].
>
>
>
> Perhaps you intend to use those plugins in a non-GUI application, which
> should also be possible.
>
>
>
> Accessing the underlying plugin's API, if provided, would require an
> analysis per plugin, which is feasible.
>
>
>
> For instance, QNEAT3 is a "Processing provider" plugin, which is handy for
> multiple reasons. For instance, you can use it via custom PyQGIS standalone
> scripts (see "Using QGIS Processing algorithms from PyQGIS standalone
> scripts (outside of GUI)" at [2]) or the "qgis_process" utility [3].
>
>
>
> On the contrary, QChainage doesn't seem to be a "Processing provider"
> plugin, so further exploration would be required.
>
>
>
> I hope that helps you get started.
>
>
>
>
>
> Regards,
>
>
>
> Germán
>
> ---------------------
>
> [1]
> https://geotux.tuxfamily.org/2009/08/31/cargando-plugins-de-qgis-en-el-visor-de-pyqgis/
> <https://protect2.fireeye.com/v1/url?k=31323334-501cfaeb-3130cb80-454455535732-267de21dafc248d6&q=1&e=7d337f9d-5681-4729-9548-b59bcd0a7842&u=https%3A%2F%2Fgeotux.tuxfamily.org%2F2009%2F08%2F31%2Fcargando-plugins-de-qgis-en-el-visor-de-pyqgis%2F>
>
> [2]
> https://gis.stackexchange.com/questions/279874/using-qgis-processing-algorithms-from-pyqgis-standalone-scripts-outside-of-gui
>
> [3]
> https://docs.qgis.org/3.28/en/docs/user_manual/processing/standalone.html?highlight=qgis_process#using-processing-from-the-command-line
>
>
>
> El vie, 17 mar 2023 a las 4:28, LI, Xin Stephen [MIT] via QGIS-User (<
> qgis-user at lists.osgeo.org>) escribió:
>
> Hello all QGIS users,
>
>
>
> Is there some approaches to import the QGIS plus-ins (QNEAT3, QChainage)
> as a library or package in the Python custom applications where PyQGIS
> imported?
>
>
>
> The functions of QNEAT3 to find shortest paths are expended to be used.
> Then, the shortest paths are expected to be marked/divided by points with
> the same distances.
>
>
>
> Do you have some experience about this or any other approaches/packages
> could achieve similar functions?
>
>
>
> Stephen
>
>
>
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