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.ger...@gmail.com>
Sent: 2023年3月17日 9:45 PM
To: LI, Xin Stephen [MIT] <stephe...@eduhk.hk>
Cc: qgis-user@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@lists.osgeo.org<mailto:qgis-user@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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