Expressions in QGIS are more and more widely used for all kinds of purposes. For example the recently introduced geometry generators allow drawing awesome effects with modified feature geometries on the fly. The last days at the QGIS developer meeting 2017, I spent some time looking into and improving the Read more
Lately I’ve been spending time porting a bigger plugin from QGIS 2.8 to 3 while maintaining 2.8 compatibility. You can find it at https://github.com/opengisch/qgis2compat/ and https://plugins.qgis.org/plugins/qgis2compat/ One code to rule them all. My target was to have to edit the source code as little as possible to simulate a lazy Read more
Just for the sake of documenting things, when running qgis 2to3 on a plugin I encountered a tricky situation regarding signals. MYQGISDIR/scripts/2to3 -f signals -w my/plugin/path The original code: extra_arg = « my test argument » QObject.connect( action, SIGNAL( « triggered() »), lambda extra_arg=my_arg: show_extra_arg(extra_arg)) def do_load_project(extra_arg): print extra_arg # « my test argument » The Read more
Here an example on how to work with threads in a consistent and clean manner in QGIS python plugins
Behind the scenes a lot has happened to get ready for Qt5 and Python3. On the same codebase that is becoming the next release QGIS 2.16. This is really a great thing since we can focus work on a single master branch and I’m very happy that we got so Read more
Processing just got a new testing framework to improve the long-term stability of this important plugin. And you can help to improve it, even if you are not a software developer! This is yet another piece in our never-stopping crusade to improve the stability and quality of the best desktop GIS on Read more
Whenever you start QGIS you basically do it because? Right, because you need to do GIS work. Ah, how I love rhetorical questions to start a post. And most of the time one continues to work on a QGIS project which he has prepared before. For me 99% of the time, I Read more
PyQGIS now supports a nice new addition for handling edit sessions in layers. This way, changes get committed automatically at the end of a successful (python) edit session.
with edit(layer):
do your changes here()