Asger Skovbo Petersen AsgerPetersen

Debugging QGIS python plugins using VSCode on OSX

This is how I debug QGIS using VSCode on OSX. Previously I used this approach. But since then ptvsd was deprecated and I also needed to install python modules backed by native C code. This is much easier to do in a conda based environment (actually, I didn't find a way to make it work with the official QGIS installer :-)).

Get QGIS running in a conda env

Follow this description to get QGIS running in conda.

Install debugpy

ptvsd is superseded by debugpy.

Acti

QGIS on OSX with Conda

Install Anaconda or Miniconda from here https://docs.conda.io/projects/conda/en/latest/user-guide/install/macos.html

Create a conda environment in which you will install QGIS. In this example we call it conda_qgis.

> conda create -n conda_qgis
> conda activate conda_qgis

Install modified rasterstats from https://github.com/AsgerPetersen/python-rasterstats/tree/boundless to use this script as is.

Or just modify the bool in this line https://github.com/perrygeo/python-rasterstats/blob/master/src/rasterstats/io.py#L319

Script output:

❯ time python test.py
Using boundless: True
python test.py 72.11s user 9.82s system 99% cpu 1:21.96 total

Debugging QGIS 3.x python plugins on OSX using VS Code

Plugin

In QGIS install the plugin debugvs.

Python dependencies

The debugvs plugin needs the python module ptvsd to function. This module is not installed by default.

In principle you just pip install ptvsd in the python interpreter used by QGIS.

Based heavily on this old guide by TimLinux http://linfiniti.com/2012/09/remote-debugging-qgis-plugins-using-pycharm/

In PyCharm click menu "Run -> Edit Configurations" (Or click Edit Configurations in the dropdown in the toolbar)
Click the plus to add a new "Python Remote Debug" config
Name the config. Use port 53100 (Could probably be any high port)
Add to the python code:

import sys
sys.path.append('/Applications/PyCharm.app/Contents/debug-eggs/pycharm-debug.egg')

Wedge buffers in python

Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

	-- plpython needs to be enabled. Furthermore scipy needs to be installed in the python used.
	-- CREATE LANGUAGE plpythonu;

	CREATE OR REPLACE FUNCTION septima.voronoi(geom geometry, boundingpointdistance double precision)
	RETURNS SETOF geometry_dump AS
	$BODY$
	from scipy.spatial import Voronoi
	import numpy

	class GeoVoronoi:

	from math import log, ceil, sqrt

	# Gennemsnitlig stoerrelse af en tile. 25kB passer nogenlunde med ortofoto
	size_per_tile = 25 * 1024 # 25kB



	# --------GSTs standard skema ---------------
	# Koordinater paa tilet omraade (xmin, ymin, xmax, ymax)
	#bbox = [120000, 5900000, 1000000, 6500000]

	#%%cython -I/usr/local/include -L/usr/local/lib -llas_c
	# Created by Casey Goodlett
	cimport cython
	import numpy as np
	cimport numpy as np
	import liblas

	DTYPE = np.float64
	ctypedef np.float64_t DTYPE_t