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"""
***************************************************************************
r_proj.py
---------
Date : October 2017
Copyright : (C) 2017 by Médéric Ribreux
Email : medspx at medspx dot fr
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************
"""
__author__ = "Médéric Ribreux"
__date__ = "October 2017"
__copyright__ = "(C) 2017, Médéric Ribreux"
from qgis.core import QgsProcessingParameterString
from processing.tools.system import isWindows
from grassprovider.grass_utils import GrassUtils
def processInputs(alg, parameters, context, feedback):
# Grab the projection from the input vector layer
layer = alg.parameterAsLayer(parameters, "input", context)
# Creates a new location with this Crs
wkt_file_name = GrassUtils.exportCrsWktToFile(layer.crs(), context)
newLocation = f"newProj{alg.uniqueSuffix}"
alg.commands.append(f'g.proj wkt="{wkt_file_name}" location={newLocation}')
# Go to the newly created location
alg.commands.append(f"g.mapset mapset=PERMANENT location={newLocation}")
# Import the layer
alg.loadRasterLayerFromParameter("input", parameters, context, False)
# Go back to default location
alg.commands.append("g.mapset mapset=PERMANENT location=temp_location")
# Grab the projected Crs
crs = alg.parameterAsCrs(parameters, "crs", context)
wkt_file_name = GrassUtils.exportCrsWktToFile(crs, context)
alg.commands.append(f'g.proj -c wkt="{wkt_file_name}"')
# Remove crs parameter
alg.removeParameter("crs")
# Add the location parameter with proper value
location = QgsProcessingParameterString(
"location", "new location", f"newProj{alg.uniqueSuffix}"
)
alg.addParameter(location)
# And set the region
grassName = alg.exportedLayers["input"]
# We use the shell to capture the results from r.proj -g
if isWindows():
# TODO: make some tests under a non POSIX shell
alg.commands.append("set regVar=")
alg.commands.append(
'for /f "delims=" %%a in (\'r.proj -g input^="{}" location^="{}"\') do @set regVar=%%a'.format(
grassName, newLocation
)
)
alg.commands.append("g.region -a %regVar%")
else:
alg.commands.append(
'g.region -a $(r.proj -g input="{}" location="{}")'.format(
grassName, newLocation
)
)
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