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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.Grass7Utils import Grass7Utils
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 = Grass7Utils.exportCrsWktToFile(layer.crs(), context)
newLocation = 'newProj{}'.format(alg.uniqueSuffix)
alg.commands.append('g.proj wkt="{}" location={}'.format(
wkt_file_name, newLocation))
# Go to the newly created location
alg.commands.append('g.mapset mapset=PERMANENT location={}'.format(
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 = Grass7Utils.exportCrsWktToFile(crs, context)
alg.commands.append('g.proj -c wkt="{}"'.format(wkt_file_name))
# Remove crs parameter
alg.removeParameter('crs')
# Add the location parameter with proper value
location = QgsProcessingParameterString(
'location',
'new location',
'newProj{}'.format(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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