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77 lines
2.8 KiB
Python
77 lines
2.8 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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r_proj.py
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---------
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Date : October 2017
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Copyright : (C) 2017 by Médéric Ribreux
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Email : medspx at medspx dot fr
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = 'Médéric Ribreux'
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__date__ = 'October 2017'
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__copyright__ = '(C) 2017, Médéric Ribreux'
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from qgis.core import QgsProcessingParameterString
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from ..Grass7Utils import isWindows
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def processInputs(alg, parameters, context, feedback):
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# Grab the projection from the input vector layer
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layer = alg.parameterAsLayer(parameters, 'input', context)
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layerCrs = layer.crs().toProj()
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# Creates a new location with this Crs
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newLocation = 'newProj{}'.format(alg.uniqueSuffix)
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alg.commands.append('g.proj proj4="{}" location={}'.format(
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layerCrs, newLocation))
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# Go to the newly created location
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alg.commands.append('g.mapset mapset=PERMANENT location={}'.format(
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newLocation))
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# Import the layer
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alg.loadRasterLayerFromParameter(
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'input', parameters, context, False)
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# Go back to default location
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alg.commands.append('g.mapset mapset=PERMANENT location=temp_location')
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# Grab the projected Crs
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crs = alg.parameterAsCrs(parameters, 'crs', context)
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alg.commands.append('g.proj -c proj4="{}"'.format(
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crs.toProj(), newLocation))
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# Remove crs parameter
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alg.removeParameter('crs')
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# Add the location parameter with proper value
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location = QgsProcessingParameterString(
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'location',
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'new location',
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'newProj{}'.format(alg.uniqueSuffix)
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)
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alg.addParameter(location)
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# And set the region
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grassName = alg.exportedLayers['input']
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# We use the shell to capture the results from r.proj -g
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if isWindows():
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# TODO: make some tests under a non POSIX shell
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alg.commands.append('set regVar=')
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alg.commands.append('for /f "delims=" %%a in (\'r.proj -g input="{}" location="{}"\') do @set theValue=%%a'.format(
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grassName, newLocation))
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alg.commands.append('g.region -a %regVar%')
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else:
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alg.commands.append('g.region -a $(r.proj -g input="{}" location="{}")'.format(
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grassName, newLocation))
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