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Merge pull request #8444 from NaturalGIS/reenable_grass_r_mapcalculator

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add GRASS r.mapcalculator, remove r.mapcalc
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Luigi Pirelli 2019-01-07 13:38:49 +01:00 committed by GitHub
commit 83c6a2c49b
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3 changed files with 11 additions and 74 deletions
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11
python/plugins/processing/algs/grass7/description/r.mapcalc.simple.txt Normal file
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r.mapcalc.simple
Calculate new raster map from a r.mapcalc expression.
Raster (r.*)
QgsProcessingParameterRasterLayer|a|Raster layer A|False
QgsProcessingParameterRasterLayer|b|Raster layer B|True
QgsProcessingParameterRasterLayer|c|Raster layer C|True
QgsProcessingParameterRasterLayer|d|Raster layer D|True
QgsProcessingParameterRasterLayer|e|Raster layer E|True
QgsProcessingParameterRasterLayer|f|Raster layer F|True
QgsProcessingParameterString|expression|Formula|A*2
QgsProcessingParameterRasterDestination|output|Calculated

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python/plugins/processing/algs/grass7/description/r.mapcalc.txt
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r.mapcalc
Raster map calculator.
Raster (r.*)
QgsProcessingParameterMultipleLayers|maps|Raster maps used in the calculator|3|None|True
QgsProcessingParameterString|expression|Expression to evaluate. Syntax e.g. `raster_out=raster1+raster2`. Use original filenames, without extension|None|True|True
QgsProcessingParameterFile|file|File containing expression(s) to evaluate (same rule for raster names than above)|QgsProcessingParameterFile.File|txt|None|True
QgsProcessingParameterString|seed|Integer seed for rand() function|None|False|True
*QgsProcessingParameterBoolean|-s|Generate random seed (result is non-deterministic)|False
QgsProcessingParameterFolderDestination|output_dir|Results Directory

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python/plugins/processing/algs/grass7/ext/r_mapcalc.py
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# -*- coding: utf-8 -*-
"""
***************************************************************************
r_mapcalc.py
------------
Date : February 2016
Copyright : (C) 2016 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__ = 'February 2016'
__copyright__ = '(C) 2016, Médéric Ribreux'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'
import os
def checkParameterValuesBeforeExecuting(alg, parameters, context):
""" Verify if we have the right parameters """
if (alg.parameterAsString(parameters, 'expression', context)
and alg.parameterAsString(parameters, 'file', context)):
return False, alg.tr("You need to set either inline expression or a rules file!")
return True, None
def processInputs(alg, parameters, context, feedback):
# We will use the same raster names than in QGIS to name the rasters in GRASS
rasters = alg.parameterAsLayerList(parameters, 'maps', context)
for idx, raster in enumerate(rasters):
rasterName = os.path.splitext(
os.path.basename(raster.source()))[0]
alg.inputLayers.append(raster)
alg.setSessionProjectionFromLayer(raster)
command = 'r.in.gdal input="{0}" output="{1}" --overwrite -o'.format(
os.path.normpath(raster.source()),
rasterName)
alg.commands.append(command)
alg.removeParameter('maps')
alg.postInputs()
def processCommand(alg, parameters, context, feedback):
alg.processCommand(parameters, context, feedback, True)
def processOutputs(alg, parameters, context, feedback):
# We need to export every raster from the GRASSDB
alg.exportRasterLayersIntoDirectory('output_dir',
parameters, context,
wholeDB=True)