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617 lines
27 KiB
Python
617 lines
27 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Grass7Algorithm.py
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---------------------
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Date : February 2015
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Copyright : (C) 2014-2015 by Victor Olaya
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Email : volayaf at gmail dot com
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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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from builtins import str
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from builtins import range
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__author__ = 'Victor Olaya'
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__date__ = 'February 2015'
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__copyright__ = '(C) 2012-2015, Victor Olaya'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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import os
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import uuid
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import importlib
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from qgis.PyQt.QtCore import QCoreApplication, QUrl
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from qgis.core import (QgsRasterLayer,
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QgsApplication,
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QgsProcessingUtils,
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QgsMessageLog,
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QgsProcessingAlgorithm,
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QgsProcessingParameterDefinition,
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QgsProcessingException,
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QgsProcessingParameterExtent,
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QgsProcessingParameterNumber)
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from qgis.utils import iface
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#from processing.core.GeoAlgorithm import GeoAlgorithm (replaced by QgsProcessingAlgorithm)
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from processing.core.ProcessingConfig import ProcessingConfig
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#from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException (replaced by QgsProcessingException).
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from processing.core.parameters import (getParameterFromString,
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ParameterVector,
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ParameterMultipleInput,
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#ParameterExtent,
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#ParameterNumber,
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#ParameterSelection,
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ParameterRaster,
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ParameterTable,
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ParameterBoolean,
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ParameterString,
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ParameterPoint)
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from processing.core.outputs import (getOutputFromString,
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OutputRaster,
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OutputVector,
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OutputFile,
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OutputHTML)
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from .Grass7Utils import Grass7Utils
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from processing.tools import dataobjects, system
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pluginPath = os.path.normpath(os.path.join(
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os.path.split(os.path.dirname(__file__))[0], os.pardir))
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class Grass7Algorithm(QgsProcessingAlgorithm):
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GRASS_OUTPUT_TYPE_PARAMETER = 'GRASS_OUTPUT_TYPE_PARAMETER'
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GRASS_MIN_AREA_PARAMETER = 'GRASS_MIN_AREA_PARAMETER'
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GRASS_SNAP_TOLERANCE_PARAMETER = 'GRASS_SNAP_TOLERANCE_PARAMETER'
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GRASS_REGION_EXTENT_PARAMETER = 'GRASS_REGION_PARAMETER'
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GRASS_REGION_CELLSIZE_PARAMETER = 'GRASS_REGION_CELLSIZE_PARAMETER'
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GRASS_REGION_ALIGN_TO_RESOLUTION = '-a_r.region'
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OUTPUT_TYPES = ['auto', 'point', 'line', 'area']
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def __init__(self, descriptionfile):
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super().__init__()
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#GeoAlgorithm.__init__(self)
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self._name = ''
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self._display_name = ''
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self._group = ''
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self.grass7Name = ''
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self.hardcodedStrings = []
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self.descriptionFile = descriptionfile
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self.defineCharacteristicsFromFile()
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self.numExportedLayers = 0
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self.uniqueSuffix = str(uuid.uuid4()).replace('-', '')
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# Use the ext mechanism
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name = self.name().replace('.', '_')
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try:
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self.module = importlib.import_module('processing.algs.grass7.ext.' + name)
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except ImportError:
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self.module = None
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def name(self):
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return self._name
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def displayName(self):
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return self._display_name
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def group(self):
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return self._group
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def icon(self):
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return QgsApplication.getThemeIcon("/providerGrass.svg")
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def svgIconPath(self):
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return QgsApplication.iconPath("providerGrass.svg")
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def tr(self, string, context=''):
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if context == '':
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context = self.__class__.__name__
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return QCoreApplication.translate(context, string)
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def helpUrl(self):
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helpPath = Grass7Utils.grassHelpPath()
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if helpPath == '':
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return None
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if os.path.exists(helpPath):
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return QUrl.fromLocalFile(os.path.join(helpPath, '{}.html'.format(self.grass7Name))).toString()
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else:
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return helpPath + '{}.html'.format(self.grass7Name)
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def getParameterDescriptions(self):
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descs = {}
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_, helpfile = self.help()
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try:
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with open(helpfile) as infile:
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lines = infile.readlines()
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for i in range(len(lines)):
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if lines[i].startswith('<DT><b>'):
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for param in self.parameterDefinitions():
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searchLine = '<b>' + param.name() + '</b>'
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if searchLine in lines[i]:
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i += 1
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descs[param.name()] = (lines[i])[4:-6]
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break
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except Exception:
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pass
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return descs
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def defineCharacteristicsFromFile(self):
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"""
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Create algorithm parameters and outputs from a text file.
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"""
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with open(self.descriptionFile) as lines:
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# First line of the file is the Grass algorithm name
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line = lines.readline().strip('\n').strip()
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self.grass7Name = line
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# Second line if the algorithm name in Processing
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line = lines.readline().strip('\n').strip()
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self._name = line
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self._display_name = QCoreApplication.translate("GrassAlgorithm", line)
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if " - " not in self._name:
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self._name = self.grass7Name + " - " + self._name
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self._display_name = self.grass7Name + " - " + self._display_name
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self._name = self._name[:self._name.find(' ')].lower()
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# Read the grass group
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line = lines.readline().strip('\n').strip()
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self._group = QCoreApplication.translate("GrassAlgorithm", line)
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hasRasterOutput = False
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hasVectorInput = False
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vectorOutputs = 0
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# Then you have parameters/output definition
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line = lines.readline().strip('\n').strip()
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while line != '':
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try:
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line = line.strip('\n').strip()
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if line.startswith('Hardcoded'):
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self.hardcodedStrings.append(line[len('Hardcoded|'):])
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parameter = getParameterFromString(line)
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if parameter is not None:
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self.addParameter(parameter)
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if isinstance(parameter, ParameterVector):
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hasVectorInput = True
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if isinstance(parameter, ParameterMultipleInput) \
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and parameter.datatype < 3:
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hasVectorInput = True
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else:
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output = getOutputFromString(line)
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self.addOutput(output)
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if isinstance(output, OutputRaster):
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hasRasterOutput = True
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elif isinstance(output, OutputVector):
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vectorOutputs += 1
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if isinstance(output, OutputHTML):
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self.addOutput(OutputFile("rawoutput",
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self.tr("{0} (raw output)").format(output.description()),
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"txt"))
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line = lines.readline().strip('\n').strip()
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except Exception as e:
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QgsMessageLog.logMessage(self.tr('Could not open GRASS GIS 7 algorithm: {0}\n{1}').format(self.descriptionFile, line), self.tr('Processing'), QgsMessageLog.CRITICAL)
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raise e
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self.addParameter(QgsProcessingParameterExtent(
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self.GRASS_REGION_EXTENT_PARAMETER,
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self.tr('GRASS GIS 7 region extent'))
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)
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if hasRasterOutput:
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self.addParameter(QgsProcessingParameterNumber(
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self.GRASS_REGION_CELLSIZE_PARAMETER,
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self.tr('GRASS GIS 7 region cellsize (leave 0 for default)'),
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type=QgsProcessingParameterNumber.Double,
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minValue=0.0, maxValue=None, defaultValue=0.0)
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)
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if hasVectorInput:
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param = QgsProcessingParameterNumber(self.GRASS_SNAP_TOLERANCE_PARAMETER,
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self.tr('v.in.ogr snap tolerance (-1 = no snap)'),
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type=QgsProcessingParameterNumber.Double,
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minValue=-1.0, maxValue=None, defaultValue=-1.0)
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param.setFlags(param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
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self.addParameter(param)
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param = QgsProcessingParameterNumber(self.GRASS_MIN_AREA_PARAMETER,
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self.tr('v.in.ogr min area'),
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type=QgsProcessingParameterNumber.double,
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minValue=0.0, maxValue=None, defaultValue=0.0001)
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param.setFlags(param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
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self.addParameter(param)
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if vectorOutputs == 1:
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param = QgsProcessingParameterEnum(self.GRASS_OUTPUT_TYPE_PARAMETER,
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self.tr('v.out.ogr output type'),
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self.OUTPUT_TYPES)
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param.setFlags(param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
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self.addParameter(param)
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def getDefaultCellsize(self, parameters, context):
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cellsize = 0
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for param in self.parameterDefinitions():
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if param.name() in parameters:
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value = parameters[param.name()]
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if isinstance(param, ParameterRaster):
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if isinstance(value, QgsRasterLayer):
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layer = value
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else:
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layer = QgsProcessingUtils.mapLayerFromString(param.value, context)
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cellsize = max(cellsize, (layer.extent().xMaximum() -
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layer.extent().xMinimum()) /
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layer.width())
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elif isinstance(param, ParameterMultipleInput):
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layers = value.split(';')
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for layername in layers:
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layer = QgsProcessingUtils.mapLayerFromString(layername, context)
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if isinstance(layer, QgsRasterLayer):
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cellsize = max(cellsize, (
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layer.extent().xMaximum() -
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layer.extent().xMinimum()) /
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layer.width()
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)
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if cellsize == 0:
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cellsize = 100
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return cellsize
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def processAlgorithm(self, parameters, context, feedback):
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if system.isWindows():
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path = Grass7Utils.grassPath()
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if path == '':
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raise QgsProcessingException(
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self.tr('GRASS GIS 7 folder is not configured. Please '
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'configure it before running GRASS GIS 7 algorithms.'))
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# Create brand new commands lists
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self.commands = []
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self.outputCommands = []
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self.exportedLayers = {}
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# If GRASS session has been created outside of this algorithm then
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# get the list of layers loaded in GRASS otherwise start a new
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# session
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existingSession = Grass7Utils.sessionRunning
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if existingSession:
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self.exportedLayers = Grass7Utils.getSessionLayers()
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else:
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Grass7Utils.startGrass7Session()
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# Handle ext functions for inputs/command/outputs
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if self.module:
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if hasattr(self.module, 'processInputs'):
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func = getattr(self.module, 'processInputs')
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func(self)
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else:
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self.processInputs(parameters, context)
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if hasattr(self.module, 'processCommand'):
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func = getattr(self.module, 'processCommand')
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func(self)
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else:
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self.processCommand()
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if hasattr(self.module, 'processOutputs'):
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func = getattr(self.module, 'processOutputs')
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func(self)
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else:
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self.processOutputs()
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else:
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self.processInputs(parameters, context)
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self.processCommand()
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self.processOutputs()
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# Run GRASS
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loglines = []
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loglines.append(self.tr('GRASS GIS 7 execution commands'))
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for line in self.commands:
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feedback.pushCommandInfo(line)
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loglines.append(line)
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if ProcessingConfig.getSetting(Grass7Utils.GRASS_LOG_COMMANDS):
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QgsMessageLog.logMessage("\n".join(loglines), self.tr('Processing'), QgsMessageLog.INFO)
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Grass7Utils.executeGrass7(self.commands, feedback, self.outputCommands)
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for out in self.outputs:
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if isinstance(out, OutputHTML):
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with open(self.getOutputFromName("rawoutput").value) as f:
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rawOutput = "".join(f.readlines())
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with open(out.value, "w") as f:
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f.write("<pre>%s</pre>" % rawOutput)
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# If the session has been created outside of this algorithm, add
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# the new GRASS GIS 7 layers to it otherwise finish the session
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if existingSession:
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Grass7Utils.addSessionLayers(self.exportedLayers)
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else:
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Grass7Utils.endGrass7Session()
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def processInputs(self, parameters, context):
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"""Prepare the GRASS import commands"""
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for param in self.parameterDefinitions():
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if isinstance(param, ParameterRaster):
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if not param.name() in parameters():
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continue
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value = parameters[param.name()]
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# Check if the layer hasn't already been exported in, for
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# example, previous GRASS calls in this session
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if value in list(self.exportedLayers.keys()):
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continue
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else:
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self.setSessionProjectionFromLayer(value, self.commands)
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self.commands.append(self.exportRasterLayer(value))
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if isinstance(param, ParameterVector):
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if not param.name() in parameters():
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continue
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value = parameters[param.name()]
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if value in list(self.exportedLayers.keys()):
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continue
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else:
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self.setSessionProjectionFromLayer(value, self.commands)
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self.commands.append(self.exportVectorLayer(value))
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if isinstance(param, ParameterTable):
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pass
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if isinstance(param, ParameterMultipleInput):
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if not param.name() in parameters():
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continue
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value = parameters[param.name()]
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layers = value.split(';')
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if layers is None or len(layers) == 0:
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continue
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if param.datatype == dataobjects.TYPE_RASTER:
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for layer in layers:
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if layer in list(self.exportedLayers.keys()):
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continue
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else:
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self.setSessionProjectionFromLayer(layer, self.commands)
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self.commands.append(self.exportRasterLayer(layer))
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elif param.datatype in [dataobjects.TYPE_VECTOR_ANY,
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dataobjects.TYPE_VECTOR_LINE,
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dataobjects.TYPE_VECTOR_POLYGON,
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dataobjects.TYPE_VECTOR_POINT]:
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for layer in layers:
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if layer in list(self.exportedLayers.keys()):
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continue
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else:
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self.setSessionProjectionFromLayer(layer, self.commands)
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self.commands.append(self.exportVectorLayer(layer))
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self.setSessionProjectionFromProject(self.commands)
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region = \
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str(self.getParameterValue(self.GRASS_REGION_EXTENT_PARAMETER))
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if not region:
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region = QgsProcessingUtils.combineLayerExtents(layers)
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regionCoords = region.split(',')
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command = 'g.region'
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command += ' n=' + str(regionCoords[3])
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command += ' s=' + str(regionCoords[2])
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command += ' e=' + str(regionCoords[1])
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command += ' w=' + str(regionCoords[0])
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cellsize = self.getParameterValue(self.GRASS_REGION_CELLSIZE_PARAMETER)
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if cellsize:
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command += ' res=' + str(cellsize)
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else:
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command += ' res=' + str(self.getDefaultCellsize(parameters, context))
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alignToResolution = \
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self.getParameterValue(self.GRASS_REGION_ALIGN_TO_RESOLUTION)
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if alignToResolution:
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command += ' -a'
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self.commands.append(command)
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def processCommand(self, parameters):
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"""Prepare the GRASS algorithm command
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:param parameters:
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"""
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command = self.grass7Name
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command += ' ' + ' '.join(self.hardcodedStrings)
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# Add algorithm command
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for param in self.parameterDefinitions():
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if param.value is None or param.value == '':
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continue
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if param.name in [self.GRASS_REGION_CELLSIZE_PARAMETER, self.GRASS_REGION_EXTENT_PARAMETER, self.GRASS_MIN_AREA_PARAMETER, self.GRASS_SNAP_TOLERANCE_PARAMETER, self.GRASS_OUTPUT_TYPE_PARAMETER, self.GRASS_REGION_ALIGN_TO_RESOLUTION]:
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continue
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if isinstance(param, (ParameterRaster, ParameterVector)):
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value = param.value
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if value in list(self.exportedLayers.keys()):
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command += ' ' + param.name() + '=' \
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+ self.exportedLayers[value]
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else:
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command += ' ' + param.name() + '=' + value
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elif isinstance(param, ParameterMultipleInput):
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s = param.value
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for layer in list(self.exportedLayers.keys()):
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s = s.replace(layer, self.exportedLayers[layer])
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s = s.replace(';', ',')
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command += ' ' + param.name() + '=' + s
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elif isinstance(param, ParameterBoolean):
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if param.value:
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command += ' ' + param.name()
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elif isinstance(param, QgsProcessingParameterEnum):
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idx = int(param.value)
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command += ' ' + param.name() + '=' + str(param.options[idx][1])
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elif isinstance(param, ParameterString):
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command += ' ' + param.name() + '="' + str(param.value) + '"'
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elif isinstance(param, ParameterPoint):
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command += ' ' + param.name() + '=' + str(param.value)
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else:
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command += ' ' + param.name() + '="' + str(param.value) + '"'
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for out in self.outputs:
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if isinstance(out, OutputFile):
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command += ' > ' + out.value
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elif not isinstance(out, OutputHTML):
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# We add an output name to make sure it is unique if the session
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# uses this algorithm several times.
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uniqueOutputName = out.name + self.uniqueSuffix
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command += ' ' + out.name + '=' + uniqueOutputName
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# Add output file to exported layers, to indicate that
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# they are present in GRASS
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self.exportedLayers[out.value] = uniqueOutputName
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command += ' --overwrite'
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self.commands.append(command)
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def processOutputs(self):
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"""Prepare the GRASS v.out.ogr commands"""
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for out in self.outputs:
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if isinstance(out, OutputRaster):
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filename = out.value
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# Raster layer output: adjust region to layer before
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# exporting
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self.commands.append('g.region raster=' + out.name + self.uniqueSuffix)
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self.outputCommands.append('g.region raster=' + out.name +
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self.uniqueSuffix)
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if self.grass7Name == 'r.statistics':
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# r.statistics saves its results in a non-qgis compatible
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# way. Post-process them with r.mapcalc.
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calcExpression = 'correctedoutput' + self.uniqueSuffix
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calcExpression += '=@' + out.name + self.uniqueSuffix
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command = 'r.mapcalc expression="' + calcExpression + '"'
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self.commands.append(command)
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self.outputCommands.append(command)
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command = 'r.out.gdal --overwrite -c createopt="TFW=YES,COMPRESS=LZW"'
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command += ' input='
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command += 'correctedoutput' + self.uniqueSuffix
|
|
command += ' output="' + filename + '"'
|
|
else:
|
|
command = 'r.out.gdal --overwrite -c createopt="TFW=YES,COMPRESS=LZW"'
|
|
command += ' input='
|
|
|
|
if self.grass7Name == 'r.horizon':
|
|
command += out.name + self.uniqueSuffix + '_0'
|
|
elif self.grass7Name == 'r.statistics':
|
|
self.commands.append(command)
|
|
self.outputCommands.append(command)
|
|
else:
|
|
command += out.name + self.uniqueSuffix
|
|
command += ' output="' + filename + '"'
|
|
self.commands.append(command)
|
|
self.outputCommands.append(command)
|
|
|
|
if isinstance(out, OutputVector):
|
|
filename = out.value
|
|
typeidx = self.getParameterValue(self.GRASS_OUTPUT_TYPE_PARAMETER)
|
|
outtype = ('auto' if typeidx
|
|
is None else self.OUTPUT_TYPES[typeidx])
|
|
if self.grass7Name == 'r.flow':
|
|
command = 'v.out.ogr type=line layer=0 -s -e input=' + out.name + self.uniqueSuffix
|
|
elif self.grass7Name == 'v.voronoi':
|
|
if '-l' in self.commands[-1]:
|
|
command = 'v.out.ogr type=line layer=0 -s -e input=' + out.name + self.uniqueSuffix
|
|
else:
|
|
command = 'v.out.ogr -s -e input=' + out.name + self.uniqueSuffix
|
|
command += ' type=' + outtype
|
|
elif self.grass7Name == 'v.sample':
|
|
command = 'v.out.ogr type=point -s -e input=' + out.name + self.uniqueSuffix
|
|
else:
|
|
command = 'v.out.ogr -s -e input=' + out.name + self.uniqueSuffix
|
|
command += ' type=' + outtype
|
|
command += ' output="' + os.path.dirname(out.value) + '"'
|
|
command += ' format=ESRI_Shapefile'
|
|
command += ' output_layer=' + os.path.basename(out.value)[:-4]
|
|
command += ' --overwrite'
|
|
self.commands.append(command)
|
|
self.outputCommands.append(command)
|
|
|
|
def exportVectorLayer(self, orgFilename):
|
|
context = dataobjects.createContext()
|
|
|
|
# TODO: improve this. We are now exporting if it is not a shapefile,
|
|
# but the functionality of v.in.ogr could be used for this.
|
|
# We also export if there is a selection
|
|
if not os.path.exists(orgFilename) or not orgFilename.endswith('shp'):
|
|
layer = QgsProcessingUtils.mapLayerFromString(orgFilename, context, False)
|
|
if layer:
|
|
filename = dataobjects.exportVectorLayer(layer)
|
|
else:
|
|
layer = QgsProcessingUtils.mapLayerFromString(orgFilename, context, False)
|
|
if layer:
|
|
#TODO
|
|
#useSelection = \
|
|
# ProcessingConfig.getSetting(ProcessingConfig.USE_SELECTED)
|
|
if useSelection and layer.selectedFeatureCount() != 0:
|
|
filename = dataobjects.exportVectorLayer(layer)
|
|
else:
|
|
filename = orgFilename
|
|
else:
|
|
filename = orgFilename
|
|
destFilename = 'a' + os.path.basename(self.getTempFilename())
|
|
self.exportedLayers[orgFilename] = destFilename
|
|
command = 'v.in.ogr'
|
|
min_area = self.getParameterValue(self.GRASS_MIN_AREA_PARAMETER)
|
|
command += ' min_area=' + str(min_area)
|
|
snap = self.getParameterValue(self.GRASS_SNAP_TOLERANCE_PARAMETER)
|
|
command += ' snap=' + str(snap)
|
|
command += ' input="' + os.path.dirname(filename) + '"'
|
|
command += ' layer=' + os.path.basename(filename)[:-4]
|
|
command += ' output=' + destFilename
|
|
command += ' --overwrite -o'
|
|
return command
|
|
|
|
def setSessionProjectionFromProject(self, commands):
|
|
if not Grass7Utils.projectionSet and iface:
|
|
proj4 = iface.mapCanvas().mapSettings().destinationCrs().toProj4()
|
|
command = 'g.proj'
|
|
command += ' -c'
|
|
command += ' proj4="' + proj4 + '"'
|
|
self.commands.append(command)
|
|
Grass7Utils.projectionSet = True
|
|
|
|
def setSessionProjectionFromLayer(self, layer, commands):
|
|
context = dataobjects.createContext()
|
|
if not Grass7Utils.projectionSet:
|
|
qGisLayer = QgsProcessingUtils.mapLayerFromString(layer, context)
|
|
if qGisLayer:
|
|
proj4 = str(qGisLayer.crs().toProj4())
|
|
command = 'g.proj'
|
|
command += ' -c'
|
|
command += ' proj4="' + proj4 + '"'
|
|
self.commands.append(command)
|
|
Grass7Utils.projectionSet = True
|
|
|
|
def exportRasterLayer(self, layer):
|
|
destFilename = 'a' + os.path.basename(self.getTempFilename())
|
|
self.exportedLayers[layer] = destFilename
|
|
command = 'r.external'
|
|
command += ' input="' + layer + '"'
|
|
command += ' band=1'
|
|
command += ' output=' + destFilename
|
|
command += ' --overwrite -o'
|
|
return command
|
|
|
|
def getTempFilename(self):
|
|
# TODO Replace with QgsProcessingUtils generateTempFilename
|
|
return system.getTempFilename()
|
|
|
|
def canExecute(self):
|
|
message = Grass7Utils.checkGrass7IsInstalled()
|
|
return not message, message
|
|
|
|
def checkParameterValues(self, parameters, context):
|
|
if self.module:
|
|
if hasattr(self.module, 'checkParameterValuesBeforeExecuting'):
|
|
func = getattr(self.module, 'checkParameterValuesBeforeExecuting')
|
|
return func(self), None
|
|
return super(Grass7Algorithm, self).checkParameterValues(parameters, context)
|