# -*- coding: utf-8 -*-
"""
***************************************************************************
Grass7Algorithm.py
---------------------
Date : February 2015
Copyright : (C) 2014-2015 by Victor Olaya
Email : volayaf at gmail dot com
***************************************************************************
* *
* 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__ = 'Victor Olaya'
__date__ = 'February 2015'
__copyright__ = '(C) 2012-2015, Victor Olaya'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'
import sys
import os
import uuid
import importlib
from qgis.PyQt.QtCore import QCoreApplication, QUrl
from qgis.core import (QgsRasterLayer,
QgsApplication,
QgsMapLayer,
QgsProcessingUtils,
QgsProcessing,
QgsMessageLog,
QgsVectorFileWriter,
QgsProcessingAlgorithm,
QgsProcessingParameterDefinition,
QgsProcessingException,
QgsProcessingParameterExtent,
QgsProcessingParameterEnum,
QgsProcessingParameterNumber,
QgsProcessingParameterString,
QgsProcessingParameterField,
QgsProcessingParameterPoint,
QgsProcessingParameterBoolean,
QgsProcessingParameterVectorLayer,
QgsProcessingParameterRasterLayer,
QgsProcessingParameterMultipleLayers,
QgsProcessingParameterVectorDestination,
QgsProcessingParameterRasterDestination,
QgsProcessingParameterFileDestination,
QgsProcessingParameterFolderDestination,
QgsProcessingOutputFolder,
QgsProcessingOutputVectorLayer,
QgsProcessingOutputRasterLayer,
QgsProcessingOutputHtml,
QgsProcessingUtils)
from qgis.utils import iface
from processing.core.ProcessingConfig import ProcessingConfig
from processing.core.parameters import (getParameterFromString)
from .Grass7Utils import Grass7Utils
#from processing.tools import dataobjects, system
from processing.tools.system import isWindows, getTempFilename
pluginPath = os.path.normpath(os.path.join(
os.path.split(os.path.dirname(__file__))[0], os.pardir))
class Grass7Algorithm(QgsProcessingAlgorithm):
GRASS_OUTPUT_TYPE_PARAMETER = 'GRASS_OUTPUT_TYPE_PARAMETER'
GRASS_MIN_AREA_PARAMETER = 'GRASS_MIN_AREA_PARAMETER'
GRASS_SNAP_TOLERANCE_PARAMETER = 'GRASS_SNAP_TOLERANCE_PARAMETER'
GRASS_REGION_EXTENT_PARAMETER = 'GRASS_REGION_PARAMETER'
GRASS_REGION_CELLSIZE_PARAMETER = 'GRASS_REGION_CELLSIZE_PARAMETER'
GRASS_REGION_ALIGN_TO_RESOLUTION = 'GRASS_REGION_ALIGN_TO_RESOLUTION'
GRASS_RASTER_FORMAT_OPT = 'GRASS_RASTER_FORMAT_OPT'
GRASS_RASTER_FORMAT_META = 'GRASS_RASTER_FORMAT_META'
OUTPUT_TYPES = ['auto', 'point', 'line', 'area']
QGIS_OUTPUT_TYPES = {QgsProcessing.TypeVectorAnyGeometry: 'auto',
QgsProcessing.TypeVectorPoint: 'point',
QgsProcessing.TypeVectorLine: 'line',
QgsProcessing.TypeVectorPolygon: 'area'}
def __init__(self, descriptionfile):
super().__init__()
self._name = ''
self._display_name = ''
self._group = ''
self.grass7Name = ''
self.params = []
self.hardcodedStrings = []
self.inputLayers = []
self.descriptionFile = descriptionfile
# Default GRASS parameters
self.region = None
self.cellSize = None
self.snaptTolerance = None
self.outputType = None
self.minArea = None
self.alignToResolution = None
# Load parameters from a description file
self.defineCharacteristicsFromFile()
self.numExportedLayers = 0
# Do we need this anymore?
self.uniqueSuffix = str(uuid.uuid4()).replace('-', '')
# Use the ext mechanism
name = self.name().replace('.', '_')
try:
self.module = importlib.import_module(
'processing.algs.grass7.ext.{}'.format(name))
except ImportError:
self.module = None
def createInstance(self):
return self.__class__(self.descriptionFile)
def name(self):
return self._name
def displayName(self):
return self._display_name
def group(self):
return self._group
def icon(self):
return QgsApplication.getThemeIcon("/providerGrass.svg")
def svgIconPath(self):
return QgsApplication.iconPath("providerGrass.svg")
def tr(self, string, context=''):
if context == '':
context = self.__class__.__name__
return QCoreApplication.translate(context, string)
def helpUrl(self):
helpPath = Grass7Utils.grassHelpPath()
if helpPath == '':
return None
if os.path.exists(helpPath):
return QUrl.fromLocalFile(os.path.join(helpPath, '{}.html'.format(self.grass7Name))).toString()
else:
return helpPath + '{}.html'.format(self.grass7Name)
def initAlgorithm(self, config=None):
"""
Algorithm initialization
"""
for p in self.params:
# We use createOutput argument for automatic output creation
res = self.addParameter(p, True)
# File destinations are not automatically added as outputs
if (isinstance(p, QgsProcessingParameterFileDestination)
and p.defaultFileExtension().lower() == 'html'):
self.addOutput(QgsProcessingOutputHtml(p.name(), p.description()))
def defineCharacteristicsFromFile(self):
"""
Create algorithm parameters and outputs from a text file.
"""
with open(self.descriptionFile) as lines:
# First line of the file is the Grass algorithm name
line = lines.readline().strip('\n').strip()
self.grass7Name = line
# Second line if the algorithm name in Processing
line = lines.readline().strip('\n').strip()
self._name = line
self._display_name = QCoreApplication.translate("GrassAlgorithm", line)
if " - " not in self._name:
self._name = self.grass7Name + " - " + self._name
self._display_name = self.grass7Name + " - " + self._display_name
self._name = self._name[:self._name.find(' ')].lower()
# Read the grass group
line = lines.readline().strip('\n').strip()
self._group = QCoreApplication.translate("GrassAlgorithm", line)
hasRasterOutput = False
hasRasterInput = False
hasVectorInput = False
vectorOutputs = False
# Then you have parameters/output definition
line = lines.readline().strip('\n').strip()
while line != '':
try:
line = line.strip('\n').strip()
if line.startswith('Hardcoded'):
self.hardcodedStrings.append(line[len('Hardcoded|'):])
parameter = getParameterFromString(line)
if parameter is not None:
self.params.append(parameter)
if isinstance(parameter, QgsProcessingParameterVectorLayer):
hasVectorInput = True
elif isinstance(parameter, QgsProcessingParameterRasterLayer):
hasRasterInput = True
elif isinstance(parameter, QgsProcessingParameterMultipleLayers):
if parameter.layerType() < 3 or parameter.layerType() == 5:
hasVectorInput = True
elif parameter.layerType() == 3:
hasRasterInput = True
elif isinstance(parameter, QgsProcessingParameterVectorDestination):
vectorOutputs = True
elif isinstance(parameter, QgsProcessingParameterRasterDestination):
hasRasterOutput = True
line = lines.readline().strip('\n').strip()
except Exception as e:
QgsMessageLog.logMessage(self.tr('Could not open GRASS GIS 7 algorithm: {0}\n{1}').format(self.descriptionFile, line), self.tr('Processing'), QgsMessageLog.CRITICAL)
raise e
param = QgsProcessingParameterExtent(
self.GRASS_REGION_EXTENT_PARAMETER,
self.tr('GRASS GIS 7 region extent'),
optional=True
)
param.setFlags(param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
self.params.append(param)
if hasRasterOutput or hasRasterInput:
# Add a cellsize parameter
param = QgsProcessingParameterNumber(
self.GRASS_REGION_CELLSIZE_PARAMETER,
self.tr('GRASS GIS 7 region cellsize (leave 0 for default)'),
type=QgsProcessingParameterNumber.Double,
minValue=0.0, maxValue=sys.float_info.max + 1, defaultValue=0.0
)
param.setFlags(param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
self.params.append(param)
if hasRasterOutput:
# Add a createopt parameter for format export
param = QgsProcessingParameterString(
self.GRASS_RASTER_FORMAT_OPT,
self.tr('Output Rasters format options (createopt)'),
multiLine=True, optional=True
)
param.setFlags(param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
self.params.append(param)
# Add a metadata parameter for format export
param = QgsProcessingParameterString(
self.GRASS_RASTER_FORMAT_META,
self.tr('Output Rasters format metadata options (metaopt)'),
multiLine=True, optional=True
)
param.setFlags(param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
self.params.append(param)
if hasVectorInput:
param = QgsProcessingParameterNumber(self.GRASS_SNAP_TOLERANCE_PARAMETER,
self.tr('v.in.ogr snap tolerance (-1 = no snap)'),
type=QgsProcessingParameterNumber.Double,
minValue=-1.0, maxValue=sys.float_info.max + 1,
defaultValue=-1.0)
param.setFlags(param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
self.params.append(param)
param = QgsProcessingParameterNumber(self.GRASS_MIN_AREA_PARAMETER,
self.tr('v.in.ogr min area'),
type=QgsProcessingParameterNumber.Double,
minValue=0.0, maxValue=sys.float_info.max + 1,
defaultValue=0.0001)
param.setFlags(param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
self.params.append(param)
if vectorOutputs:
param = QgsProcessingParameterEnum(self.GRASS_OUTPUT_TYPE_PARAMETER,
self.tr('v.out.ogr output type'),
self.OUTPUT_TYPES)
param.setFlags(param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
self.params.append(param)
def getDefaultCellSize(self):
"""
Determine a default cell size from all the raster layers.
"""
cellsize = 0.0
layers = [l for l in self.inputLayers if isinstance(l, QgsRasterLayer)]
for layer in layers:
cellsize = max(layer.rasterUnitsPerPixelX(), cellsize)
if cellsize == 0.0:
cellsize = 100.0
return cellsize
def grabDefaultGrassParameters(self, parameters, context):
"""
Imports default GRASS parameters (EXTENT, etc) into
object attributes for faster retrieving.
"""
# GRASS region extent
self.region = self.parameterAsExtent(parameters,
self.GRASS_REGION_EXTENT_PARAMETER,
context)
# GRASS cell size
if self.parameterDefinition(self.GRASS_REGION_CELLSIZE_PARAMETER):
self.cellSize = self.parameterAsDouble(parameters,
self.GRASS_REGION_CELLSIZE_PARAMETER,
context)
# GRASS snap tolerance
self.snapTolerance = self.parameterAsDouble(parameters,
self.GRASS_SNAP_TOLERANCE_PARAMETER,
context)
# GRASS min area
self.minArea = self.parameterAsDouble(parameters,
self.GRASS_MIN_AREA_PARAMETER,
context)
# GRASS output type
self.outputType = self.parameterAsString(parameters,
self.GRASS_OUTPUT_TYPE_PARAMETER,
context)
# GRASS align to resolution
self.alignToResolution = self.parameterAsBool(parameters,
self.GRASS_REGION_ALIGN_TO_RESOLUTION,
context)
def processAlgorithm(self, parameters, context, feedback):
if isWindows():
path = Grass7Utils.grassPath()
if path == '':
raise QgsProcessingException(
self.tr('GRASS GIS 7 folder is not configured. Please '
'configure it before running GRASS GIS 7 algorithms.'))
# Create brand new commands lists
self.commands = []
self.outputCommands = []
self.exportedLayers = {}
# If GRASS session has been created outside of this algorithm then
# get the list of layers loaded in GRASS otherwise start a new
# session
existingSession = Grass7Utils.sessionRunning
if existingSession:
self.exportedLayers = Grass7Utils.getSessionLayers()
else:
Grass7Utils.startGrassSession()
# Handle default GRASS parameters
self.grabDefaultGrassParameters(parameters, context)
# Handle ext functions for inputs/command/outputs
for fName in ['Inputs', 'Command', 'Outputs']:
fullName = 'process{}'.format(fName)
if self.module and hasattr(self.module, fullName):
getattr(self.module, fullName)(self, parameters, context)
else:
getattr(self, fullName)(parameters, context)
# Run GRASS
loglines = []
loglines.append(self.tr('GRASS GIS 7 execution commands'))
for line in self.commands:
feedback.pushCommandInfo(line)
loglines.append(line)
if ProcessingConfig.getSetting(Grass7Utils.GRASS_LOG_COMMANDS):
QgsMessageLog.logMessage("\n".join(loglines), self.tr('Processing'), QgsMessageLog.INFO)
Grass7Utils.executeGrass(self.commands, feedback, self.outputCommands)
# If the session has been created outside of this algorithm, add
# the new GRASS GIS 7 layers to it otherwise finish the session
if existingSession:
Grass7Utils.addSessionLayers(self.exportedLayers)
else:
Grass7Utils.endGrassSession()
# Return outputs map
outputs = {}
for out in self.outputDefinitions():
outName = out.name()
if outName in parameters:
outputs[outName] = parameters[outName]
if isinstance(out, QgsProcessingOutputHtml):
self.convertToHtml(parameters[outName])
return outputs
def processInputs(self, parameters, context):
"""Prepare the GRASS import commands"""
inputs = [p for p in self.parameterDefinitions()
if isinstance(p, (QgsProcessingParameterVectorLayer,
QgsProcessingParameterRasterLayer,
QgsProcessingParameterMultipleLayers))]
for param in inputs:
paramName = param.name()
if not paramName in parameters:
continue
if isinstance(parameters[paramName], str) and len(parameters[paramName]) == 0:
continue
# Raster inputs needs to be imported into temp GRASS DB
if isinstance(param, QgsProcessingParameterRasterLayer):
if paramName not in self.exportedLayers:
self.loadRasterLayerFromParameter(
paramName, parameters, context)
# Vector inputs needs to be imported into temp GRASS DB
elif isinstance(param, QgsProcessingParameterVectorLayer):
if paramName not in self.exportedLayers:
self.loadVectorLayerFromParameter(
paramName, parameters, context)
# TODO: find the best replacement for ParameterTable
#if isinstance(param, ParameterTable):
# pass
# For multiple inputs, process each layer
elif isinstance(param, QgsProcessingParameterMultipleLayers):
layers = self.parameterAsLayerList(parameters, paramName, context)
for idx, layer in enumerate(layers):
layerName = '{}_{}'.format(paramName, idx)
# Add a raster layer
if layer.type() == QgsMapLayer.RasterLayer:
self.loadRasterLayer(layerName, layer)
# Add a vector layer
elif layer.type() == QgsMapLayer.VectorLayer:
self.loadVectorLayer(layerName, layer)
self.postInputs()
def postInputs(self):
"""
After layer imports, we need to update some internal parameters
"""
# If projection has not already be set, use the project
self.setSessionProjectionFromProject()
# Build GRASS region
if self.region.isEmpty():
self.region = QgsProcessingUtils.combineLayerExtents(self.inputLayers)
command = 'g.region n={} s={} e={} w={}'.format(
self.region.yMaximum(), self.region.yMinimum(),
self.region.xMaximum(), self.region.xMinimum()
)
# Handle cell size
if self.parameterDefinition(self.GRASS_REGION_CELLSIZE_PARAMETER):
if self.cellSize:
cellSize = self.cellSize
else:
cellSize = self.getDefaultCellSize()
command += ' res={}'.format(cellSize)
# Handle align to resolution
if self.alignToResolution:
command += ' -a'
# Add the default parameters commands
self.commands.append(command)
QgsMessageLog.logMessage('processInputs end. Commands: {}'.format(self.commands), 'Grass7', QgsMessageLog.INFO)
def processCommand(self, parameters, context, delOutputs=False):
"""
Prepare the GRASS algorithm command
:param parameters:
:param context:
:param delOutputs: do not add outputs to commands.
"""
noOutputs = [o for o in self.parameterDefinitions() if o not in self.destinationParameterDefinitions()]
command = '{} '.format(self.grass7Name)
command += '{}'.join(self.hardcodedStrings)
# Add algorithm command
for param in noOutputs:
paramName = param.name()
value = None
# Exclude default GRASS parameters
if paramName 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,
self.GRASS_RASTER_FORMAT_OPT,
self.GRASS_RASTER_FORMAT_META]:
continue
# Raster and vector layers
if isinstance(param, (QgsProcessingParameterRasterLayer,
QgsProcessingParameterVectorLayer)):
if paramName in self.exportedLayers:
value = self.exportedLayers[paramName]
else:
value = self.parameterAsCompatibleSourceLayerPath(
parameters, paramName, context,
QgsVectorFileWriter.supportedFormatExtensions()
)
# MultipleLayers
elif isinstance(param, QgsProcessingParameterMultipleLayers):
layers = self.parameterAsLayerList(parameters, paramName, context)
values = []
for idx in range(len(layers)):
layerName = '{}_{}'.format(paramName, idx)
values.append(self.exportedLayers[layerName])
value = ','.join(values)
# For booleans, we just add the parameter name
elif isinstance(param, QgsProcessingParameterBoolean):
if self.parameterAsBool(parameters, paramName, context):
command += ' {}'.format(paramName)
# For enumeration, we need to grab the string value
elif isinstance(param, QgsProcessingParameterEnum):
idx = self.parameterAsEnum(parameters, paramName, context)
value = '"{}"'.format(param.options()[idx])
# For strings, we just translate as string
elif isinstance(param, QgsProcessingParameterString):
data = self.parameterAsString(parameters, paramName, context)
# if string is empty, we don't add it
if len(data) > 0:
value = '"{}"'.format(
self.parameterAsString(parameters, paramName, context)
)
# For fields, we just translate as string
elif isinstance(param, QgsProcessingParameterField):
value = '{}'.format(
self.parameterAsString(parameters, paramName, context)
)
# For numbers and points, we translate as a string
elif isinstance(param, (QgsProcessingParameterNumber,
QgsProcessingParameterPoint)):
value = self.parameterAsString(parameters, paramName, context)
# For everything else, we assume that it is a string
else:
value = '"{}"'.format(
self.parameterAsString(parameters, paramName, context)
)
if value:
command += ' {}={}'.format(paramName, value)
# Handle outputs
if not delOutputs:
for out in self.destinationParameterDefinitions():
outName = out.name()
# For File destination
if isinstance(out, QgsProcessingParameterFileDestination):
# for HTML reports, we need to redirect stdout
if out.defaultFileExtension().lower() == 'html':
command += ' > "{}"'.format(
self.parameterAsFileOutput(
parameters, outName, context)
)
else:
command += ' {}="{}"'.format(
outName,
self.parameterAsFileOutput(
parameters, outName, context))
# For folders destination
elif isinstance(out, QgsProcessingParameterFolderDestination):
# We need to add a unique temporary basename
uniqueBasename = outName + self.uniqueSuffix
command += ' {}={}'.format(outName, uniqueBasename)
else:
# We add an output name to make sure it is unique if the session
# uses this algorithm several times.
#value = self.parameterAsOutputLayer(parameters, outName, context)
uniqueOutputName = outName + self.uniqueSuffix
command += ' {}={}'.format(outName, uniqueOutputName)
# Add output file to exported layers, to indicate that
# they are present in GRASS
self.exportedLayers[outName] = uniqueOutputName
command += ' --overwrite'
self.commands.append(command)
QgsMessageLog.logMessage('processCommands end. Commands: {}'.format(self.commands), 'Grass7', QgsMessageLog.INFO)
def vectorOutputType(self, parameters, context):
"""Determine vector output types for outputs"""
self.outType = 'auto'
if self.parameterDefinition(self.GRASS_OUTPUT_TYPE_PARAMETER):
typeidx = self.parameterAsEnum(parameters,
self.GRASS_OUTPUT_TYPE_PARAMETER,
context)
self.outType = ('auto' if typeidx
is None else self.OUTPUT_TYPES[typeidx])
def processOutputs(self, parameters, context):
"""Prepare the GRASS v.out.ogr commands"""
# TODO: support multiple raster formats.
# TODO: support multiple vector formats.
# Determine general vector output type
self.vectorOutputType(parameters, context)
for out in self.destinationParameterDefinitions():
outName = out.name()
if isinstance(out, QgsProcessingParameterRasterDestination):
self.exportRasterLayerFromParameter(outName, parameters, context)
elif isinstance(out, QgsProcessingParameterVectorDestination):
self.exportVectorLayerFromParameter(outName, parameters, context)
elif isinstance(out, QgsProcessingParameterFolderDestination):
self.exportRasterLayersIntoDirectory(outName, parameters, context)
def loadRasterLayerFromParameter(self, name, parameters, context, external=True, band=1):
"""
Creates a dedicated command to load a raster into
the temporary GRASS DB.
:param name: name of the parameter.
:param parameters: algorithm parameters dict.
:param context: algorithm context.
:param external: True if using r.external.
:param band: imports only specified band. None for all bands.
"""
layer = self.parameterAsRasterLayer(parameters, name, context)
self.loadRasterLayer(name, layer, external, band)
def loadRasterLayer(self, name, layer, external=True, band=1):
"""
Creates a dedicated command to load a raster into
the temporary GRASS DB.
:param name: name of the parameter.
:param layer: QgsMapLayer for the raster layer.
:param external: True if using r.external.
:param band: imports only specified band. None for all bands.
"""
self.inputLayers.append(layer)
self.setSessionProjectionFromLayer(layer)
destFilename = 'a' + os.path.basename(getTempFilename())
self.exportedLayers[name] = destFilename
command = '{0} input="{1}" {2}output="{3}" --overwrite -o'.format(
'r.external' if external else 'r.in.gdal',
os.path.normpath(layer.source()),
'band={} '.format(band) if band else '',
destFilename)
self.commands.append(command)
def exportRasterLayerFromParameter(self, name, parameters, context, colorTable=True):
"""
Creates a dedicated command to export a raster from
temporary GRASS DB into a file via gdal.
:param name: name of the parameter.
:param parameters: Algorithm parameters dict.
:param context: Algorithm context.
:param colorTable: preserve color Table.
"""
fileName = os.path.normpath(
self.parameterAsOutputLayer(parameters, name, context))
grassName = '{}{}'.format(name, self.uniqueSuffix)
outFormat = Grass7Utils.getRasterFormatFromFilename(fileName)
createOpt = self.parameterAsString(parameters, self.GRASS_RASTER_FORMAT_OPT, context)
metaOpt = self.parameterAsString(parameters, self.GRASS_RASTER_FORMAT_META, context)
self.exportRasterLayer(grassName, fileName, colorTable, outFormat, createOpt, metaOpt)
def exportRasterLayer(self, grassName, fileName,
colorTable=True, outFormat='GTiff',
createOpt=None,
metaOpt=None):
"""
Creates a dedicated command to export a raster from
temporary GRASS DB into a file via gdal.
:param grassName: name of the raster to export.
:param fileName: file path of raster layer.
:param colorTable: preserve color Table.
:param outFormat: file format for export.
:param createOpt: creation options for format.
:param metatOpt: metadata options for export.
"""
if not createOpt:
if outFormat in Grass7Utils.GRASS_RASTER_FORMATS_CREATEOPTS:
createOpt = Grass7Utils.GRASS_RASTER_FORMATS_CREATEOPTS[outFormat]
for cmd in [self.commands, self.outputCommands]:
# Adjust region to layer before exporting
cmd.append('g.region raster={}'.format(grassName))
cmd.append(
'r.out.gdal -c -m{0} input="{1}" output="{2}" format="{3}" {4}{5} --overwrite'.format(
' -t' if colorTable else '',
grassName, fileName,
outFormat,
' createopt="{}"'.format(createOpt) if createOpt else '',
' metaopt="{}"'.format(metaOpt) if metaOpt else ''
)
)
def exportRasterLayersIntoDirectory(self, name, parameters, context, colorTable=True):
"""
Creates a dedicated loop command to export rasters from
temporary GRASS DB into a directory via gdal.
:param name: name of the output directory parameter.
:param parameters: Algorithm parameters dict.
:param context: Algorithm context.
:param colorTable: preserve color Table.
"""
# Grab directory name and temporary basename
outDir = os.path.normpath(
self.parameterAsString(parameters, name, context))
basename = name + self.uniqueSuffix
# Add a loop export from the basename
for cmd in [self.commands, self.outputCommands]:
# Adjust region to layer before exporting
# TODO: Does-it works under MS-Windows or MacOSX?
cmd.append("for r in $(g.list type=rast pattern='{}*'); do".format(basename))
cmd.append(" r.out.gdal -m{0} input=${{r}} output={1}/${{r}}.tif {2}".format(
' -t' if colorTable else '', outDir,
'--overwrite -c createopt="TFW=YES,COMPRESS=LZW"'
)
)
cmd.append("done")
def loadVectorLayerFromParameter(self, name, parameters, context, external=None):
"""
Creates a dedicated command to load a vector into
the temporary GRASS DB.
:param name: name of the parameter
:param parameters: Parameters of the algorithm.
:param context: Processing context
:param external: use v.external (v.in.ogr if False).
"""
layer = self.parameterAsVectorLayer(parameters, name, context)
self.loadVectorLayer(name, layer, external)
def loadVectorLayer(self, name, layer, external=None):
"""
Creates a dedicated command to load a vector into
temporary GRASS DB.
:param name: name of the parameter
:param layer: QgsMapLayer for the vector layer.
:param external: use v.external (v.in.ogr if False).
"""
# TODO: support selections
# TODO: support multiple input formats
if external is None:
external = ProcessingConfig.getSetting(
Grass7Utils.GRASS_USE_VEXTERNAL)
self.inputLayers.append(layer)
self.setSessionProjectionFromLayer(layer)
destFilename = 'a' + os.path.basename(getTempFilename())
self.exportedLayers[name] = destFilename
command = '{0}{1}{2} input="{3}" output="{4}" --overwrite -o'.format(
'v.external' if external else 'v.in.ogr',
' min_area={}'.format(self.minArea) if not external else '',
' snap={}'.format(self.snapTolerance) if not external else '',
os.path.normpath(layer.source()),
destFilename)
self.commands.append(command)
def exportVectorLayerFromParameter(self, name, parameters, context):
"""
Creates a dedicated command to export a raster from
temporary GRASS DB into a file via gdal.
:param grassName: name of the parameter
:param fileName: file path of raster layer
:param colorTable: preserve color Table.
"""
fileName = os.path.normpath(
self.parameterAsOutputLayer(parameters, name, context))
# Find if there is a dataType
dataType = self.outType
if self.outType == 'auto':
parameter = self.parameterDefinition(name)
if parameter:
layerType = parameter.dataType()
if layerType in self.QGIS_OUTPUT_TYPES:
dataType = self.QGIS_OUTPUT_TYPES[layerType]
grassName = '{}{}'.format(name, self.uniqueSuffix)
self.exportVectorLayer(grassName, fileName, dataType)
def exportVectorLayer(self, grassName, fileName, dataType='auto', layer=None, nocats=False):
"""
Creates a dedicated command to export a vector from
temporary GRASS DB into a file via ogr.
:param grassName: name of the parameter
:param fileName: file path of raster layer
"""
for cmd in [self.commands, self.outputCommands]:
cmd.append(
'v.out.ogr{0} type={1} {2} input="{3}" output="{4}" {5}'.format(
'' if nocats else ' -c',
dataType,
'layer={}'.format(layer) if layer else '',
grassName,
fileName,
'format=ESRI_Shapefile --overwrite'
)
)
def setSessionProjectionFromProject(self):
"""
Set the projection from the project.
We creates a PROJ4 definition which is transmitted to Grass
"""
if not Grass7Utils.projectionSet and iface:
proj4 = iface.mapCanvas().mapSettings().destinationCrs().toProj4()
command = 'g.proj -c proj4="{}"'.format(proj4)
self.commands.append(command)
Grass7Utils.projectionSet = True
def setSessionProjectionFromLayer(self, layer):
"""
Set the projection from a QgsVectorLayer.
We creates a PROJ4 definition which is transmitted to Grass
"""
if not Grass7Utils.projectionSet:
proj4 = str(layer.crs().toProj4())
command = 'g.proj -c proj4="{}"'.format(proj4)
self.commands.append(command)
Grass7Utils.projectionSet = True
def convertToHtml(self, fileName):
# Read HTML contents
lines = []
html = False
with open(fileName, 'r', encoding='utf-8') as f:
lines = f.readlines()
if len(lines) > 1 and '' not in lines[0]:
# Then write into the HTML file
with open(fileName, 'w', encoding='utf-8') as f:
f.write('')
f.write('')
f.write('')
for line in lines:
f.write('{}'.format(line))
f.write('
')
def canExecute(self):
message = Grass7Utils.checkGrassIsInstalled()
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, parameters, context), None
return None, func(self, parameters, context)
return super(Grass7Algorithm, self).checkParameterValues(parameters, context)