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528 lines
22 KiB
Python
528 lines
22 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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GrassAlgorithm.py
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---------------------
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Date : August 2012
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Copyright : (C) 2012 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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__author__ = 'Victor Olaya'
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__date__ = 'August 2012'
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__copyright__ = '(C) 2012, 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 time
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import uuid
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import importlib
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from qgis.core import *
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from PyQt4.QtCore import *
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from PyQt4.QtGui import *
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from qgis.utils import iface
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.ProcessingConfig import ProcessingConfig
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from processing.core.ProcessingLog import ProcessingLog
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from processing.core.GeoAlgorithmExecutionException import \
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GeoAlgorithmExecutionException
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from processing.core.parameters import *
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from processing.core.outputs import *
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from GrassUtils import GrassUtils
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from processing.tools import dataobjects, system
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class GrassAlgorithm(GeoAlgorithm):
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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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GeoAlgorithm.__init__(self)
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self.descriptionFile = descriptionfile
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self.defineCharacteristicsFromFile()
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self.numExportedLayers = 0
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# GRASS console output, needed to do postprocessing in case GRASS
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# dumps results to the console
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self.consoleOutput = []
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def getCopy(self):
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newone = GrassAlgorithm(self.descriptionFile)
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newone.provider = self.provider
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return newone
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def getIcon(self):
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return QIcon(os.path.dirname(__file__) + '/../../images/grass.png')
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def help(self):
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return False, 'http://grass.osgeo.org/grass64/manuals/' + self.grassName + '.html'
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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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infile = open(helpfile)
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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.parameters:
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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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infile.close()
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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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lines = open(self.descriptionFile)
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line = lines.readline().strip('\n').strip()
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self.grassName = line
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line = lines.readline().strip('\n').strip()
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self.name = line
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line = lines.readline().strip('\n').strip()
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self.group = line
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hasRasterOutput = False
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hasVectorInput = False
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vectorOutputs = 0
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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('Parameter'):
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parameter = getParameterFromString(line)
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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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elif line.startswith('*Parameter'):
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param = getParameterFromString(line[1:])
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param.isAdvanced = True
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self.addParameter(param)
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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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line = lines.readline().strip('\n').strip()
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except Exception, e:
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ProcessingLog.addToLog(ProcessingLog.LOG_ERROR,
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self.tr('Could not open GRASS algorithm: %s.\n%s' % (self.descriptionFile, line))
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raise e
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lines.close()
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self.addParameter(ParameterExtent(self.GRASS_REGION_EXTENT_PARAMETER,
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self.tr('GRASS region extent')))
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if hasRasterOutput:
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self.addParameter(ParameterNumber(
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self.GRASS_REGION_CELLSIZE_PARAMETER,
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self.tr('GRASS region cellsize (leave 0 for default)'),
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0, None, 0.0))
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if hasVectorInput:
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param = ParameterNumber(self.GRASS_SNAP_TOLERANCE_PARAMETER,
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'v.in.ogr snap tolerance (-1 = no snap)',
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-1, None, -1.0)
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param.isAdvanced = True
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self.addParameter(param)
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param = ParameterNumber(self.GRASS_MIN_AREA_PARAMETER,
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'v.in.ogr min area', 0, None, 0.0001)
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param.isAdvanced = True
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self.addParameter(param)
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if vectorOutputs == 1:
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param = ParameterSelection(self.GRASS_OUTPUT_TYPE_PARAMETER,
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'v.out.ogr output type',
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self.OUTPUT_TYPES)
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param.isAdvanced = True
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self.addParameter(param)
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def getDefaultCellsize(self):
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cellsize = 0
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for param in self.parameters:
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if param.value:
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if isinstance(param, ParameterRaster):
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if isinstance(param.value, QgsRasterLayer):
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layer = param.value
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else:
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layer = dataobjects.getObjectFromUri(param.value)
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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 = param.value.split(';')
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for layername in layers:
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layer = dataobjects.getObjectFromUri(layername)
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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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if cellsize == 0:
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cellsize = 1
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return cellsize
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def processAlgorithm(self, progress):
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if system.isWindows():
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path = GrassUtils.grassPath()
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if path == '':
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raise GeoAlgorithmExecutionException(
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self.tr('GRASS folder is not configured.\nPlease '
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'configure it before running GRASS algorithms.'))
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commands = []
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self.exportedLayers = {}
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outputCommands = []
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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 = GrassUtils.sessionRunning
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if existingSession:
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self.exportedLayers = GrassUtils.getSessionLayers()
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else:
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GrassUtils.startGrassSession()
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# 1: Export layer to grass mapset
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for param in self.parameters:
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if isinstance(param, ParameterRaster):
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if param.value is None:
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continue
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value = param.value
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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 self.exportedLayers.keys():
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continue
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else:
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self.setSessionProjectionFromLayer(value, commands)
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commands.append(self.exportRasterLayer(value))
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if isinstance(param, ParameterVector):
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if param.value is None:
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continue
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value = param.value
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if value in self.exportedLayers.keys():
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continue
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else:
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self.setSessionProjectionFromLayer(value, commands)
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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 param.value is None:
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continue
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layers = param.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 == ParameterMultipleInput.TYPE_RASTER:
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for layer in layers:
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if layer in self.exportedLayers.keys():
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continue
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else:
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self.setSessionProjectionFromLayer(layer, commands)
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commands.append(self.exportRasterLayer(layer))
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elif param.datatype == ParameterMultipleInput.TYPE_VECTOR_ANY:
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for layer in layers:
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if layer in self.exportedLayers.keys():
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continue
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else:
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self.setSessionProjectionFromLayer(layer, commands)
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commands.append(self.exportVectorLayer(layer))
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self.setSessionProjectionFromProject(commands)
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region = \
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str(self.getParameterValue(self.GRASS_REGION_EXTENT_PARAMETER))
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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())
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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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commands.append(command)
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# 2: Set parameters and outputs
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command = self.grassName
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for param in self.parameters:
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if param.value is None or param.value == '':
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continue
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if param.name == self.GRASS_REGION_CELLSIZE_PARAMETER \
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or param.name == self.GRASS_REGION_EXTENT_PARAMETER \
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or param.name == self.GRASS_MIN_AREA_PARAMETER or param.name \
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== self.GRASS_SNAP_TOLERANCE_PARAMETER or param.name \
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== self.GRASS_OUTPUT_TYPE_PARAMETER or param.name \
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== 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 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 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, ParameterSelection):
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idx = int(param.value)
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command += ' ' + param.name + '=' + str(param.options[idx])
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elif isinstance(param, ParameterString):
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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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uniqueSufix = str(uuid.uuid4()).replace('-', '')
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for out in self.outputs:
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if isinstance(out, OutputFile):
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if out.name == 'outputtext':
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# The 'outputtext' file is generated by piping output
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# from GRASS, is not an actual grass command
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command += ' > ' + out.value
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else:
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command += ' ' + out.name + '="' + out.value + '"'
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elif not isinstance(out, OutputHTML):
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# Html files are not generated by GRASS, only by us to
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# decorate GRASS output, so we skip them. An output name
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# to make sure it is unique if the session uses this
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# algorithm several times.
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uniqueOutputName = out.name + uniqueSufix
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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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commands.append(command)
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# 3: Export resulting layers to a format that qgis can read
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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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commands.append('g.region rast=' + out.name + uniqueSufix)
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outputCommands.append('g.region rast=' + out.name
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+ uniqueSufix)
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if self.grassName == 'r.composite':
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command = 'r.out.tiff -t --verbose'
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command += ' input='
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command += out.name + uniqueSufix
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command += ' output="' + filename + '"'
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commands.append(command)
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outputCommands.append(command)
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else:
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command = 'r.out.gdal -c createopt="TFW=YES,COMPRESS=LZW"'
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command += ' input='
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if self.grassName == 'r.horizon':
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command += out.name + uniqueSufix + '_0'
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else:
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command += out.name + uniqueSufix
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command += ' output="' + filename + '"'
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commands.append(command)
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outputCommands.append(command)
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if isinstance(out, OutputVector):
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filename = out.value
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command = 'v.out.ogr -s -c -e -z input=' + out.name + uniqueSufix
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command += ' dsn="' + os.path.dirname(out.value) + '"'
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command += ' format=ESRI_Shapefile'
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command += ' olayer=' + os.path.basename(out.value)[:-4]
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typeidx = \
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self.getParameterValue(self.GRASS_OUTPUT_TYPE_PARAMETER)
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outtype = ('auto' if typeidx
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is None else self.OUTPUT_TYPES[typeidx])
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command += ' type=' + outtype
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commands.append(command)
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outputCommands.append(command)
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# 4: Run GRASS
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loglines = []
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loglines.append(self.tr('GRASS execution commands'))
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for line in commands:
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progress.setCommand(line)
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loglines.append(line)
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if ProcessingConfig.getSetting(GrassUtils.GRASS_LOG_COMMANDS):
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ProcessingLog.addToLog(ProcessingLog.LOG_INFO, loglines)
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self.consoleOutput = GrassUtils.executeGrass(commands, progress,
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outputCommands)
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self.postProcessResults()
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# If the session has been created outside of this algorithm, add
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# the new GRASS layers to it otherwise finish the session
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if existingSession:
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GrassUtils.addSessionLayers(self.exportedLayers)
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else:
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GrassUtils.endGrassSession()
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def postProcessResults(self):
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name = self.commandLineName().replace('.', '_')[len('grass:'):]
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try:
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module = importlib.import_module('processing.algs.grass.ext.' + name)
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except ImportError:
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return
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if hasattr(module, 'postProcessResults'):
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func = getattr(module, 'postProcessResults')
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func(self)
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def exportVectorLayer(self, orgFilename):
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# TODO: improve this. We are now exporting if it is not a shapefile,
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# but the functionality of v.in.ogr could be used for this.
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# We also export if there is a selection
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if not os.path.exists(orgFilename) or not orgFilename.endswith('shp'):
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layer = dataobjects.getObjectFromUri(orgFilename, False)
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if layer:
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filename = dataobjects.exportVectorLayer(layer)
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else:
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layer = dataobjects.getObjectFromUri(orgFilename, False)
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if layer:
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useSelection = \
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ProcessingConfig.getSetting(ProcessingConfig.USE_SELECTED)
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if useSelection and layer.selectedFeatureCount() != 0:
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filename = dataobjects.exportVectorLayer(layer)
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else:
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filename = orgFilename
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else:
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filename = orgFilename
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destFilename = self.getTempFilename()
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self.exportedLayers[orgFilename] = destFilename
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command = 'v.in.ogr'
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min_area = self.getParameterValue(self.GRASS_MIN_AREA_PARAMETER)
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command += ' min_area=' + str(min_area)
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snap = self.getParameterValue(self.GRASS_SNAP_TOLERANCE_PARAMETER)
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command += ' snap=' + str(snap)
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command += ' dsn="' + os.path.dirname(filename) + '"'
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command += ' layer=' + os.path.basename(filename)[:-4]
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command += ' output=' + destFilename
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command += ' --overwrite -o'
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return command
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def setSessionProjectionFromProject(self, commands):
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if not GrassUtils.projectionSet:
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proj4 = iface.mapCanvas().mapRenderer().destinationCrs().toProj4()
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command = 'g.proj'
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command += ' -c'
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command += ' proj4="' + proj4 + '"'
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commands.append(command)
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GrassUtils.projectionSet = True
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def setSessionProjectionFromLayer(self, layer, commands):
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if not GrassUtils.projectionSet:
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qGisLayer = dataobjects.getObjectFromUri(layer)
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if qGisLayer:
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proj4 = str(qGisLayer.crs().toProj4())
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command = 'g.proj'
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command += ' -c'
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command += ' proj4="' + proj4 + '"'
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commands.append(command)
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GrassUtils.projectionSet = True
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def exportRasterLayer(self, layer):
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destFilename = self.getTempFilename()
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self.exportedLayers[layer] = destFilename
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command = 'r.external'
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command += ' input="' + layer + '"'
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command += ' band=1'
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command += ' output=' + destFilename
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command += ' --overwrite -o -r'
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return command
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def getTempFilename(self):
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filename = 'tmp' + str(time.time()).replace('.', '') \
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+ str(system.getNumExportedLayers())
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return filename
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def commandLineName(self):
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return 'grass:' + self.name[:self.name.find(' ')]
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def checkBeforeOpeningParametersDialog(self):
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msg = GrassUtils.checkGrassIsInstalled()
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if msg is not None:
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html = self.tr(
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'<p>This algorithm requires GRASS to be run. Unfortunately, '
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'it seems that GRASS is not installed in your system, or it '
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'is not correctly configured to be used from QGIS</p>'
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'<p><a href="http://docs.qgis.org/testing/en/docs/user_manual/processing/3rdParty.html">Click here</a> '
|
|
'to know more about how to install and configure GRASS to be used with QGIS</p>')
|
|
return html
|
|
|
|
def checkParameterValuesBeforeExecuting(self):
|
|
name = self.commandLineName().replace('.', '_')[len('grass:'):]
|
|
try:
|
|
module = importlib.import_module('processing.algs.grass.ext.' + name)
|
|
except ImportError:
|
|
return
|
|
if hasattr(module, 'checkParameterValuesBeforeExecuting'):
|
|
func = getattr(module, 'checkParameterValuesBeforeExecuting')
|
|
return func(self)
|
|
|
|
def getPostProcessingErrorMessage(self, wrongLayers):
|
|
html = GeoAlgorithm.getPostProcessingErrorMessage(self, wrongLayers)
|
|
msg = GrassUtils.checkGrassIsInstalled(True)
|
|
html += self.tr(
|
|
'<p>This algorithm requires GRASS to be run. A test to check '
|
|
'if GRASS is correctly installed and configured in your system '
|
|
'has been performed, with the following result:</p><ul><i>')
|
|
if msg is None:
|
|
html += self.tr('GRASS seems to be correctly installed and '
|
|
'configured</i></li></ul>')
|
|
else:
|
|
html += msg + '</i></li></ul>'
|
|
html += self.tr(
|
|
'<p><a href="http://docs.qgis.org/testing/en/docs/user_manual/processing/3rdParty.html">Click here</a> '
|
|
'to know more about how to install and configure GRASS to be used with QGIS</p>')
|
|
|
|
return html
|