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QGIS/python/plugins/processing/algs/grass7/Grass7Algorithm.py
Victor Olaya 293ac60722 [processing] removed interface module 
now all access to the interface is done through qgis.utils.iface
2014-05-21 17:35:48 +02:00

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# -*- coding: utf-8 -*-
"""
***************************************************************************
Grass7Algorithm.py
---------------------
Date : April 2014
Copyright : (C) 2014 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__ = 'April 2014'
__copyright__ = '(C) 2014, Victor Olaya'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'
import os
import time
import uuid
import importlib
from qgis.core import *
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from qgis.utils import iface
from processing.core.GeoAlgorithm import GeoAlgorithm
from processing.core.ProcessingConfig import ProcessingConfig
from processing.core.ProcessingLog import ProcessingLog
from processing.core.WrongHelpFileException import WrongHelpFileException
from processing.core.GeoAlgorithmExecutionException import \
GeoAlgorithmExecutionException
from processing.parameters.ParameterFactory import ParameterFactory
from processing.parameters.ParameterTable import ParameterTable
from processing.parameters.ParameterMultipleInput import ParameterMultipleInput
from processing.parameters.ParameterRaster import ParameterRaster
from processing.parameters.ParameterVector import ParameterVector
from processing.parameters.ParameterBoolean import ParameterBoolean
from processing.parameters.ParameterExtent import ParameterExtent
from processing.parameters.ParameterNumber import ParameterNumber
from processing.parameters.ParameterString import ParameterString
from processing.parameters.ParameterSelection import ParameterSelection
from processing.outputs.OutputRaster import OutputRaster
from processing.outputs.OutputHTML import OutputHTML
from processing.outputs.OutputVector import OutputVector
from processing.outputs.OutputFactory import OutputFactory
from processing.outputs.OutputFile import OutputFile
from Grass7Utils import Grass7Utils
from processing.tools import dataobjects, system
class Grass7Algorithm(GeoAlgorithm):
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 = '-a_r.region'
OUTPUT_TYPES = ['auto', 'point', 'line', 'area']
def __init__(self, descriptionfile):
GeoAlgorithm.__init__(self)
self.descriptionFile = descriptionfile
self.defineCharacteristicsFromFile()
self.numExportedLayers = 0
# GRASS GIS 7 console output, needed to do postprocessing in case GRASS
# dumps results to the console
self.consoleOutput = []
def getCopy(self):
newone = Grass7Algorithm(self.descriptionFile)
newone.provider = self.provider
return newone
def getIcon(self):
return QIcon(os.path.dirname(__file__) + '/../../images/grass.png')
def help(self):
return False, 'http://grass.osgeo.org/grass70/manuals/' + self.grassName \
+ '.html'
def getParameterDescriptions(self):
descs = {}
try:
helpfile = self.helpFile()
except WrongHelpFileException:
return descs
if helpfile:
try:
infile = open(helpfile)
lines = infile.readlines()
for i in range(len(lines)):
if lines[i].startswith('<DT><b>'):
for param in self.parameters:
searchLine = '<b>' + param.name + '</b>'
if searchLine in lines[i]:
i += 1
descs[param.name] = (lines[i])[4:-6]
break
infile.close()
except Exception:
pass
return descs
def defineCharacteristicsFromFile(self):
lines = open(self.descriptionFile)
line = lines.readline().strip('\n').strip()
self.grassName = line
line = lines.readline().strip('\n').strip()
self.name = line
line = lines.readline().strip('\n').strip()
self.group = line
hasRasterOutput = False
hasVectorInput = False
vectorOutputs = 0
while line != '':
try:
line = line.strip('\n').strip()
if line.startswith('Parameter'):
parameter = ParameterFactory.getFromString(line)
self.addParameter(parameter)
if isinstance(parameter, ParameterVector):
hasVectorInput = True
if isinstance(parameter, ParameterMultipleInput) \
and parameter.datatype < 3:
hasVectorInput = True
elif line.startswith('*Parameter'):
param = ParameterFactory.getFromString(line[1:])
param.isAdvanced = True
self.addParameter(param)
else:
output = OutputFactory.getFromString(line)
self.addOutput(output)
if isinstance(output, OutputRaster):
hasRasterOutput = True
elif isinstance(output, OutputVector):
vectorOutputs += 1
line = lines.readline().strip('\n').strip()
except Exception, e:
ProcessingLog.addToLog(ProcessingLog.LOG_ERROR,
'Could not open GRASS GIS 7 algorithm: '
+ self.descriptionFile + '\n' + line)
raise e
lines.close()
self.addParameter(ParameterExtent(self.GRASS_REGION_EXTENT_PARAMETER,
'GRASS GIS 7 region extent'))
if hasRasterOutput:
self.addParameter(ParameterNumber(
self.GRASS_REGION_CELLSIZE_PARAMETER,
'GRASS GIS 7 region cellsize (leave 0 for default)',
0, None, 0.0))
if hasVectorInput:
param = ParameterNumber(self.GRASS_SNAP_TOLERANCE_PARAMETER,
'v.in.ogr snap tolerance (-1 = no snap)',
-1, None, -1.0)
param.isAdvanced = True
self.addParameter(param)
param = ParameterNumber(self.GRASS_MIN_AREA_PARAMETER,
'v.in.ogr min area', 0, None, 0.0001)
param.isAdvanced = True
self.addParameter(param)
if vectorOutputs == 1:
param = ParameterSelection(self.GRASS_OUTPUT_TYPE_PARAMETER,
'v.out.ogr output type',
self.OUTPUT_TYPES)
param.isAdvanced = True
self.addParameter(param)
def getDefaultCellsize(self):
cellsize = 0
for param in self.parameters:
if param.value:
if isinstance(param, ParameterRaster):
if isinstance(param.value, QgsRasterLayer):
layer = param.value
else:
layer = dataobjects.getObjectFromUri(param.value)
cellsize = max(cellsize, (layer.extent().xMaximum()
- layer.extent().xMinimum())
/ layer.width())
elif isinstance(param, ParameterMultipleInput):
layers = param.value.split(';')
for layername in layers:
layer = dataobjects.getObjectFromUri(layername)
if isinstance(layer, QgsRasterLayer):
cellsize = max(cellsize,
(layer.extent().xMaximum()
- layer.extent().xMinimum())
/ layer.width())
if cellsize == 0:
cellsize = 1
return cellsize
def processAlgorithm(self, progress):
if system.isWindows():
path = Grass7Utils.grassPath()
if path == '':
raise GeoAlgorithmExecutionException('GRASS GIS 7 folder is not \
configured.\nPlease configure it before running GRASS GIS 7\
algorithms.')
commands = []
self.exportedLayers = {}
outputCommands = []
# 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.startGrass7Session()
# 1: Export layer to grass mapset
for param in self.parameters:
if isinstance(param, ParameterRaster):
if param.value is None:
continue
value = param.value
# Check if the layer hasn't already been exported in, for
# example, previous GRASS calls in this session
if value in self.exportedLayers.keys():
continue
else:
self.setSessionProjectionFromLayer(value, commands)
commands.append(self.exportRasterLayer(value))
if isinstance(param, ParameterVector):
if param.value is None:
continue
value = param.value
if value in self.exportedLayers.keys():
continue
else:
self.setSessionProjectionFromLayer(value, commands)
commands.append(self.exportVectorLayer(value))
if isinstance(param, ParameterTable):
pass
if isinstance(param, ParameterMultipleInput):
if param.value is None:
continue
layers = param.value.split(';')
if layers is None or len(layers) == 0:
continue
if param.datatype == ParameterMultipleInput.TYPE_RASTER:
for layer in layers:
if layer in self.exportedLayers.keys():
continue
else:
self.setSessionProjectionFromLayer(layer, commands)
commands.append(self.exportRasterLayer(layer))
elif param.datatype == ParameterMultipleInput.TYPE_VECTOR_ANY:
for layer in layers:
if layer in self.exportedLayers.keys():
continue
else:
self.setSessionProjectionFromLayer(layer, commands)
commands.append(self.exportVectorLayer(layer))
self.setSessionProjectionFromProject(commands)
region = \
str(self.getParameterValue(self.GRASS_REGION_EXTENT_PARAMETER))
regionCoords = region.split(',')
command = 'g.region'
command += ' n=' + str(regionCoords[3])
command += ' s=' + str(regionCoords[2])
command += ' e=' + str(regionCoords[1])
command += ' w=' + str(regionCoords[0])
cellsize = self.getParameterValue(self.GRASS_REGION_CELLSIZE_PARAMETER)
if cellsize:
command += ' res=' + str(cellsize)
else:
command += ' res=' + str(self.getDefaultCellsize())
alignToResolution = \
self.getParameterValue(self.GRASS_REGION_ALIGN_TO_RESOLUTION)
if alignToResolution:
command += ' -a'
commands.append(command)
# 2: Set parameters and outputs
command = self.grassName
for param in self.parameters:
if param.value is None or param.value == '':
continue
if param.name == self.GRASS_REGION_CELLSIZE_PARAMETER \
or param.name == self.GRASS_REGION_EXTENT_PARAMETER \
or param.name == self.GRASS_MIN_AREA_PARAMETER or param.name \
== self.GRASS_SNAP_TOLERANCE_PARAMETER or param.name \
== self.GRASS_OUTPUT_TYPE_PARAMETER or param.name \
== self.GRASS_REGION_ALIGN_TO_RESOLUTION:
continue
if isinstance(param, (ParameterRaster, ParameterVector)):
value = param.value
if value in self.exportedLayers.keys():
command += ' ' + param.name + '=' \
+ self.exportedLayers[value]
else:
command += ' ' + param.name + '=' + value
elif isinstance(param, ParameterMultipleInput):
s = param.value
for layer in self.exportedLayers.keys():
s = s.replace(layer, self.exportedLayers[layer])
s = s.replace(';', ',')
command += ' ' + param.name + '=' + s
elif isinstance(param, ParameterBoolean):
if param.value:
command += ' ' + param.name
elif isinstance(param, ParameterSelection):
idx = int(param.value)
command += ' ' + param.name + '=' + str(param.options[idx])
elif isinstance(param, ParameterString):
command += ' ' + param.name + '="' + str(param.value) + '"'
else:
command += ' ' + param.name + '="' + str(param.value) + '"'
uniqueSufix = str(uuid.uuid4()).replace('-', '')
for out in self.outputs:
if isinstance(out, OutputFile):
if out.name == 'outputtext':
# The 'outputtext' file is generated by piping output
# from GRASS, is not an actual grass command
command += ' > ' + out.value
else:
command += ' ' + out.name + '="' + out.value + '"'
elif not isinstance(out, OutputHTML):
# Html files are not generated by GRASS, only by us to
# decorate GRASS output, so we skip them. An output name
# to make sure it is unique if the session uses this
# algorithm several times.
uniqueOutputName = out.name + uniqueSufix
command += ' ' + out.name + '=' + uniqueOutputName
# Add output file to exported layers, to indicate that
# they are present in GRASS
self.exportedLayers[out.value] = uniqueOutputName
command += ' --overwrite'
commands.append(command)
# 3: Export resulting layers to a format that qgis can read
for out in self.outputs:
if isinstance(out, OutputRaster):
filename = out.value
# Raster layer output: adjust region to layer before
# exporting
commands.append('g.region rast=' + out.name + uniqueSufix)
outputCommands.append('g.region rast=' + out.name
+ uniqueSufix)
if self.grassName == 'r.composite':
command = 'r.out.tiff -t --verbose'
command += ' input='
command += out.name + uniqueSufix
command += ' output="' + filename + '"'
commands.append(command)
outputCommands.append(command)
else:
command = 'r.out.gdal -c createopt="TFW=YES,COMPRESS=LZW"'
command += ' input='
if self.grassName == 'r.horizon':
command += out.name + uniqueSufix + '_0'
else:
command += out.name + uniqueSufix
command += ' output="' + filename + '"'
commands.append(command)
outputCommands.append(command)
if isinstance(out, OutputVector):
filename = out.value
# FIXME: check if needed: -c Also export features without category (not labeled). Otherwise only features with category are exported.
command = 'v.out.ogr -s -e input=' + out.name + uniqueSufix
command += ' dsn="' + os.path.dirname(out.value) + '"'
command += ' format=ESRI_Shapefile'
command += ' olayer=' + os.path.basename(out.value)[:-4]
typeidx = \
self.getParameterValue(self.GRASS_OUTPUT_TYPE_PARAMETER)
outtype = ('auto' if typeidx
is None else self.OUTPUT_TYPES[typeidx])
command += ' type=' + outtype
commands.append(command)
outputCommands.append(command)
# 4: Run GRASS
loglines = []
loglines.append('GRASS GIS 7 execution commands')
for line in commands:
progress.setCommand(line)
loglines.append(line)
if ProcessingConfig.getSetting(Grass7Utils.GRASS_LOG_COMMANDS):
ProcessingLog.addToLog(ProcessingLog.LOG_INFO, loglines)
self.consoleOutput = Grass7Utils.executeGrass7(commands, progress,
outputCommands)
self.postProcessResults()
# 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.endGrass7Session()
def postProcessResults(self):
name = self.commandLineName().replace('.', '_')[len('grass7:'):]
try:
module = importlib.import_module('processing.algs.grass7.ext.' + name)
except ImportError:
return
if hasattr(module, 'postProcessResults'):
func = getattr(module, 'postProcessResults')
func(self)
def exportVectorLayer(self, orgFilename):
# 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 = dataobjects.getObjectFromUri(orgFilename, False)
if layer:
filename = dataobjects.exportVectorLayer(layer)
else:
layer = dataobjects.getObjectFromUri(orgFilename, False)
if layer:
useSelection = \
ProcessingConfig.getSetting(ProcessingConfig.USE_SELECTED)
if useSelection and layer.selectedFeatureCount() != 0:
filename = dataobjects.exportVectorLayer(layer)
else:
filename = orgFilename
else:
filename = orgFilename
destFilename = 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 += ' dsn="' + 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:
proj4 = iface.mapCanvas().mapRenderer().destinationCrs().toProj4()
command = 'g.proj'
command += ' -c'
command += ' proj4="' + proj4 + '"'
commands.append(command)
Grass7Utils.projectionSet = True
def setSessionProjectionFromLayer(self, layer, commands):
if not Grass7Utils.projectionSet:
qGisLayer = dataobjects.getObjectFromUri(layer)
if qGisLayer:
proj4 = str(qGisLayer.crs().toProj4())
command = 'g.proj'
command += ' -c'
command += ' proj4="' + proj4 + '"'
commands.append(command)
Grass7Utils.projectionSet = True
def exportRasterLayer(self, layer):
destFilename = 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):
filename = 'tmp' + str(time.time()).replace('.', '') \
+ str(system.getNumExportedLayers())
return filename
def commandLineName(self):
return 'grass7:' + self.name[:self.name.find(' ')]
def checkBeforeOpeningParametersDialog(self):
msg = Grass7Utils.checkGrass7IsInstalled()
if msg is not None:
html = '<p>This algorithm requires GRASS GIS 7 to be run. \
Unfortunately, it seems that GRASS GIS 7 is not installed in \
your system, or it is not correctly configured to be used \
from QGIS</p>'
html += '<p><a href="http://docs.qgis.org/2.0/en/docs/user_manual/processing/3rdParty.html">Click here</a> to know more about how to install and configure GRASS GIS 7 to be used with QGIS</p>' # FIXME update URL or page
return html
def checkParameterValuesBeforeExecuting(self):
name = self.commandLineName().replace('.', '_')[len('grass7:'):]
try:
module = importlib.import_module('processing.algs.grass7.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 = Grass7Utils.checkGrass7IsInstalled(True)
html += '<p>This algorithm requires GRASS GIS 7 to be run. A test \
to check if GRASS GIS 7 is correctly installed and configured in \
your system has been performed, with the following \
result:</p><ul><i>'
if msg is None:
html += 'GRASS GIS 7 seems to be correctly installed and \
configured</i></li></ul>'
else:
html += msg + '</i></li></ul>'
html += '<p><a href= "http://docs.qgis.org/2.0/en/docs/user_manual/processing/3rdParty.html">Click here</a> to know more about how to install and configure GRASS GIS 7 to be used with QGIS</p>'
return html
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