# -*- coding: utf-8 -*-
"""
***************************************************************************
SagaAlgorithm.py
---------------------
Date : August 2012
Copyright : (C) 2012 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__ = 'August 2012'
__copyright__ = '(C) 2012, Victor Olaya'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'
import os
import importlib
from qgis.core import *
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from processing.core.GeoAlgorithm import GeoAlgorithm
from processing.core.ProcessingConfig import ProcessingConfig
from processing.core.ProcessingLog import ProcessingLog
from processing.core.GeoAlgorithmExecutionException import \
GeoAlgorithmExecutionException
from processing.parameters.ParameterTable import ParameterTable
from processing.parameters.ParameterMultipleInput import ParameterMultipleInput
from processing.parameters.ParameterRaster import ParameterRaster
from processing.parameters.ParameterNumber import ParameterNumber
from processing.parameters.ParameterSelection import ParameterSelection
from processing.parameters.ParameterTableField import ParameterTableField
from processing.parameters.ParameterExtent import ParameterExtent
from processing.parameters.ParameterFixedTable import ParameterFixedTable
from processing.parameters.ParameterVector import ParameterVector
from processing.parameters.ParameterBoolean import ParameterBoolean
from processing.parameters.ParameterFactory import ParameterFactory
from processing.outputs.OutputFactory import OutputFactory
from processing.outputs.OutputTable import OutputTable
from processing.outputs.OutputVector import OutputVector
from processing.outputs.OutputRaster import OutputRaster
from processing.saga.SagaUtils import SagaUtils
from processing.saga.SagaGroupNameDecorator import SagaGroupNameDecorator
from processing.tools import dataobjects
from processing.tools.system import *
sessionExportedLayers = {}
class SagaAlgorithm(GeoAlgorithm):
OUTPUT_EXTENT = 'OUTPUT_EXTENT'
def __init__(self, descriptionfile):
# True if it should resample
self.resample = True
# In case several non-matching raster layers are used as input
GeoAlgorithm.__init__(self)
self.descriptionFile = descriptionfile
self.defineCharacteristicsFromFile()
if self.resample:
# Reconsider resampling policy now that we know the input
# parameters
self.resample = self.setResamplingPolicy()
def getCopy(self):
newone = SagaAlgorithm(self.descriptionFile)
newone.provider = self.provider
return newone
def setResamplingPolicy(self):
count = 0
for param in self.parameters:
if isinstance(param, ParameterRaster):
count += 1
if isinstance(param, ParameterMultipleInput):
if param.datatype == ParameterMultipleInput.TYPE_RASTER:
return True
return count > 1
def getIcon(self):
return QIcon(os.path.dirname(__file__) + '/../images/saga.png')
def defineCharacteristicsFromFile(self):
self.hardcodedStrings = []
lines = open(self.descriptionFile)
line = lines.readline().strip('\n').strip()
self.name = line
if '|' in self.name:
tokens = self.name.split('|')
self.name = tokens[0]
self.cmdname = tokens[1]
else:
self.cmdname = self.name
self.name = self.name[0].upper() + self.name[1:].lower()
line = lines.readline().strip('\n').strip()
self.undecoratedGroup = line
self.group = SagaGroupNameDecorator.getDecoratedName(
self.undecoratedGroup)
while line != '':
line = line.strip('\n').strip()
if line.startswith('Hardcoded'):
self.hardcodedStrings.append(line[len('Harcoded|') + 1:])
elif line.startswith('Parameter'):
self.addParameter(ParameterFactory.getFromString(line))
elif line.startswith('DontResample'):
self.resample = False
elif line.startswith('Extent'):
# An extent parameter that wraps 4 SAGA numerical parameters
self.extentParamNames = line[6:].strip().split(' ')
self.addParameter(ParameterExtent(self.OUTPUT_EXTENT,
'Output extent', '0,1,0,1'))
else:
self.addOutput(OutputFactory.getFromString(line))
line = lines.readline().strip('\n').strip()
lines.close()
def calculateResamplingExtent(self):
"""This method calculates the resampling extent, but it might
set self.resample to False if, with the current layers, there
is no need to resample.
"""
auto = ProcessingConfig.getSetting(SagaUtils.SAGA_AUTO_RESAMPLING)
if auto:
first = True
self.inputExtentsCount = 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)
self.addToResamplingExtent(layer, first)
first = False
if isinstance(param, ParameterMultipleInput):
if param.datatype \
== ParameterMultipleInput.TYPE_RASTER:
layers = param.value.split(';')
for layername in layers:
layer = dataobjects.getObjectFromUri(layername)
self.addToResamplingExtent(layer, first)
first = False
if self.inputExtentsCount < 2:
self.resample = False
else:
self.xmin = ProcessingConfig.getSetting(
SagaUtils.SAGA_RESAMPLING_REGION_XMIN)
self.xmax = ProcessingConfig.getSetting(
SagaUtils.SAGA_RESAMPLING_REGION_XMAX)
self.ymin = ProcessingConfig.getSetting(
SagaUtils.SAGA_RESAMPLING_REGION_YMIN)
self.ymax = ProcessingConfig.getSetting(
SagaUtils.SAGA_RESAMPLING_REGION_YMAX)
self.cellsize = ProcessingConfig.getSetting(
SagaUtils.SAGA_RESAMPLING_REGION_CELLSIZE)
def addToResamplingExtent(self, layer, first):
if layer is None:
return
if first:
self.inputExtentsCount = 1
self.xmin = layer.extent().xMinimum()
self.xmax = layer.extent().xMaximum()
self.ymin = layer.extent().yMinimum()
self.ymax = layer.extent().yMaximum()
self.cellsize = (layer.extent().xMaximum()
- layer.extent().xMinimum()) / layer.width()
else:
cellsize = (layer.extent().xMaximum() -
layer.extent().xMinimum()) / layer.width()
if self.xmin != layer.extent().xMinimum() or self.xmax \
!= layer.extent().xMaximum() or self.ymin \
!= layer.extent().yMinimum() or self.ymax \
!= layer.extent().yMaximum() or self.cellsize != cellsize:
self.xmin = min(self.xmin, layer.extent().xMinimum())
self.xmax = max(self.xmax, layer.extent().xMaximum())
self.ymin = min(self.ymin, layer.extent().yMinimum())
self.ymax = max(self.ymax, layer.extent().yMaximum())
self.cellsize = max(self.cellsize, cellsize)
self.inputExtentsCount += 1
def processAlgorithm(self, progress):
if isWindows():
path = SagaUtils.sagaPath()
if path == '':
raise GeoAlgorithmExecutionException(
'SAGA folder is not configured.\nPlease configure \
it before running SAGA algorithms.')
commands = list()
self.exportedLayers = {}
self.preProcessInputs()
# 1: Export rasters to sgrd and vectors to shp
# Tables must be in dbf format. We check that.
if self.resample:
self.calculateResamplingExtent()
for param in self.parameters:
if isinstance(param, ParameterRaster):
if param.value is None:
continue
value = param.value
if not value.endswith('sgrd'):
exportCommand = self.exportRasterLayer(value)
if exportCommand is not None:
commands.append(exportCommand)
if self.resample:
commands.append(self.resampleRasterLayer(value))
if isinstance(param, ParameterVector):
if param.value is None:
continue
layer = dataobjects.getObjectFromUri(param.value, False)
if layer:
filename = dataobjects.exportVectorLayer(layer)
self.exportedLayers[param.value] = filename
elif not param.value.endswith('shp'):
raise GeoAlgorithmExecutionException(
'Unsupported file format')
if isinstance(param, ParameterTable):
if param.value is None:
continue
table = dataobjects.getObjectFromUri(param.value, False)
if table:
filename = dataobjects.exportTable(table)
self.exportedLayers[param.value] = filename
elif not param.value.endswith('shp'):
raise GeoAlgorithmExecutionException(
'Unsupported file format')
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 layerfile in layers:
if not layerfile.endswith('sgrd'):
exportCommand = self.exportRasterLayer(layerfile)
if exportCommand is not None:
commands.append(exportCommand)
if self.resample:
commands.append(
self.resampleRasterLayer(layerfile))
elif param.datatype == ParameterMultipleInput.TYPE_VECTOR_ANY:
for layerfile in layers:
layer = dataobjects.getObjectFromUri(layerfile, False)
if layer:
filename = dataobjects.exportVectorLayer(layer)
self.exportedLayers[layerfile] = filename
elif not layerfile.endswith('shp'):
raise GeoAlgorithmExecutionException(
'Unsupported file format')
# 2: Set parameters and outputs
saga208 = ProcessingConfig.getSetting(SagaUtils.SAGA_208)
if isWindows() or isMac() or not saga208:
command = self.undecoratedGroup + ' "' + self.cmdname + '"'
else:
command = 'lib' + self.undecoratedGroup + ' "' + self.cmdname + '"'
if self.hardcodedStrings:
for s in self.hardcodedStrings:
command += ' ' + s
for param in self.parameters:
if param.value is None:
continue
if isinstance(param, (ParameterRaster, ParameterVector,
ParameterTable)):
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])
command += ' -' + param.name + ' "' + s + '"'
elif isinstance(param, ParameterBoolean):
if param.value:
command += ' -' + param.name
elif isinstance(param, ParameterFixedTable):
tempTableFile = getTempFilename('txt')
f = open(tempTableFile, 'w')
f.write('\t'.join([col for col in param.cols]) + '\n')
values = param.value.split(',')
for i in range(0, len(values), 3):
s = values[i] + '\t' + values[i + 1] + '\t' + values[i
+ 2] + '\n'
f.write(s)
f.close()
command += ' -' + param.name + ' "' + tempTableFile + '"'
elif isinstance(param, ParameterExtent):
# 'We have to substract/add half cell size, since SAGA is
# center based, not corner based
halfcell = self.getOutputCellsize() / 2
offset = [halfcell, -halfcell, halfcell, -halfcell]
values = param.value.split(',')
for i in range(4):
command += ' -' + self.extentParamNames[i] + ' ' \
+ str(float(values[i]) + offset[i])
elif isinstance(param, (ParameterNumber, ParameterSelection)):
command += ' -' + param.name + ' ' + str(param.value)
else:
command += ' -' + param.name + ' "' + str(param.value) + '"'
for out in self.outputs:
if isinstance(out, OutputRaster):
filename = out.getCompatibleFileName(self)
filename += '.sgrd'
command += ' -' + out.name + ' "' + filename + '"'
if isinstance(out, OutputVector):
filename = out.getCompatibleFileName(self)
command += ' -' + out.name + ' "' + filename + '"'
if isinstance(out, OutputTable):
filename = out.getCompatibleFileName(self)
command += ' -' + out.name + ' "' + filename + '"'
commands.append(command)
# 3: Export resulting raster layers
optim = ProcessingConfig.getSetting(
SagaUtils.SAGA_IMPORT_EXPORT_OPTIMIZATION)
for out in self.outputs:
if isinstance(out, OutputRaster):
filename = out.getCompatibleFileName(self)
filename2 = filename + '.sgrd'
formatIndex = (4 if not saga208 and isWindows() else 1)
sessionExportedLayers[filename] = filename2
dontExport = True
# Do not export is the output is not a final output
# of the model
if self.model is not None and optim:
for subalg in self.model.algOutputs:
if out.name in subalg:
if subalg[out.name] is not None:
dontExport = False
break
if dontExport:
continue
if self.cmdname == 'RGB Composite':
if isWindows() or isMac() or not saga208:
commands.append('io_grid_image 0 -IS_RGB -GRID:"' + filename2
+ '" -FILE:"' + filename
+ '"')
else:
commands.append('libio_grid_image 0 -IS_RGB -GRID:"' + filename2
+ '" -FILE:"' + filename
+ '"')
else:
if isWindows() or isMac() or not saga208:
commands.append('io_gdal 1 -GRIDS "' + filename2
+ '" -FORMAT ' + str(formatIndex)
+ ' -TYPE 0 -FILE "' + filename + '"')
else:
commands.append('libio_gdal 1 -GRIDS "' + filename2
+ '" -FORMAT 1 -TYPE 0 -FILE "' + filename
+ '"')
# 4: Run SAGA
commands = self.editCommands(commands)
SagaUtils.createSagaBatchJobFileFromSagaCommands(commands)
loglines = []
loglines.append('SAGA execution commands')
for line in commands:
progress.setCommand(line)
loglines.append(line)
if ProcessingConfig.getSetting(SagaUtils.SAGA_LOG_COMMANDS):
ProcessingLog.addToLog(ProcessingLog.LOG_INFO, loglines)
SagaUtils.executeSaga(progress)
def preProcessInputs(self):
name = self.commandLineName().replace('.', '_')[len('saga:'):]
try:
module = importlib.import_module('processing.saga.ext.' + name)
except ImportError:
return
if hasattr(module, 'preProcessInputs'):
func = getattr(module, 'preProcessInputs')
func(self)
def editCommands(self, commands):
name = self.commandLineName()[len('saga:'):]
try:
module = importlib.import_module('processing.saga.ext.' + name)
except ImportError:
return commands
if hasattr(module, 'editCommands'):
func = getattr(module, 'editCommands')
return func(commands)
else:
return commands
def getOutputCellsize(self):
"""Tries to guess the cellsize of the output, searching for
a parameter with an appropriate name for it.
"""
cellsize = 0
for param in self.parameters:
if param.value is not None and param.name == 'USER_SIZE':
cellsize = float(param.value)
break
return cellsize
def resampleRasterLayer(self, layer):
"""This is supposed to be run after having exported all raster
layers.
"""
if layer in self.exportedLayers.keys():
inputFilename = self.exportedLayers[layer]
else:
inputFilename = layer
destFilename = getTempFilename('sgrd')
self.exportedLayers[layer] = destFilename
saga208 = ProcessingConfig.getSetting(SagaUtils.SAGA_208)
if isWindows() or isMac() or not saga208:
s = 'grid_tools "Resampling" -INPUT "' + inputFilename \
+ '" -TARGET 0 -SCALE_UP_METHOD 4 -SCALE_DOWN_METHOD 4 -USER_XMIN ' \
+ str(self.xmin) + ' -USER_XMAX ' + str(self.xmax) \
+ ' -USER_YMIN ' + str(self.ymin) + ' -USER_YMAX ' \
+ str(self.ymax) + ' -USER_SIZE ' + str(self.cellsize) \
+ ' -USER_GRID "' + destFilename + '"'
else:
s = 'libgrid_tools "Resampling" -INPUT "' + inputFilename \
+ '" -TARGET 0 -SCALE_UP_METHOD 4 -SCALE_DOWN_METHOD 4 -USER_XMIN ' \
+ str(self.xmin) + ' -USER_XMAX ' + str(self.xmax) \
+ ' -USER_YMIN ' + str(self.ymin) + ' -USER_YMAX ' \
+ str(self.ymax) + ' -USER_SIZE ' + str(self.cellsize) \
+ ' -USER_GRID "' + destFilename + '"'
return s
def exportRasterLayer(self, source):
if source in sessionExportedLayers:
self.exportedLayers[source] = sessionExportedLayers[source]
return None
layer = dataobjects.getObjectFromUri(source, False)
if layer:
filename = str(layer.name())
else:
filename = os.path.basename(source)
validChars = \
'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789:'
filename = ''.join(c for c in filename if c in validChars)
if len(filename) == 0:
filename = 'layer'
destFilename = getTempFilenameInTempFolder(filename + '.sgrd')
self.exportedLayers[source] = destFilename
sessionExportedLayers[source] = destFilename
saga208 = ProcessingConfig.getSetting(SagaUtils.SAGA_208)
if isWindows() or isMac() or not saga208:
return 'io_gdal 0 -TRANSFORM -INTERPOL 0 -GRIDS "' + destFilename + '" -FILES "' + source \
+ '"'
else:
return 'libio_gdal 0 -GRIDS "' + destFilename + '" -FILES "' \
+ source + '"'
def checkBeforeOpeningParametersDialog(self):
msg = SagaUtils.checkSagaIsInstalled()
if msg is not None:
html = 'This algorithm requires SAGA to be run.Unfortunately, \
it seems that SAGA is not installed in your system, or it \
is not correctly configured to be used from QGIS
'
html += 'Click here to know more about how to install and configure SAGA to be used with QGIS
'
return html
def checkParameterValuesBeforeExecuting(self):
"""We check that there are no multiband layers, which are not
supported by SAGA.
"""
for param in self.parameters:
if isinstance(param, ParameterRaster):
value = param.value
layer = dataobjects.getObjectFromUri(value)
if layer is not None and layer.bandCount() > 1:
return 'Input layer ' + str(layer.name()) \
+ ' has more than one band.\n' \
+ 'Multiband layers are not supported by SAGA'
def helpFile(self):
return os.path.join(os.path.dirname(__file__), 'help',
self.name.replace(' ', '') + '.html')
def getPostProcessingErrorMessage(self, wrongLayers):
html = GeoAlgorithm.getPostProcessingErrorMessage(self, wrongLayers)
msg = SagaUtils.checkSagaIsInstalled(True)
html += 'This algorithm requires SAGA to be run. A test to check \
if SAGA is correctly installed and configured in your system \
has been performed, with the following result:
'
if msg is None:
html += 'SAGA seems to be correctly installed and \
configured
'
else:
html += msg + ''
html += 'Click here to know more about how to install and configure SAGA to be used with QGIS
'
return html