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Algorithms and other processing code should use this method (instead of dataobjects.getLayerFromString) to retrieve layers from a string, as it considers the processing context and allows resolving strings to temporarily stored layers. This permits processing models to function correctly when intermediate results are stored as memory layers. Subsequent model algorithms can then access these temporary layers as inputs. All temporary layers will be removed when the context object is destroyed after the model algorithm is run.
195 lines
7.3 KiB
Python
195 lines
7.3 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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nviz7.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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from future import standard_library
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standard_library.install_aliases()
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from builtins import str
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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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from qgis.PyQt.QtGui import QIcon
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from qgis.core import (QgsProcessingAlgorithm,
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QgsRasterLayer)
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.parameters import ParameterMultipleInput
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from processing.core.parameters import ParameterExtent
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from processing.core.parameters import ParameterNumber
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from processing.core.parameters import ParameterRaster
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from .Grass7Utils import Grass7Utils
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from processing.tools.system import getNumExportedLayers
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from processing.tools import dataobjects
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pluginPath = os.path.normpath(os.path.join(
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os.path.split(os.path.dirname(__file__))[0], os.pardir))
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class nviz7(GeoAlgorithm):
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ELEVATION = 'ELEVATION'
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VECTOR = 'VECTOR'
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COLOR = 'COLOR'
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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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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'grass.png'))
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def flags(self):
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return QgsProcessingAlgorithm.FlagHideFromModeler
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def name(self):
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return 'nviz7'
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def displayName(self):
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return self.tr('nviz7')
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def group(self):
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return self.tr('Visualization(NVIZ)')
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def defineCharacteristics(self):
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self.addParameter(ParameterMultipleInput(
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nviz7.ELEVATION,
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self.tr('Raster file(s) for elevation'),
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dataobjects.TYPE_RASTER, True))
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self.addParameter(ParameterMultipleInput(
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nviz7.VECTOR,
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self.tr('Vector lines/areas overlay file(s)'),
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dataobjects.TYPE_VECTOR_ANY, True))
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self.addParameter(ParameterMultipleInput(
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nviz7.COLOR,
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self.tr('Raster file(s) for color'),
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dataobjects.TYPE_RASTER, True))
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self.addParameter(ParameterExtent(
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nviz7.GRASS_REGION_EXTENT_PARAMETER,
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self.tr('GRASS region extent')))
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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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def processAlgorithm(self, context, feedback):
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commands = []
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vector = self.getParameterValue(self.VECTOR)
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elevation = self.getParameterValue(self.ELEVATION)
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color = self.getParameterValue(self.COLOR)
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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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commands.append(command)
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command = 'nviz7'
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if vector:
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layers = vector.split(';')
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for layer in layers:
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(cmd, newfilename) = self.exportVectorLayer(layer)
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commands.append(cmd)
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vector = vector.replace(layer, newfilename)
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command += ' vector=' + vector.replace(';', ',')
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if color:
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layers = color.split(';')
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for layer in layers:
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(cmd, newfilename) = self.exportRasterLayer(layer)
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commands.append(cmd)
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color = color.replace(layer, newfilename)
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command += ' color=' + color.replace(';', ',')
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if elevation:
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layers = elevation.split(';')
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for layer in layers:
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(cmd, newfilename) = self.exportRasterLayer(layer)
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commands.append(cmd)
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elevation = elevation.replace(layer, newfilename)
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command += ' elevation=' + elevation.replace(';', ',')
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if elevation is None and vector is None:
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command += ' -q'
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commands.append(command)
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Grass7Utils.createTempMapset()
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Grass7Utils.executeGrass7(commands, feedback)
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def getTempFilename(self):
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filename = 'tmp' + str(time.time()).replace('.', '') \
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+ str(getNumExportedLayers())
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return filename
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def exportVectorLayer(self, layer):
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destFilename = self.getTempFilename()
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command = 'v.in.ogr'
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command += ' min_area=-1'
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command += ' input="' + os.path.dirname(layer) + '"'
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command += ' layer=' + os.path.basename(layer)[:-4]
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command += ' output=' + destFilename
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command += ' --overwrite -o'
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return (command, destFilename)
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def exportRasterLayer(self, layer):
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destFilename = self.getTempFilename()
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command = 'r.in.gdal'
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command += ' input="' + layer + '"'
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command += ' band=1'
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command += ' out=' + destFilename
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command += ' --overwrite -o'
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return (command, destFilename)
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def getDefaultCellsize(self):
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cellsize = 0
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context = dataobjects.createContext()
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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.QgsProcessingUtils.mapLayerFromString(param.value, context)
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cellsize = max(cellsize, (layer.extent().xMaximum() -
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layer.extent().xMinimum()) /
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layer.width())
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elif isinstance(param, ParameterMultipleInput):
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layers = param.value.split(';')
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for layername in layers:
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layer = dataobjects.QgsProcessingUtils.mapLayerFromString(layername, context)
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if isinstance(layer, QgsRasterLayer):
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cellsize = max(cellsize, (
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layer.extent().xMaximum() -
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layer.extent().xMinimum()) /
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layer.width())
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if cellsize == 0:
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cellsize = 1
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return cellsize
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