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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.
92 lines
3.3 KiB
Python
92 lines
3.3 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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rasterize_over.py
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---------------------
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Date : September 2013
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Copyright : (C) 2013 by Alexander Bruy
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Email : alexander dot bruy 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 builtins import str
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__author__ = 'Alexander Bruy'
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__date__ = 'September 2013'
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__copyright__ = '(C) 2013, Alexander Bruy'
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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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from qgis.PyQt.QtGui import QIcon
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterRaster
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from processing.core.parameters import ParameterTableField
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from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
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from processing.algs.gdal.GdalUtils import GdalUtils
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from processing.tools import dataobjects
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from processing.tools.vector import ogrConnectionString, ogrLayerName
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class rasterize_over(GdalAlgorithm):
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INPUT = 'INPUT'
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INPUT_RASTER = 'INPUT_RASTER'
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FIELD = 'FIELD'
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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'gdaltools', 'rasterize.png'))
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def name(self):
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return 'rasterize_over'
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def displayName(self):
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return self.tr('Rasterize (write over existing raster)')
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def group(self):
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return self.tr('Vector conversion')
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def defineCharacteristics(self):
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self.addParameter(ParameterVector(self.INPUT, self.tr('Input layer')))
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self.addParameter(ParameterTableField(self.FIELD,
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self.tr('Attribute field'), self.INPUT))
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self.addParameter(ParameterRaster(self.INPUT_RASTER,
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self.tr('Existing raster layer'), False))
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def getConsoleCommands(self):
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context = dataobjects.createContext()
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inLayer = dataobjects.QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT), context)
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inRasterLayer = dataobjects.QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT_RASTER), context)
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ogrLayer = ogrConnectionString(inLayer)[1:-1]
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ogrRasterLayer = ogrConnectionString(inRasterLayer)[1:-1]
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arguments = []
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arguments.append('-a')
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arguments.append(str(self.getParameterValue(self.FIELD)))
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arguments.append('-l')
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arguments.append(ogrLayerName(inLayer))
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arguments.append(ogrLayer)
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arguments.append(ogrRasterLayer)
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return ['gdal_rasterize', GdalUtils.escapeAndJoin(arguments)]
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def commandName(self):
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return "gdal_rasterize"
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