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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.
143 lines
5.5 KiB
Python
143 lines
5.5 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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SymmetricalDifference.py
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---------------------
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Date : September 2014
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Copyright : (C) 2014 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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__author__ = 'Alexander Bruy'
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__date__ = 'September 2014'
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__copyright__ = '(C) 2014, 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 qgis.core import (QgsFeature,
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QgsGeometry,
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QgsFeatureRequest,
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NULL,
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QgsWkbTypes,
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QgsMessageLog,
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QgsProcessingUtils)
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.parameters import ParameterVector
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects, vector
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class SymmetricalDifference(GeoAlgorithm):
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INPUT = 'INPUT'
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OVERLAY = 'OVERLAY'
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OUTPUT = 'OUTPUT'
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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'sym_difference.png'))
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def group(self):
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return self.tr('Vector overlay tools')
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def name(self):
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return 'symmetricaldifference'
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def displayName(self):
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return self.tr('Symmetrical difference')
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def defineCharacteristics(self):
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self.addParameter(ParameterVector(self.INPUT,
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self.tr('Input layer')))
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self.addParameter(ParameterVector(self.OVERLAY,
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self.tr('Difference layer')))
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self.addOutput(OutputVector(self.OUTPUT,
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self.tr('Symmetrical difference')))
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def processAlgorithm(self, context, feedback):
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layerA = dataobjects.QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT), context)
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layerB = dataobjects.QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.OVERLAY), context)
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geomType = QgsWkbTypes.multiType(layerA.wkbType())
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fields = vector.combineVectorFields(layerA, layerB)
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields, geomType, layerA.crs(), context)
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featB = QgsFeature()
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outFeat = QgsFeature()
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indexA = vector.spatialindex(layerB)
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indexB = vector.spatialindex(layerA)
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featuresA = QgsProcessingUtils.getFeatures(layerA, context)
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featuresB = QgsProcessingUtils.getFeatures(layerB, context)
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total = 100.0 / (QgsProcessingUtils.featureCount(layerA, context) * QgsProcessingUtils.featureCount(layerB, context))
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count = 0
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for featA in featuresA:
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geom = featA.geometry()
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diffGeom = QgsGeometry(geom)
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attrs = featA.attributes()
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intersects = indexA.intersects(geom.boundingBox())
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request = QgsFeatureRequest().setFilterFids(intersects).setSubsetOfAttributes([])
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for featB in layerB.getFeatures(request):
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tmpGeom = featB.geometry()
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if diffGeom.intersects(tmpGeom):
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diffGeom = QgsGeometry(diffGeom.difference(tmpGeom))
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try:
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outFeat.setGeometry(diffGeom)
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outFeat.setAttributes(attrs)
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writer.addFeature(outFeat)
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except:
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QgsMessageLog.logMessage(self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'),
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self.tr('Processing'), QgsMessageLog.WARNING)
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continue
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count += 1
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feedback.setProgress(int(count * total))
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length = len(layerA.fields())
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for featA in featuresB:
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geom = featA.geometry()
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diffGeom = QgsGeometry(geom)
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attrs = featA.attributes()
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attrs = [NULL] * length + attrs
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intersects = indexB.intersects(geom.boundingBox())
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request = QgsFeatureRequest().setFilterFids(intersects).setSubsetOfAttributes([])
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for featB in layerA.getFeatures(request):
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tmpGeom = featB.geometry()
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if diffGeom.intersects(tmpGeom):
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diffGeom = QgsGeometry(diffGeom.difference(tmpGeom))
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try:
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outFeat.setGeometry(diffGeom)
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outFeat.setAttributes(attrs)
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writer.addFeature(outFeat)
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except:
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QgsMessageLog.logMessage(self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'),
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self.tr('Processing'), QgsMessageLog.WARNING)
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continue
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count += 1
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feedback.setProgress(int(count * total))
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del writer
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