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Since it's safe to evaluate parameters in background threads now, it's usually going to be ok to evaluate everything in the processAlgorithm step. This keeps the algorithm code as simple as possible, and will make porting faster. Note that the prepare/postProcess virtual methods still exist and can be used when an algorithm MUST do setup/cleanup work in the main thread.
160 lines
6.3 KiB
Python
160 lines
6.3 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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QgsFeatureSink,
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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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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterFeatureSink,
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QgsProcessingOutputVectorLayer,
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QgsSpatialIndex)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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from processing.tools import vector
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class SymmetricalDifference(QgisAlgorithm):
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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 __init__(self):
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super().__init__()
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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
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self.tr('Input layer')))
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self.addParameter(QgsProcessingParameterFeatureSource(self.OVERLAY,
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self.tr('Difference layer')))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Symmetrical difference')))
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self.addOutput(QgsProcessingOutputVectorLayer(self.OUTPUT, self.tr('Symmetrical difference')))
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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 processAlgorithm(self, parameters, context, feedback):
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sourceA = self.parameterAsSource(parameters, self.INPUT, context)
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sourceB = self.parameterAsSource(parameters, self.OVERLAY, context)
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geomType = QgsWkbTypes.multiType(sourceA.wkbType())
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fields = vector.combineFields(sourceA.fields(), sourceB.fields())
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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fields, geomType, sourceA.sourceCrs())
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featB = QgsFeature()
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outFeat = QgsFeature()
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indexA = QgsSpatialIndex(sourceA)
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indexB = QgsSpatialIndex(sourceB.getFeatures(QgsFeatureRequest().setSubsetOfAttributes([]).setDestinationCrs(sourceA.sourceCrs())))
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total = 100.0 / (sourceA.featureCount() * sourceB.featureCount()) if sourceA.featureCount() and sourceB.featureCount() else 1
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count = 0
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for featA in sourceA.getFeatures():
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if feedback.isCanceled():
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break
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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 = indexB.intersects(geom.boundingBox())
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request = QgsFeatureRequest().setFilterFids(intersects).setSubsetOfAttributes([])
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request.setDestinationCrs(sourceA.sourceCrs())
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for featB in sourceB.getFeatures(request):
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if feedback.isCanceled():
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break
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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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sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
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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(sourceA.fields())
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for featA in sourceB.getFeatures(QgsFeatureRequest().setDestinationCrs(sourceA.sourceCrs())):
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if feedback.isCanceled():
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break
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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 = indexA.intersects(geom.boundingBox())
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request = QgsFeatureRequest().setFilterFids(intersects).setSubsetOfAttributes([])
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for featB in sourceA.getFeatures(request):
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if feedback.isCanceled():
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break
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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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sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
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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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return {self.OUTPUT: dest_id}
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