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144 lines
5.6 KiB
Python
144 lines
5.6 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.algs.qgis.QgisAlgorithm import QgisAlgorithm
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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 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(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 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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layerA = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT), context)
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layerB = 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 = QgsProcessingUtils.createSpatialIndex(layerB, context)
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indexB = QgsProcessingUtils.createSpatialIndex(layerA, context)
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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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