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153 lines
6.3 KiB
Python
153 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 Qgis, QgsFeature, QgsGeometry, QgsFeatureRequest, NULL, QgsWkbTypes
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from processing.core.ProcessingLog import ProcessingLog
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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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 getIcon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'sym_difference.png'))
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Symmetrical difference')
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self.group, self.i18n_group = self.trAlgorithm('Vector overlay tools')
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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, progress):
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layerA = dataobjects.getObjectFromUri(
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self.getParameterValue(self.INPUT))
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layerB = dataobjects.getObjectFromUri(
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self.getParameterValue(self.OVERLAY))
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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(
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fields, geomType, layerA.crs())
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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 = vector.features(layerA)
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featuresB = vector.features(layerB)
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total = 100.0 / (len(featuresA) * len(featuresB))
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count = 0
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for featA in featuresA:
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add = True
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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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if not diffGeom.isGeosValid():
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ProcessingLog.addToLog(ProcessingLog.LOG_ERROR,
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self.tr('GEOS geoprocessing error: One or '
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'more input features have invalid '
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'geometry.'))
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add = False
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break
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if add:
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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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ProcessingLog.addToLog(ProcessingLog.LOG_WARNING,
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self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'))
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continue
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count += 1
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progress.setPercentage(int(count * total))
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length = len(layerA.fields())
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for featA in featuresB:
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add = True
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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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if not diffGeom.isGeosValid():
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ProcessingLog.addToLog(ProcessingLog.LOG_ERROR,
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self.tr('GEOS geoprocessing error: One or '
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'more input features have invalid '
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'geometry.'))
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add = False
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break
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if add:
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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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ProcessingLog.addToLog(ProcessingLog.LOG_WARNING,
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self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'))
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continue
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count += 1
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progress.setPercentage(int(count * total))
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del writer
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