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150 lines
5.4 KiB
Python
150 lines
5.4 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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SymetricalDifference.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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from PyQt4.QtCore import *
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from qgis.core import *
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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.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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class SymetricalDifference(GeoAlgorithm):
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INPUT = 'INPUT'
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OVERLAY = 'OVERLAY'
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OUTPUT = 'OUTPUT'
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def defineCharacteristics(self):
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self.name = 'Symetrical difference'
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self.group = 'Vector overlay tools'
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self.addParameter(ParameterVector(self.INPUT, 'Input layer',
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[ParameterVector.VECTOR_TYPE_ANY]))
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self.addParameter(ParameterVector(self.OVERLAY,
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'Difference layer',
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[ParameterVector.VECTOR_TYPE_ANY]))
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self.addOutput(OutputVector(self.OUTPUT, 'Symetrical 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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providerA = layerA.dataProvider()
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providerB = layerB.dataProvider()
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GEOS_EXCEPT = True
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FEATURE_EXCEPT = True
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fields = vector.combineVectorFields(layerA, layerB)
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
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fields, providerA.geometryType(), providerA.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 = QgsGeometry(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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for i in intersects:
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providerB.getFeatures(QgsFeatureRequest().setFilterFid(i)).nextFeature(featB)
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tmpGeom = QgsGeometry(featB.geometry())
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try:
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if diffGeom.intersects(tmpGeom):
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diffGeom = QgsGeometry(diffGeom.difference(tmpGeom))
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except:
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add = False
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GEOS_EXCEPT = 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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FEATURE_EXCEPT = False
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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(providerA.fields())
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for featA in featuresB:
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add = True
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geom = QgsGeometry(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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for i in intersects:
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providerA.getFeatures(QgsFeatureRequest().setFilterFid(i)).nextFeature(featB)
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tmpGeom = QgsGeometry(featB.geometry())
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try:
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if diffGeom.intersects(tmpGeom):
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diffGeom = QgsGeometry(diffGeom.difference(tmpGeom))
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except:
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add = False
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GEOS_EXCEPT = 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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FEATURE_EXCEPT = False
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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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if not GEOS_EXCEPT:
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ProcessingLog.addToLog(
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ProcessingLog.LOG_WARNING,
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'Geometry exception while computing symetrical difference')
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if not FEATURE_EXCEPT:
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ProcessingLog.addToLog(
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ProcessingLog.LOG_WARNING,
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'Feature exception while computing symetrical difference')
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