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119 lines
5.6 KiB
Python
119 lines
5.6 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Intersection.py
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---------------------
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Date : August 2012
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Copyright : (C) 2012 by Victor Olaya
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Email : volayaf 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__ = 'Victor Olaya'
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__date__ = 'August 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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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 sextante.core.GeoAlgorithm import GeoAlgorithm
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from PyQt4.QtCore import *
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from PyQt4.QtGui import *
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from qgis.core import *
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from sextante.parameters.ParameterVector import ParameterVector
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from sextante.core.QGisLayers import QGisLayers
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from sextante.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from sextante.outputs.OutputVector import OutputVector
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from sextante.algs.ftools import ftools_utils
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from sextante.core.SextanteLog import SextanteLog
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from sextante.core.SextanteConfig import SextanteConfig
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class Intersection(GeoAlgorithm):
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INPUT = "INPUT"
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INPUT2 = "INPUT2"
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OUTPUT = "OUTPUT"
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#===========================================================================
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# def getIcon(self):
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# return QtGui.QIcon(os.path.dirname(__file__) + "/icons/intersect.png")
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#===========================================================================
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def processAlgorithm(self, progress):
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vlayerA = QGisLayers.getObjectFromUri(self.getParameterValue(Intersection.INPUT))
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vlayerB = QGisLayers.getObjectFromUri(self.getParameterValue(Intersection.INPUT2))
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GEOS_EXCEPT = True
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FEATURE_EXCEPT = True
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vproviderA = vlayerA.dataProvider()
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allAttrsA = vproviderA.attributeIndexes()
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vproviderA.select( allAttrsA )
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vproviderB = vlayerB.dataProvider()
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allAttrsB = vproviderB.attributeIndexes()
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vproviderB.select(allAttrsB )
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# check for crs compatibility
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crsA = vproviderA.crs()
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crsB = vproviderB.crs()
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if not crsA.isValid() or not crsB.isValid():
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SextanteLog.addToLog(SextanteLog.LOG_WARNING, "Intersection. Invalid CRS. Results might be unexpected")
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else:
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if not crsA != crsB:
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SextanteLog.addToLog(SextanteLog.LOG_WARNING, "Intersection. Non-matching CRSs. Results might be unexpected")
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fields = ftools_utils.combineVectorFields(vlayerA, vlayerB)
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longNames = ftools_utils.checkFieldNameLength( fields )
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if not longNames.isEmpty():
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raise GeoAlgorithmExecutionException("Following field names are longer than 10 characters:\n" + longNames.join('\n') )
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writer = self.getOutputFromName(Intersection.OUTPUT).getVectorWriter(fields, vproviderA.geometryType(), vproviderA.crs() )
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inFeatA = QgsFeature()
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inFeatB = QgsFeature()
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outFeat = QgsFeature()
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index = ftools_utils.createIndex(QGisLayers.features(vlayerB))
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nElement = 0
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selectionA = QGisLayers.features(vlayerA)
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nFeat = len(selectionA)
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for inFeatA in selectionA:
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nElement += 1
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progress.setPercentage(nElement/float(nFeat) * 100)
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geom = QgsGeometry( inFeatA.geometry() )
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atMapA = inFeatA.attributeMap()
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intersects = index.intersects( geom.boundingBox() )
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for id in intersects:
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vproviderB.featureAtId( int( id ), inFeatB , True, allAttrsB )
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tmpGeom = QgsGeometry( inFeatB.geometry() )
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try:
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if geom.intersects( tmpGeom ):
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atMapB = inFeatB.attributeMap()
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int_geom = QgsGeometry( geom.intersection( tmpGeom ) )
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if int_geom.wkbType() == 7:
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int_com = geom.combine( tmpGeom )
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int_sym = geom.symDifference( tmpGeom )
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int_geom = QgsGeometry( int_com.difference( int_sym ) )
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try:
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outFeat.setGeometry( int_geom )
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outFeat.setAttributeMap( atMapA.extend( atMapB ) )
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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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except:
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GEOS_EXCEPT = False
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break
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del writer
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if not GEOS_EXCEPT:
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SextanteLog.addToLog(SextanteLog.LOG_WARNING, "Geometry exception while computing intersection")
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if not FEATURE_EXCEPT:
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SextanteLog.addToLog(SextanteLog.LOG_WARNING, "Feature exception while computing intersection")
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def defineCharacteristics(self):
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self.name = "Intersection"
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self.group = "Vector overlay tools"
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self.addParameter(ParameterVector(Intersection.INPUT, "Input layer", ParameterVector.VECTOR_TYPE_ANY))
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self.addParameter(ParameterVector(Intersection.INPUT2, "Intersect layer", ParameterVector.VECTOR_TYPE_ANY))
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self.addOutput(OutputVector(Intersection.OUTPUT, "Intersection"))
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