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136 lines
5.7 KiB
Python
136 lines
5.7 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Clip.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.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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class Clip(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/clip.png")
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#===========================================================================
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def processAlgorithm(self, progress):
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settings = QSettings()
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systemEncoding = settings.value( "/UI/encoding", "System" ).toString()
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output = self.getOutputValue(Clip.OUTPUT)
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vlayerA = QGisLayers.getObjectFromUri(self.getParameterValue(Clip.INPUT))
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vlayerB = QGisLayers.getObjectFromUri(self.getParameterValue(Clip.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 crsA != crsB:
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SextanteLog.addToLog(SextanteLog.LOG_WARNING, "Intersection. Non-matching CRSs. Results might be unexpected")
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fields = vproviderA.fields()
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writer = QgsVectorFileWriter( output, systemEncoding,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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vproviderA.rewind()
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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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int_geom = QgsGeometry( geom )
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atMap = inFeatA.attributeMap()
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intersects = index.intersects( geom.boundingBox() )
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found = False
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first = True
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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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if tmpGeom.intersects( geom ):
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found = True
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if first:
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outFeat.setGeometry( QgsGeometry( tmpGeom ) )
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first = False
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else:
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try:
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cur_geom = QgsGeometry( outFeat.geometry() )
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new_geom = QgsGeometry( cur_geom.combine( tmpGeom ) )
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outFeat.setGeometry( QgsGeometry( new_geom ) )
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except:
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GEOS_EXCEPT = False
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break
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if found:
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try:
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cur_geom = QgsGeometry( outFeat.geometry() )
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new_geom = QgsGeometry( geom.intersection( cur_geom ) )
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if new_geom.wkbType() == 7:
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int_com = QgsGeometry( geom.combine( cur_geom ) )
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int_sym = QgsGeometry( geom.symDifference( cur_geom ) )
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new_geom = QgsGeometry( int_com.difference( int_sym ) )
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try:
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outFeat.setGeometry( new_geom )
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outFeat.setAttributeMap( atMap )
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writer.addFeature( outFeat )
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except:
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FEAT_EXCEPT = False
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continue
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except:
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GEOS_EXCEPT = False
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continue
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if not GEOS_EXCEPT:
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SextanteLog.addToLog(SextanteLog.LOG_WARNING, "Geometry exception while computing clip")
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if not FEATURE_EXCEPT:
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SextanteLog.addToLog(SextanteLog.LOG_WARNING, "Feature exception while computing clip")
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def defineCharacteristics(self):
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self.name = "Clip"
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self.group = "Vector overlay tools"
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self.addParameter(ParameterVector(Clip.INPUT, "Input layer", ParameterVector.VECTOR_TYPE_ANY))
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self.addParameter(ParameterVector(Clip.INPUT2, "Clip layer", ParameterVector.VECTOR_TYPE_ANY))
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self.addOutput(OutputVector(Clip.OUTPUT, "Clipped"))
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