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214 lines
9.1 KiB
Python
214 lines
9.1 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Union.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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from sextante.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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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 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 FToolsUtils as utils
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from sextante.core.SextanteLog import SextanteLog
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from sextante.core.GeoAlgorithm import GeoAlgorithm
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class Union(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/union.png")
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#===========================================================================
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def processAlgorithm(self, progress):
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vlayerA = QGisLayers.getObjectFromUri(self.getParameterValue(Union.INPUT))
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vlayerB = QGisLayers.getObjectFromUri(self.getParameterValue(Union.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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fields = utils.combineVectorFields(vlayerA, vlayerB )
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names = [field.name() for field in fields]
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SextanteLog.addToLog(SextanteLog.LOG_INFO, str(names))
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writer = self.getOutputFromName(Union.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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indexA = utils.createSpatialIndex(vlayerB)
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indexB = utils.createSpatialIndex(vlayerA)
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count = 0
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nElement = 0
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featuresA = QGisLayers.features(vlayerA)
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nFeat = len(featuresA)
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for inFeatA in featuresA:
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progress.setPercentage(nElement/float(nFeat) * 50)
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nElement += 1
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found = False
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geom = QgsGeometry( inFeatA.geometry() )
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diff_geom = QgsGeometry( geom )
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atMapA = inFeatA.attributes()
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intersects = indexA.intersects( geom.boundingBox() )
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if len( intersects ) < 1:
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try:
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outFeat.setGeometry( geom )
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outFeat.setAttributes( atMapA )
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writer.addFeature( outFeat )
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except:
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# this really shouldn't happen, as we
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# haven't edited the input geom at all
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raise GeoAlgorithmExecutionException("Feature exception while computing union")
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else:
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for id in intersects:
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count += 1
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request = QgsFeatureRequest().setFilterFid(id)
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inFeatB = vlayerB.getFeatures(request).next()
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atMapB = inFeatB.attributes()
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tmpGeom = QgsGeometry( inFeatB.geometry() )
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if geom.intersects( tmpGeom ):
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found = True
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int_geom = geom.intersection( tmpGeom )
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if int_geom is None:
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# There was a problem creating the intersection
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raise GeoAlgorithmExecutionException("Geometry exception while computing intersection")
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else:
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int_geom = QgsGeometry(int_geom)
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if diff_geom.intersects( tmpGeom ):
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diff_geom = diff_geom.difference( tmpGeom )
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if diff_geom is None:
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# It's possible there was an error here?
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diff_geom = QgsGeometry()
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else:
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diff_geom = QgsGeometry(diff_geom)
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if int_geom.wkbType() == 0:
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# intersection produced different geomety types
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temp_list = int_geom.asGeometryCollection()
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for i in temp_list:
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if i.type() == geom.type():
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int_geom = QgsGeometry( i )
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try:
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outFeat.setGeometry( int_geom )
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attrs = []
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attrs.extend(atMapA)
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attrs.extend(atMapB)
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outFeat.setAttributes(attrs)
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writer.addFeature( outFeat )
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except Exception, err:
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raise GeoAlgorithmExecutionException("Feature exception while computing union")
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else:
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# this only happends if the bounding box
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# intersects, but the geometry doesn't
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try:
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outFeat.setGeometry( geom )
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outFeat.setAttributes( atMapA )
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writer.addFeature( outFeat )
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except:
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# also shoudn't ever happen
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raise GeoAlgorithmExecutionException("Feature exception while computing union")
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if found:
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try:
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if diff_geom.wkbType() == 0:
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temp_list = diff_geom.asGeometryCollection()
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for i in temp_list:
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if i.type() == geom.type():
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diff_geom = QgsGeometry( i )
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outFeat.setGeometry( diff_geom )
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outFeat.setAttributes( atMapA )
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writer.addFeature( outFeat )
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except Exception, err:
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raise GeoAlgorithmExecutionException("Feature exception while computing union")
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length = len(vproviderA.fields())
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featuresA = QGisLayers.features(vlayerB)
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nFeat = len(featuresA)
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for inFeatA in featuresA:
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progress.setPercentage(nElement/float(nFeat) * 100)
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add = False
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geom = QgsGeometry( inFeatA.geometry() )
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diff_geom = QgsGeometry( geom )
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atMap = [None] * length
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atMap.extend(inFeatA.attributes())
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intersects = indexB.intersects( geom.boundingBox() )
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if len(intersects) < 1:
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try:
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outFeat.setGeometry(geom)
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outFeat.setAttributes(atMap)
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writer.addFeature(outFeat)
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except Exception, err:
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raise GeoAlgorithmExecutionException("Feature exception while computing union")
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else:
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for id in intersects:
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request = QgsFeatureRequest().setFilterFid(id)
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inFeatB = vlayerA.getFeatures(request).next()
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atMapB = inFeatB.attributes()
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tmpGeom = QgsGeometry( inFeatB.geometry() )
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try:
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if diff_geom.intersects( tmpGeom ):
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add = True
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diff_geom = QgsGeometry( diff_geom.difference( tmpGeom ) )
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else:
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# this only happends if the bounding box
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# intersects, but the geometry doesn't
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outFeat.setGeometry( diff_geom )
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outFeat.setAttributes( atMap )
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writer.addFeature( outFeat )
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except Exception, err:
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raise GeoAlgorithmExecutionException("Geometry exception while computing intersection")
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if add:
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try:
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outFeat.setGeometry( diff_geom )
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outFeat.setAttributes(atMap)
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writer.addFeature( outFeat )
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except Exception, err:
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raise err
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FEATURE_EXCEPT = False
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nElement += 1
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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 interesection")
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def defineCharacteristics(self):
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self.name = "Union"
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self.group = "Vector overlay tools"
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self.addParameter(ParameterVector(Union.INPUT, "Input layer", ParameterVector.VECTOR_TYPE_ANY))
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self.addParameter(ParameterVector(Union.INPUT2, "Input layer 2", ParameterVector.VECTOR_TYPE_ANY))
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self.addOutput(OutputVector(Union.OUTPUT, "Union"))
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