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207 lines
9.0 KiB
Python
207 lines
9.0 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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__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 qgis.core import QgsFeatureRequest, QgsFeature, QgsGeometry
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.ProcessingLog import ProcessingLog
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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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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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def processAlgorithm(self, progress):
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vlayerA = dataobjects.getObjectFromUri(self.getParameterValue(Union.INPUT))
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vlayerB = dataobjects.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 = vector.combineVectorFields(vlayerA, vlayerB)
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names = [field.name() for field in fields]
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ProcessingLog.addToLog(ProcessingLog.LOG_INFO, str(names))
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writer = self.getOutputFromName(Union.OUTPUT).getVectorWriter(fields,
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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 = vector.spatialindex(vlayerB)
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indexB = vector.spatialindex(vlayerA)
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count = 0
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nElement = 0
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featuresA = vector.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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lstIntersectingB = []
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geom = QgsGeometry(inFeatA.geometry())
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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 haven't
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# edited the input geom at all
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raise GeoAlgorithmExecutionException(
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self.tr('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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int_geom = geom.intersection(tmpGeom)
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lstIntersectingB.append(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(
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self.tr('Geometry exception while computing '
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'intersection'))
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else:
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int_geom = QgsGeometry(int_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(
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self.tr('Feature exception while computing union'))
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try:
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# the remaining bit of inFeatA's geometry
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# if there is nothing left, this will just silently fail and we're good
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diff_geom = QgsGeometry( geom )
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if len(lstIntersectingB) != 0:
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intB = QgsGeometry.unaryUnion(lstIntersectingB)
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diff_geom = diff_geom.difference(intB)
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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(
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self.tr('Feature exception while computing union'))
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length = len(vproviderA.fields())
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featuresA = vector.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(
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self.tr('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(
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diff_geom.difference(tmpGeom))
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else:
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# Ihis 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(
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self.tr('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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ProcessingLog.addToLog(ProcessingLog.LOG_WARNING,
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self.tr('Geometry exception while computing intersection'))
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if not FEATURE_EXCEPT:
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ProcessingLog.addToLog(ProcessingLog.LOG_WARNING,
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self.tr('Feature exception while computing intersection'))
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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,
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self.tr('Input layer'), [ParameterVector.VECTOR_TYPE_ANY]))
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self.addParameter(ParameterVector(Union.INPUT2,
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self.tr('Input layer 2'), [ParameterVector.VECTOR_TYPE_ANY]))
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self.addOutput(OutputVector(Union.OUTPUT, self.tr('Union')))
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