# -*- coding: utf-8 -*- """ *************************************************************************** Union.py --------------------- Date : August 2012 Copyright : (C) 2012 by Victor Olaya Email : volayaf at gmail dot com *************************************************************************** * * * This program is free software; you can redistribute it and/or modify * * it under the terms of the GNU General Public License as published by * * the Free Software Foundation; either version 2 of the License, or * * (at your option) any later version. * * * *************************************************************************** """ __author__ = 'Victor Olaya' __date__ = 'August 2012' __copyright__ = '(C) 2012, Victor Olaya' # This will get replaced with a git SHA1 when you do a git archive __revision__ = '$Format:%H$' from qgis.core import QgsFeatureRequest, QgsFeature, QgsGeometry from processing.core.GeoAlgorithm import GeoAlgorithm from processing.core.ProcessingLog import ProcessingLog from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException from processing.core.parameters import ParameterVector from processing.core.outputs import OutputVector from processing.tools import dataobjects, vector class Union(GeoAlgorithm): INPUT = 'INPUT' INPUT2 = 'INPUT2' OUTPUT = 'OUTPUT' def processAlgorithm(self, progress): vlayerA = dataobjects.getObjectFromUri(self.getParameterValue(Union.INPUT)) vlayerB = dataobjects.getObjectFromUri(self.getParameterValue(Union.INPUT2)) GEOS_EXCEPT = True FEATURE_EXCEPT = True vproviderA = vlayerA.dataProvider() fields = vector.combineVectorFields(vlayerA, vlayerB) names = [field.name() for field in fields] ProcessingLog.addToLog(ProcessingLog.LOG_INFO, unicode(names)) writer = self.getOutputFromName(Union.OUTPUT).getVectorWriter(fields, vproviderA.geometryType(), vproviderA.crs()) inFeatA = QgsFeature() inFeatB = QgsFeature() outFeat = QgsFeature() indexA = vector.spatialindex(vlayerB) indexB = vector.spatialindex(vlayerA) count = 0 nElement = 0 featuresA = vector.features(vlayerA) nFeat = len(featuresA) for inFeatA in featuresA: progress.setPercentage(nElement / float(nFeat) * 50) nElement += 1 lstIntersectingB = [] geom = QgsGeometry(inFeatA.geometry()) atMapA = inFeatA.attributes() intersects = indexA.intersects(geom.boundingBox()) if len(intersects) < 1: try: outFeat.setGeometry(geom) outFeat.setAttributes(atMapA) writer.addFeature(outFeat) except: # This really shouldn't happen, as we haven't # edited the input geom at all raise GeoAlgorithmExecutionException( self.tr('Feature exception while computing union')) else: for id in intersects: count += 1 request = QgsFeatureRequest().setFilterFid(id) inFeatB = vlayerB.getFeatures(request).next() atMapB = inFeatB.attributes() tmpGeom = QgsGeometry(inFeatB.geometry()) if geom.intersects(tmpGeom): int_geom = geom.intersection(tmpGeom) lstIntersectingB.append(tmpGeom) if int_geom is None: # There was a problem creating the intersection raise GeoAlgorithmExecutionException( self.tr('Geometry exception while computing ' 'intersection')) else: int_geom = QgsGeometry(int_geom) if int_geom.wkbType() == 0: # Intersection produced different geomety types temp_list = int_geom.asGeometryCollection() for i in temp_list: if i.type() == geom.type(): int_geom = QgsGeometry(i) try: outFeat.setGeometry(int_geom) attrs = [] attrs.extend(atMapA) attrs.extend(atMapB) outFeat.setAttributes(attrs) writer.addFeature(outFeat) except Exception as err: raise GeoAlgorithmExecutionException( self.tr('Feature exception while computing union')) try: # the remaining bit of inFeatA's geometry # if there is nothing left, this will just silently fail and we're good diff_geom = QgsGeometry(geom) if len(lstIntersectingB) != 0: intB = QgsGeometry.unaryUnion(lstIntersectingB) diff_geom = diff_geom.difference(intB) if diff_geom.wkbType() == 0: temp_list = diff_geom.asGeometryCollection() for i in temp_list: if i.type() == geom.type(): diff_geom = QgsGeometry(i) outFeat.setGeometry(diff_geom) outFeat.setAttributes(atMapA) writer.addFeature(outFeat) except Exception as err: raise GeoAlgorithmExecutionException( self.tr('Feature exception while computing union')) length = len(vproviderA.fields()) featuresA = vector.features(vlayerB) nFeat = len(featuresA) for inFeatA in featuresA: progress.setPercentage(nElement / float(nFeat) * 100) add = False geom = QgsGeometry(inFeatA.geometry()) diff_geom = QgsGeometry(geom) atMap = [None] * length atMap.extend(inFeatA.attributes()) intersects = indexB.intersects(geom.boundingBox()) if len(intersects) < 1: try: outFeat.setGeometry(geom) outFeat.setAttributes(atMap) writer.addFeature(outFeat) except Exception as err: raise GeoAlgorithmExecutionException( self.tr('Feature exception while computing union')) else: for id in intersects: request = QgsFeatureRequest().setFilterFid(id) inFeatB = vlayerA.getFeatures(request).next() atMapB = inFeatB.attributes() tmpGeom = QgsGeometry(inFeatB.geometry()) try: if diff_geom.intersects(tmpGeom): add = True diff_geom = QgsGeometry( diff_geom.difference(tmpGeom)) else: # Ihis only happends if the bounding box # intersects, but the geometry doesn't outFeat.setGeometry(diff_geom) outFeat.setAttributes(atMap) writer.addFeature(outFeat) except Exception as err: raise GeoAlgorithmExecutionException( self.tr('Geometry exception while computing intersection')) if add: try: outFeat.setGeometry(diff_geom) outFeat.setAttributes(atMap) writer.addFeature(outFeat) except Exception as err: raise err FEATURE_EXCEPT = False nElement += 1 del writer if not GEOS_EXCEPT: ProcessingLog.addToLog(ProcessingLog.LOG_WARNING, self.tr('Geometry exception while computing intersection')) if not FEATURE_EXCEPT: ProcessingLog.addToLog(ProcessingLog.LOG_WARNING, self.tr('Feature exception while computing intersection')) def defineCharacteristics(self): self.name, self.i18n_name = self.trAlgorithm('Union') self.group, self.i18n_group = self.trAlgorithm('Vector overlay tools') self.addParameter(ParameterVector(Union.INPUT, self.tr('Input layer'), [ParameterVector.VECTOR_TYPE_ANY])) self.addParameter(ParameterVector(Union.INPUT2, self.tr('Input layer 2'), [ParameterVector.VECTOR_TYPE_ANY])) self.addOutput(OutputVector(Union.OUTPUT, self.tr('Union')))