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130 lines
6.0 KiB
Python
130 lines
6.0 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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import os
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from PyQt4.QtGui import QIcon
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from qgis.core import QGis, QgsFeatureRequest, QgsFeature, QgsGeometry, QgsWKBTypes
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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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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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wkbTypeGroups = {
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'Point': (QGis.WKBPoint, QGis.WKBMultiPoint, QGis.WKBPoint25D, QGis.WKBMultiPoint25D,),
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'LineString': (QGis.WKBLineString, QGis.WKBMultiLineString, QGis.WKBLineString25D, QGis.WKBMultiLineString25D,),
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'Polygon': (QGis.WKBPolygon, QGis.WKBMultiPolygon, QGis.WKBPolygon25D, QGis.WKBMultiPolygon25D,),
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}
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for key, value in wkbTypeGroups.items():
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for const in value:
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wkbTypeGroups[const] = key
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GEOM_25D = [QGis.WKBPoint25D, QGis.WKBLineString25D, QGis.WKBPolygon25D,
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QGis.WKBMultiPoint25D, QGis.WKBMultiLineString25D,
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QGis.WKBMultiPolygon25D]
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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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def getIcon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'intersect.png'))
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Intersection')
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self.group, self.i18n_group = self.trAlgorithm('Vector overlay tools')
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self.addParameter(ParameterVector(self.INPUT,
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self.tr('Input layer'), [ParameterVector.VECTOR_TYPE_ANY]))
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self.addParameter(ParameterVector(self.INPUT2,
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self.tr('Intersect layer'), [ParameterVector.VECTOR_TYPE_ANY]))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Intersection')))
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def processAlgorithm(self, progress):
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vlayerA = dataobjects.getObjectFromUri(
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self.getParameterValue(self.INPUT))
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vlayerB = dataobjects.getObjectFromUri(
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self.getParameterValue(self.INPUT2))
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vproviderA = vlayerA.dataProvider()
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geomType = vproviderA.geometryType()
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if geomType in GEOM_25D:
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raise GeoAlgorithmExecutionException(
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self.tr('Input layer has unsupported geometry type {}').format(geomType))
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fields = vector.combineVectorFields(vlayerA, vlayerB)
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields,
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geomType, vproviderA.crs())
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outFeat = QgsFeature()
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index = vector.spatialindex(vlayerB)
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selectionA = vector.features(vlayerA)
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total = 100.0 / len(selectionA)
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for current, inFeatA in enumerate(selectionA):
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progress.setPercentage(int(current * total))
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geom = QgsGeometry(inFeatA.geometry())
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atMapA = inFeatA.attributes()
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intersects = index.intersects(geom.boundingBox())
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for i in intersects:
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request = QgsFeatureRequest().setFilterFid(i)
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inFeatB = vlayerB.getFeatures(request).next()
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tmpGeom = QgsGeometry(inFeatB.geometry())
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if geom.intersects(tmpGeom):
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atMapB = inFeatB.attributes()
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int_geom = QgsGeometry(geom.intersection(tmpGeom))
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if int_geom.wkbType() == QGis.WKBUnknown or QgsWKBTypes.flatType(int_geom.geometry().wkbType()) == QgsWKBTypes.GeometryCollection:
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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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if int_geom.isGeosEmpty() or not int_geom.isGeosValid():
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ProcessingLog.addToLog(ProcessingLog.LOG_ERROR,
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self.tr('GEOS geoprocessing error: One or '
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'more input features have invalid '
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'geometry.'))
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break
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try:
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if int_geom.wkbType() in wkbTypeGroups[wkbTypeGroups[int_geom.wkbType()]]:
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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:
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ProcessingLog.addToLog(ProcessingLog.LOG_INFO,
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self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'))
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continue
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del writer
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