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129 lines
5.9 KiB
Python
129 lines
5.9 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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from builtins import next
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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 qgis.PyQt.QtGui import QIcon
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from qgis.core import Qgis, QgsFeatureRequest, QgsFeature, QgsGeometry, QgsWkbTypes, 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': (QgsWkbTypes.Point, QgsWkbTypes.MultiPoint, QgsWkbTypes.Point25D, QgsWkbTypes.MultiPoint25D,),
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'LineString': (QgsWkbTypes.LineString, QgsWkbTypes.MultiLineString, QgsWkbTypes.LineString25D, QgsWkbTypes.MultiLineString25D,),
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'Polygon': (QgsWkbTypes.Polygon, QgsWkbTypes.MultiPolygon, QgsWkbTypes.Polygon25D, QgsWkbTypes.MultiPolygon25D,),
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}
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for key, value in list(wkbTypeGroups.items()):
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for const in value:
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wkbTypeGroups[const] = key
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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')))
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self.addParameter(ParameterVector(self.INPUT2,
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self.tr('Intersect layer')))
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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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geomType = QgsWkbTypes.multiType(vlayerA.wkbType())
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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, vlayerA.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 = inFeatA.geometry()
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atMapA = inFeatA.attributes()
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intersects = index.intersects(geom.boundingBox())
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request = QgsFeatureRequest().setFilterFids(intersects)
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engine = None
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if len(intersects) > 0:
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# use prepared geometries for faster intersection tests
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engine = QgsGeometry.createGeometryEngine(geom.geometry())
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engine.prepareGeometry()
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for inFeatB in vlayerB.getFeatures(request):
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tmpGeom = inFeatB.geometry()
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if engine.intersects(tmpGeom.geometry()):
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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() == QgsWkbTypes.Unknown or QgsWkbTypes.flatType(int_geom.geometry().wkbType()) == QgsWkbTypes.GeometryCollection:
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int_com = geom.combine(tmpGeom)
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int_geom = QgsGeometry()
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if int_com:
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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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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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