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203 lines
8.3 KiB
Python
203 lines
8.3 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 qgis.PyQt.QtGui import QIcon
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from qgis.core import (QgsFeatureRequest,
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QgsFeature,
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QgsFields,
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QgsFeatureSink,
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QgsGeometry,
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QgsWkbTypes,
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QgsProcessingException,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterFeatureSink,
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QgsSpatialIndex,
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QgsProcessingParameterField)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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from processing.tools import 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(QgisAlgorithm):
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INPUT = 'INPUT'
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OVERLAY = 'OVERLAY'
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OUTPUT = 'OUTPUT'
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INPUT_FIELDS = 'INPUT_FIELDS'
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OVERLAY_FIELDS = 'OVERLAY_FIELDS'
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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'intersect.png'))
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def group(self):
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return self.tr('Vector overlay')
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def __init__(self):
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super().__init__()
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def initAlgorithm(self, config=None):
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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
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self.tr('Input layer')))
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self.addParameter(QgsProcessingParameterFeatureSource(self.OVERLAY,
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self.tr('Intersection layer')))
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self.addParameter(QgsProcessingParameterField(
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self.INPUT_FIELDS,
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self.tr('Input fields to keep (leave empty to keep all fields)'),
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parentLayerParameterName=self.INPUT,
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optional=True, allowMultiple=True))
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self.addParameter(QgsProcessingParameterField(
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self.OVERLAY_FIELDS,
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self.tr('Intersect fields to keep (leave empty to keep all fields)'),
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parentLayerParameterName=self.OVERLAY,
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optional=True, allowMultiple=True))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Intersection')))
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def name(self):
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return 'intersection'
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def displayName(self):
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return self.tr('Intersection')
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def processAlgorithm(self, parameters, context, feedback):
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sourceA = self.parameterAsSource(parameters, self.INPUT, context)
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sourceB = self.parameterAsSource(parameters, self.OVERLAY, context)
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geomType = QgsWkbTypes.multiType(sourceA.wkbType())
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fieldsA = self.parameterAsFields(parameters, self.INPUT_FIELDS, context)
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fieldsB = self.parameterAsFields(parameters, self.OVERLAY_FIELDS, context)
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fieldListA = QgsFields()
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field_indices_a = []
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if len(fieldsA) > 0:
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for f in fieldsA:
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idxA = sourceA.fields().lookupField(f)
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if idxA >= 0:
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field_indices_a.append(idxA)
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fieldListA.append(sourceA.fields()[idxA])
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else:
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fieldListA = sourceA.fields()
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field_indices_a = [i for i in range(0, fieldListA.count())]
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fieldListB = QgsFields()
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field_indices_b = []
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if len(fieldsB) > 0:
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for f in fieldsB:
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idxB = sourceB.fields().lookupField(f)
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if idxB >= 0:
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field_indices_b.append(idxB)
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fieldListB.append(sourceB.fields()[idxB])
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else:
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fieldListB = sourceB.fields()
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field_indices_b = [i for i in range(0, fieldListB.count())]
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fieldListB = vector.testForUniqueness(fieldListA, fieldListB)
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for b in fieldListB:
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fieldListA.append(b)
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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fieldListA, geomType, sourceA.sourceCrs())
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outFeat = QgsFeature()
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indexB = QgsSpatialIndex(sourceB.getFeatures(QgsFeatureRequest().setSubsetOfAttributes([]).setDestinationCrs(sourceA.sourceCrs())), feedback)
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total = 100.0 / sourceA.featureCount() if sourceA.featureCount() else 1
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count = 0
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for featA in sourceA.getFeatures(QgsFeatureRequest().setSubsetOfAttributes(field_indices_a)):
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if feedback.isCanceled():
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break
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if not featA.hasGeometry():
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continue
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geom = featA.geometry()
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atMapA = featA.attributes()
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intersects = indexB.intersects(geom.boundingBox())
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request = QgsFeatureRequest().setFilterFids(intersects)
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request.setDestinationCrs(sourceA.sourceCrs())
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request.setSubsetOfAttributes(field_indices_b)
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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 featB in sourceB.getFeatures(request):
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if feedback.isCanceled():
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break
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tmpGeom = featB.geometry()
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if engine.intersects(tmpGeom.geometry()):
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out_attributes = [featA.attributes()[i] for i in field_indices_a]
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out_attributes.extend([featB.attributes()[i] for i in field_indices_b])
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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.isEmpty() or not int_geom.isGeosValid():
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raise QgsProcessingException(
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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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outFeat.setAttributes(out_attributes)
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sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
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except:
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raise QgsProcessingException(
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self.tr('Feature geometry error: One or more '
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'output features ignored due to invalid '
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'geometry.'))
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count += 1
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feedback.setProgress(int(count * total))
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return {self.OUTPUT: dest_id}
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