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f84d703234
Algorithms and other processing code should use this method (instead of dataobjects.getLayerFromString) to retrieve layers from a string, as it considers the processing context and allows resolving strings to temporarily stored layers. This permits processing models to function correctly when intermediate results are stored as memory layers. Subsequent model algorithms can then access these temporary layers as inputs. All temporary layers will be removed when the context object is destroyed after the model algorithm is run.
244 lines
11 KiB
Python
244 lines
11 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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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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QgsGeometry,
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QgsWkbTypes,
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QgsMessageLog,
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QgsProcessingUtils)
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from processing.core.GeoAlgorithm import GeoAlgorithm
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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 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 icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'union.png'))
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def group(self):
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return self.tr('Vector overlay tools')
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def name(self):
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return 'union'
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def displayName(self):
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return self.tr('Union')
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def defineCharacteristics(self):
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self.addParameter(ParameterVector(Union.INPUT,
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self.tr('Input layer')))
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self.addParameter(ParameterVector(Union.INPUT2,
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self.tr('Input layer 2')))
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self.addOutput(OutputVector(Union.OUTPUT, self.tr('Union')))
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def processAlgorithm(self, context, feedback):
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vlayerA = dataobjects.QgsProcessingUtils.mapLayerFromString(self.getParameterValue(Union.INPUT), context)
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vlayerB = dataobjects.QgsProcessingUtils.mapLayerFromString(self.getParameterValue(Union.INPUT2), context)
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geomType = vlayerA.wkbType()
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fields = vector.combineVectorFields(vlayerA, vlayerB)
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writer = self.getOutputFromName(Union.OUTPUT).getVectorWriter(fields, geomType, vlayerA.crs(), context)
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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 = QgsProcessingUtils.getFeatures(vlayerA, context)
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nFeat = QgsProcessingUtils.featureCount(vlayerA, context)
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for inFeatA in featuresA:
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feedback.setProgress(nElement / float(nFeat) * 50)
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nElement += 1
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lstIntersectingB = []
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geom = 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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QgsMessageLog.logMessage(self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'),
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self.tr('Processing'), QgsMessageLog.INFO)
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else:
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request = QgsFeatureRequest().setFilterFids(intersects)
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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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count += 1
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atMapB = inFeatB.attributes()
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tmpGeom = inFeatB.geometry()
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if engine.intersects(tmpGeom.geometry()):
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int_geom = geom.intersection(tmpGeom)
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lstIntersectingB.append(tmpGeom)
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if not int_geom:
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# There was a problem creating the intersection
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QgsMessageLog.logMessage(self.tr('GEOS geoprocessing error: One or more input features have invalid geometry.'),
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self.tr('Processing'), QgsMessageLog.INFO)
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int_geom = QgsGeometry()
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else:
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int_geom = QgsGeometry(int_geom)
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if int_geom.wkbType() == QgsWkbTypes.Unknown or QgsWkbTypes.flatType(int_geom.geometry().wkbType()) == QgsWkbTypes.GeometryCollection:
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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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outFeat.setAttributes(atMapA + atMapB)
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writer.addFeature(outFeat)
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except:
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QgsMessageLog.logMessage(self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'),
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self.tr('Processing'), QgsMessageLog.INFO)
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else:
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# Geometry list: prevents writing error
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# in geometries of different types
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# produced by the intersection
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# fix #3549
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if int_geom.wkbType() in wkbTypeGroups[wkbTypeGroups[int_geom.wkbType()]]:
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try:
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outFeat.setGeometry(int_geom)
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outFeat.setAttributes(atMapA + atMapB)
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writer.addFeature(outFeat)
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except:
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QgsMessageLog.logMessage(self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'),
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self.tr('Processing'), QgsMessageLog.INFO)
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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 or QgsWkbTypes.flatType(diff_geom.geometry().wkbType()) == QgsWkbTypes.GeometryCollection:
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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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try:
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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:
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QgsMessageLog.logMessage(self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'),
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self.tr('Processing'), QgsMessageLog.INFO)
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length = len(vlayerA.fields())
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atMapA = [None] * length
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featuresA = QgsProcessingUtils.getFeatures(vlayerB, context)
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nFeat = QgsProcessingUtils.featureCount(vlayerB, context)
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for inFeatA in featuresA:
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feedback.setProgress(nElement / float(nFeat) * 100)
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add = False
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geom = 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:
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QgsMessageLog.logMessage(self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'),
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self.tr('Processing'), QgsMessageLog.INFO)
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else:
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request = QgsFeatureRequest().setFilterFids(intersects)
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# use prepared geometries for faster intersection tests
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engine = QgsGeometry.createGeometryEngine(diff_geom.geometry())
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engine.prepareGeometry()
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for inFeatB in vlayerA.getFeatures(request):
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atMapB = inFeatB.attributes()
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tmpGeom = inFeatB.geometry()
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if engine.intersects(tmpGeom.geometry()):
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add = True
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diff_geom = QgsGeometry(diff_geom.difference(tmpGeom))
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else:
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try:
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# Ihis only happens 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:
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QgsMessageLog.logMessage(self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'),
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self.tr('Processing'), QgsMessageLog.INFO)
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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:
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QgsMessageLog.logMessage(self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'),
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self.tr('Processing'), QgsMessageLog.INFO)
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nElement += 1
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del writer
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