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fd2c18ee16
temporary output layers in the provided processing context Should fix loss of intermediate memory layers when running a multi-step model
143 lines
5.8 KiB
Python
143 lines
5.8 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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ExtractByLocation.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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from qgis.core import (QgsFeatureRequest,
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QgsApplication,
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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.parameters import ParameterSelection
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from processing.core.parameters import ParameterNumber
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects, vector
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class ExtractByLocation(GeoAlgorithm):
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INPUT = 'INPUT'
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INTERSECT = 'INTERSECT'
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PREDICATE = 'PREDICATE'
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PRECISION = 'PRECISION'
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OUTPUT = 'OUTPUT'
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def icon(self):
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return QgsApplication.getThemeIcon("/providerQgis.svg")
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def svgIconPath(self):
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return QgsApplication.iconPath("providerQgis.svg")
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def tags(self):
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return self.tr('extract,filter,location,intersects,contains,within').split(',')
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def group(self):
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return self.tr('Vector selection tools')
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def name(self):
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return 'extractbylocation'
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def displayName(self):
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return self.tr('Extract by location')
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def defineCharacteristics(self):
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self.predicates = (
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('intersects', self.tr('intersects')),
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('contains', self.tr('contains')),
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('disjoint', self.tr('disjoint')),
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('equals', self.tr('equals')),
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('touches', self.tr('touches')),
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('overlaps', self.tr('overlaps')),
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('within', self.tr('within')),
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('crosses', self.tr('crosses')))
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self.addParameter(ParameterVector(self.INPUT,
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self.tr('Layer to select from')))
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self.addParameter(ParameterVector(self.INTERSECT,
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self.tr('Additional layer (intersection layer)')))
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self.addParameter(ParameterSelection(self.PREDICATE,
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self.tr('Geometric predicate'),
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self.predicates,
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multiple=True))
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self.addParameter(ParameterNumber(self.PRECISION,
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self.tr('Precision'),
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0.0, None, 0.0))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Extracted (location)')))
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def processAlgorithm(self, context, feedback):
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filename = self.getParameterValue(self.INPUT)
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layer = dataobjects.getLayerFromString(filename)
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filename = self.getParameterValue(self.INTERSECT)
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selectLayer = dataobjects.getLayerFromString(filename)
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predicates = self.getParameterValue(self.PREDICATE)
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precision = self.getParameterValue(self.PRECISION)
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index = vector.spatialindex(layer)
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output = self.getOutputFromName(self.OUTPUT)
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writer = output.getVectorWriter(layer.fields(), layer.wkbType(), layer.crs(), context)
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if 'disjoint' in predicates:
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disjoinSet = []
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for feat in QgsProcessingUtils.getFeatures(layer, context):
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disjoinSet.append(feat.id())
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selectedSet = []
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features = QgsProcessingUtils.getFeatures(selectLayer, context)
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total = 100.0 / QgsProcessingUtils.featureCount(selectLayer, context)
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for current, f in enumerate(features):
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geom = vector.snapToPrecision(f.geometry(), precision)
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bbox = vector.bufferedBoundingBox(geom.boundingBox(), 0.51 * precision)
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intersects = index.intersects(bbox)
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request = QgsFeatureRequest().setFilterFids(intersects).setSubsetOfAttributes([])
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for feat in layer.getFeatures(request):
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tmpGeom = vector.snapToPrecision(feat.geometry(), precision)
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res = False
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for predicate in predicates:
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if predicate == 'disjoint':
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if tmpGeom.intersects(geom):
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try:
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disjoinSet.remove(feat.id())
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except:
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pass # already removed
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else:
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res = getattr(tmpGeom, predicate)(geom)
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if res:
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selectedSet.append(feat.id())
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break
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feedback.setProgress(int(current * total))
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if 'disjoint' in predicates:
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selectedSet = selectedSet + disjoinSet
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features = QgsProcessingUtils.getFeatures(layer, context)
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total = 100.0 / QgsProcessingUtils.featureCount(layer, context)
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for current, f in enumerate(features):
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if f.id() in selectedSet:
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writer.addFeature(f)
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feedback.setProgress(int(current * total))
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del writer
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