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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.
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.QgsProcessingUtils.mapLayerFromString(filename, context)
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filename = self.getParameterValue(self.INTERSECT)
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selectLayer = dataobjects.QgsProcessingUtils.mapLayerFromString(filename, context)
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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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