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Instead we output an empty layer - this may be critical for multi-step models where there is validly no features present in a source layer
155 lines
6.2 KiB
Python
155 lines
6.2 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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SelectByLocation.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 QgsGeometry, QgsFeatureRequest, QgsProcessingUtils
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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from processing.core.parameters import ParameterSelection
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from processing.core.parameters import ParameterVector
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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 vector
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class SelectByLocation(QgisAlgorithm):
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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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METHOD = 'METHOD'
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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', 'select_location.png'))
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def group(self):
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return self.tr('Vector selection tools')
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def __init__(self):
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super().__init__()
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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.methods = [self.tr('creating new selection'),
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self.tr('adding to current selection'),
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self.tr('removing from current selection')]
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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.addParameter(ParameterSelection(self.METHOD,
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self.tr('Modify current selection by'),
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self.methods, 0))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Selected (location)'), True))
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def name(self):
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return 'selectbylocation'
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def displayName(self):
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return self.tr('Select by location')
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def processAlgorithm(self, parameters, context, feedback):
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filename = self.getParameterValue(self.INPUT)
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inputLayer = QgsProcessingUtils.mapLayerFromString(filename, context)
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method = self.getParameterValue(self.METHOD)
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filename2 = self.getParameterValue(self.INTERSECT)
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selectLayer = QgsProcessingUtils.mapLayerFromString(filename2, context)
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predicates = self.getParameterValue(self.PREDICATE)
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precision = self.getParameterValue(self.PRECISION)
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oldSelection = set(inputLayer.selectedFeatureIds())
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inputLayer.removeSelection()
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index = QgsProcessingUtils.createSpatialIndex(inputLayer, context)
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if 'disjoint' in predicates:
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disjoinSet = []
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for feat in QgsProcessingUtils.getFeatures(inputLayer, context):
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disjoinSet.append(feat.id())
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geom = QgsGeometry()
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selectedSet = []
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features = QgsProcessingUtils.getFeatures(selectLayer, context)
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total = 100.0 / selectLayer.featureCount() if selectLayer.featureCount() else 0
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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 = geom.boundingBox()
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bbox.grow(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 inputLayer.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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if method == 1:
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selectedSet = list(oldSelection.union(selectedSet))
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elif method == 2:
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selectedSet = list(oldSelection.difference(selectedSet))
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inputLayer.selectByIds(selectedSet)
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self.setOutputValue(self.OUTPUT, filename)
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