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b1cadb1822
have specific icons, instead of generic qgis icon We consider these 'top level' algorithms, and using the standard algorithm icon should help reflect this and differentiate them from 3rd party algorithms.
140 lines
5.8 KiB
Python
140 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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QgsFeatureSink,
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QgsApplication,
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QgsProcessingUtils)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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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 vector
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class ExtractByLocation(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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OUTPUT = 'OUTPUT'
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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 __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.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 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 processAlgorithm(self, parameters, context, feedback):
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filename = self.getParameterValue(self.INPUT)
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layer = QgsProcessingUtils.mapLayerFromString(filename, context)
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filename = self.getParameterValue(self.INTERSECT)
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selectLayer = 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 = QgsProcessingUtils.createSpatialIndex(layer, context)
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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 / 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 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 / layer.featureCount() if layer.featureCount() else 0
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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, QgsFeatureSink.FastInsert)
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feedback.setProgress(int(current * total))
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del writer
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