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e7fe61e6b9
available or compatible QGIS version is used Some housekeeping in QGIS algorithms provider
131 lines
5.8 KiB
Python
131 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 QGis, QgsFeatureRequest, QgsGeometry
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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 ParameterGeometryPredicate
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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 defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Extract by location')
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self.group, self.i18n_group = self.trAlgorithm('Vector selection tools')
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self.addParameter(ParameterVector(self.INPUT,
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self.tr('Layer to select from'),
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[ParameterVector.VECTOR_TYPE_ANY]))
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self.addParameter(ParameterVector(self.INTERSECT,
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self.tr('Additional layer (intersection layer)'),
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[ParameterVector.VECTOR_TYPE_ANY]))
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self.addParameter(ParameterGeometryPredicate(self.PREDICATE,
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self.tr('Geometric predicate'),
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left=self.INPUT, right=self.INTERSECT))
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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, progress):
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filename = self.getParameterValue(self.INPUT)
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layer = dataobjects.getObjectFromUri(filename)
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filename = self.getParameterValue(self.INTERSECT)
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selectLayer = dataobjects.getObjectFromUri(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.pendingFields(),
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layer.dataProvider().geometryType(), layer.crs())
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if 'disjoint' in predicates:
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disjoinSet = []
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for feat in vector.features(layer):
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disjoinSet.append(feat.id())
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selectedSet = []
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features = vector.features(selectLayer)
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total = 100.0 / len(features)
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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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for i in intersects:
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request = QgsFeatureRequest().setFilterFid(i)
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feat = layer.getFeatures(request).next()
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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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if predicate == 'intersects':
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res = tmpGeom.intersects(geom)
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elif predicate == 'contains':
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res = tmpGeom.contains(geom)
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elif predicate == 'equals':
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res = tmpGeom.equals(geom)
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elif predicate == 'touches':
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res = tmpGeom.touches(geom)
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elif predicate == 'overlaps':
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res = tmpGeom.overlaps(geom)
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elif predicate == 'within':
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res = tmpGeom.within(geom)
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elif predicate == 'crosses':
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res = tmpGeom.crosses(geom)
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if res:
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selectedSet.append(feat.id())
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break
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progress.setPercentage(int(current * total))
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if 'disjoint' in predicates:
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selectedSet = selectedSet + disjoinSet
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features = vector.features(layer)
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total = 100.0 / len(features)
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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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progress.setPercentage(int(current * total))
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del writer
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