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85 lines
3.4 KiB
Python
85 lines
3.4 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 PyQt4.QtCore import *
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from qgis.core import *
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.parameters.ParameterVector import ParameterVector
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from processing.outputs.OutputVector 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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OUTPUT = 'OUTPUT'
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def defineCharacteristics(self):
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self.name = 'Extract by location'
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self.group = 'Vector selection tools'
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self.addParameter(ParameterVector(self.INPUT, '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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'Additional layer (intersection layer)',
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[ParameterVector.VECTOR_TYPE_ANY]))
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self.addOutput(OutputVector(self.OUTPUT, 'Selection'))
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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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index = vector.spatialindex(layer)
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geom = QgsGeometry()
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selectedSet = []
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current = 0
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features = vector.features(selectLayer)
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featureCount = len(features)
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total = 100.0 / float(len(features))
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for current,f in enumerate(features):
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geom = QgsGeometry(f.geometry())
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intersects = index.intersects(geom.boundingBox())
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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 = QgsGeometry(feat.geometry())
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if geom.intersects(tmpGeom):
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selectedSet.append(feat.id())
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progress.setPercentage(int(current * total))
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output = self.getOutputFromName(self.OUTPUT)
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writer = output.getVectorWriter(layer.layer.pendingFields().toList(),
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layer.geometryType(), layer.crs())
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for (i, feat) in enumerate(features):
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if feat.id() in selectedSet:
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writer.addFeature(feat)
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progress.setPercentage(100 * i / float(featureCount))
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del writer
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