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95 lines
3.8 KiB
Python
95 lines
3.8 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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SelectByAttributeSum.py
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---------------------
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Date : April 2015
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Copyright : (C) 2015 by Alexander Bruy
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Email : alexander dot bruy 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__ = 'Alexander Bruy'
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__date__ = 'April 2015'
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__copyright__ = '(C) 2015, Alexander Bruy'
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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 QgsSpatialIndex, QgsFeatureRequest, QgsGeometry
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterTableField
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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 SelectByAttributeSum(GeoAlgorithm):
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INPUT = 'INPUT'
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FIELD = 'FIELD'
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VALUE = 'VALUE'
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OUTPUT = 'OUTPUT'
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Select by attribute sum')
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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('Input Layer'), [ParameterVector.VECTOR_TYPE_ANY]))
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self.addParameter(ParameterTableField(self.FIELD,
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self.tr('Selection attribute'), self.INPUT, ParameterTableField.DATA_TYPE_NUMBER))
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self.addParameter(ParameterNumber(self.VALUE, self.tr('Value')))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Selected (attribute sum)'), True))
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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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fieldName = self.getParameterValue(self.FIELD)
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value = self.getParameterValue(self.VALUE)
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selected = layer.selectedFeaturesIds()
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if len(selected) == 0:
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GeoAlgorithmExecutionException(
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self.tr('There is no selection in the input layer. '
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'Select one feature and try again.'))
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ft = layer.selectedFeatures()[0]
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geom = QgsGeometry(ft.geometry())
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attrSum = ft[fieldName]
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idx = QgsSpatialIndex(layer.getFeatures())
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req = QgsFeatureRequest()
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completed = False
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while not completed:
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intersected = idx.intersects(geom.boundingBox())
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if len(intersected) < 0:
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progress.setInfo(self.tr('No adjacent features found.'))
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break
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for i in intersected:
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ft = layer.getFeatures(req.setFilterFid(i)).next()
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tmpGeom = QgsGeometry(ft.geometry())
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if tmpGeom.touches(geom):
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geom = tmpGeom.combine(geom)
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selected.append(i)
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attrSum += ft[fieldName]
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if attrSum >= value:
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completed = True
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break
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layer.setSelectedFeatures(selected)
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self.setOutputValue(self.OUTPUT, fileName)
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