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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.
106 lines
4.1 KiB
Python
106 lines
4.1 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 (QgsApplication,
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QgsSpatialIndex,
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QgsFeatureRequest,
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QgsProcessingUtils)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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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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class SelectByAttributeSum(QgisAlgorithm):
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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 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.addParameter(ParameterVector(self.INPUT,
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self.tr('Input Layer')))
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self.addParameter(ParameterTableField(self.FIELD,
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self.tr('Selection attribute'),
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self.INPUT,
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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 name(self):
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return 'selectbyattributesum'
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def displayName(self):
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return self.tr('Select by attribute sum')
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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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fieldName = self.getParameterValue(self.FIELD)
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value = self.getParameterValue(self.VALUE)
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selected = layer.selectedFeatureIds()
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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 = ft.geometry()
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attrSum = ft[fieldName]
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idx = QgsSpatialIndex(layer.getFeatures(QgsFeatureRequest.setSubsetOfAttributes([])))
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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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feedback.pushInfo(self.tr('No adjacent features found.'))
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break
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req = QgsFeatureRequest().setFilterFids(intersected).setSubsetOfAttributes([fieldName], layer.fields())
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for ft in layer.getFeatures(req):
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tmpGeom = ft.geometry()
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if tmpGeom.touches(geom):
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geom = tmpGeom.combine(geom)
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selected.append(ft.id())
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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.selectByIds(selected)
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self.setOutputValue(self.OUTPUT, fileName)
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