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[processing] Select by atribute sum algorithm
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python/plugins/processing/algs/qgis/SelectByAttributeSum.py
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# -*- coding: utf-8 -*- | ||
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""" | ||
*************************************************************************** | ||
SelectByAttributeSum.py | ||
--------------------- | ||
Date : April 2015 | ||
Copyright : (C) 2015 by Alexander Bruy | ||
Email : alexander dot bruy at gmail dot com | ||
*************************************************************************** | ||
* * | ||
* This program is free software; you can redistribute it and/or modify * | ||
* it under the terms of the GNU General Public License as published by * | ||
* the Free Software Foundation; either version 2 of the License, or * | ||
* (at your option) any later version. * | ||
* * | ||
*************************************************************************** | ||
""" | ||
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__author__ = 'Alexander Bruy' | ||
__date__ = 'April 2015' | ||
__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 | ||
from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException | ||
from processing.core.parameters import ParameterVector | ||
from processing.core.parameters import ParameterTableField | ||
from processing.core.parameters import ParameterNumber | ||
from processing.core.outputs import OutputVector | ||
from processing.tools import dataobjects, vector | ||
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class SelectByAttributeSum(GeoAlgorithm): | ||
INPUT = 'INPUT' | ||
FIELD = 'FIELD' | ||
VALUE = 'VALUE' | ||
OUTPUT = 'OUTPUT' | ||
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def defineCharacteristics(self): | ||
self.name = 'Select by attribute sum' | ||
self.group = 'Vector selection tools' | ||
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self.addParameter(ParameterVector(self.INPUT, | ||
self.tr('Input Layer'), [ParameterVector.VECTOR_TYPE_ANY])) | ||
self.addParameter(ParameterTableField(self.FIELD, | ||
self.tr('Selection attribute'), self.INPUT, ParameterTableField.DATA_TYPE_NUMBER)) | ||
self.addParameter(ParameterNumber(self.VALUE, self.tr('Value'))) | ||
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Output'), True)) | ||
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def processAlgorithm(self, progress): | ||
fileName = self.getParameterValue(self.INPUT) | ||
layer = dataobjects.getObjectFromUri(fileName) | ||
fieldName = self.getParameterValue(self.FIELD) | ||
value = self.getParameterValue(self.VALUE) | ||
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selected = layer.selectedFeaturesIds() | ||
if len(selected) == 0: | ||
GeoAlgorithmExecutionException( | ||
self.tr('There is no selection in the input layer. ' | ||
'Select one feature and try again.')) | ||
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ft = layer.selectedFeatures()[0] | ||
geom = QgsGeometry(ft.geometry()) | ||
attrSum = ft[fieldName] | ||
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idx = QgsSpatialIndex(layer.getFeatures()) | ||
req = QgsFeatureRequest() | ||
completed = False | ||
while not completed: | ||
intersected = idx.intersects(geom.boundingBox()) | ||
if len(intersected) < 0: | ||
progress.setInfo(self.tr('No adjacent features found.')) | ||
break | ||
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for i in intersected: | ||
ft = layer.getFeatures(req.setFilterFid(i)).next() | ||
tmpGeom = QgsGeometry(ft.geometry()) | ||
if tmpGeom.touches(geom): | ||
geom = tmpGeom.combine(geom) | ||
selected.append(i) | ||
attrSum += ft[fieldName] | ||
if attrSum >= value: | ||
completed = True | ||
break | ||
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layer.setSelectedFeatures(selected) | ||
self.setOutputValue(self.OUTPUT, fileName) |