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96 lines
3.5 KiB
Python
96 lines
3.5 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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EquivalentNumField.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.PyQt.QtCore import QVariant
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from qgis.core import (QgsField,
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QgsFeatureSink,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterField,
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QgsProcessingParameterFeatureSink)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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class EquivalentNumField(QgisAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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FIELD = 'FIELD'
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def group(self):
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return self.tr('Vector table')
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def __init__(self):
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super().__init__()
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def initAlgorithm(self, config=None):
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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
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self.tr('Input layer')))
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self.addParameter(QgsProcessingParameterField(self.FIELD,
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self.tr('Class field'),
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None, self.INPUT, QgsProcessingParameterField.Any))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Layer with index field')))
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def name(self):
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return 'adduniquevalueindexfield'
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def displayName(self):
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return self.tr('Add unique value index field')
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def processAlgorithm(self, parameters, context, feedback):
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source = self.parameterAsSource(parameters, self.INPUT, context)
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fields = source.fields()
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fields.append(QgsField('NUM_FIELD', QVariant.Int))
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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fields, source.wkbType(), source.sourceCrs())
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field_name = self.parameterAsString(parameters, self.FIELD, context)
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field_index = source.fields().lookupField(field_name)
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classes = {}
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features = source.getFeatures()
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total = 100.0 / source.featureCount() if source.featureCount() else 0
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for current, feature in enumerate(features):
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if feedback.isCanceled():
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break
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feedback.setProgress(int(current * total))
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attributes = feature.attributes()
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clazz = attributes[field_index]
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if clazz not in classes:
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classes[clazz] = len(list(classes.keys()))
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attributes.append(classes[clazz])
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feature.setAttributes(attributes)
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sink.addFeature(feature, QgsFeatureSink.FastInsert)
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return {self.OUTPUT: dest_id}
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