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e7fe61e6b9
available or compatible QGIS version is used Some housekeeping in QGIS algorithms provider
83 lines
3.3 KiB
Python
83 lines
3.3 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 PyQt4.QtCore import QVariant
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from qgis.core import QgsField, QgsFeature, QgsGeometry
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from processing.core.GeoAlgorithm import GeoAlgorithm
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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.outputs import OutputVector
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from processing.tools import dataobjects, vector
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class EquivalentNumField(GeoAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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FIELD = 'FIELD'
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Add unique value index field')
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self.group, self.i18n_group = self.trAlgorithm('Vector table 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('Class field'), self.INPUT))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Layer with index field')))
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def processAlgorithm(self, progress):
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fieldname = self.getParameterValue(self.FIELD)
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output = self.getOutputFromName(self.OUTPUT)
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vlayer = dataobjects.getObjectFromUri(
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self.getParameterValue(self.INPUT))
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vprovider = vlayer.dataProvider()
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fieldindex = vlayer.fieldNameIndex(fieldname)
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fields = vprovider.fields()
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fields.append(QgsField('NUM_FIELD', QVariant.Int))
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writer = output.getVectorWriter(fields, vprovider.geometryType(),
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vlayer.crs())
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outFeat = QgsFeature()
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classes = {}
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features = vector.features(vlayer)
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total = 100.0 / len(features)
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for current, feature in enumerate(features):
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progress.setPercentage(int(current * total))
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inGeom = feature.geometry()
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outFeat.setGeometry(inGeom)
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atMap = feature.attributes()
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clazz = atMap[fieldindex]
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if clazz not in classes:
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classes[clazz] = len(classes.keys())
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atMap.append(classes[clazz])
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outFeat.setAttributes(atMap)
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writer.addFeature(outFeat)
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del writer
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