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102 lines
4.2 KiB
Python
102 lines
4.2 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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AddTableField.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 ParameterString
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from processing.core.parameters import ParameterNumber
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from processing.core.parameters import ParameterSelection
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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 AddTableField(GeoAlgorithm):
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OUTPUT_LAYER = 'OUTPUT_LAYER'
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INPUT_LAYER = 'INPUT_LAYER'
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FIELD_NAME = 'FIELD_NAME'
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FIELD_TYPE = 'FIELD_TYPE'
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FIELD_LENGTH = 'FIELD_LENGTH'
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FIELD_PRECISION = 'FIELD_PRECISION'
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TYPES = [QVariant.Int, QVariant.Double, QVariant.String]
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Add field to attributes table')
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self.group, self.i18n_group = self.trAlgorithm('Vector table tools')
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self.type_names = [self.tr('Integer'),
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self.tr('Float'),
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self.tr('String')]
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self.addParameter(ParameterVector(self.INPUT_LAYER,
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self.tr('Input layer'), [ParameterVector.VECTOR_TYPE_ANY], False))
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self.addParameter(ParameterString(self.FIELD_NAME,
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self.tr('Field name')))
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self.addParameter(ParameterSelection(self.FIELD_TYPE,
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self.tr('Field type'), self.type_names))
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self.addParameter(ParameterNumber(self.FIELD_LENGTH,
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self.tr('Field length'), 1, 255, 10))
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self.addParameter(ParameterNumber(self.FIELD_PRECISION,
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self.tr('Field precision'), 0, 10, 0))
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self.addOutput(OutputVector(
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self.OUTPUT_LAYER, self.tr('Added')))
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def processAlgorithm(self, progress):
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fieldType = self.getParameterValue(self.FIELD_TYPE)
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fieldName = self.getParameterValue(self.FIELD_NAME)
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fieldLength = self.getParameterValue(self.FIELD_LENGTH)
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fieldPrecision = self.getParameterValue(self.FIELD_PRECISION)
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output = self.getOutputFromName(self.OUTPUT_LAYER)
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layer = dataobjects.getObjectFromUri(
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self.getParameterValue(self.INPUT_LAYER))
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provider = layer.dataProvider()
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fields = provider.fields()
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fields.append(QgsField(fieldName, self.TYPES[fieldType], '',
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fieldLength, fieldPrecision))
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writer = output.getVectorWriter(fields, provider.geometryType(),
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layer.crs())
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outFeat = QgsFeature()
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inGeom = QgsGeometry()
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nElement = 0
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features = vector.features(layer)
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nFeat = len(features)
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for inFeat in features:
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progress.setPercentage(int(100 * nElement / nFeat))
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nElement += 1
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inGeom = inFeat.geometry()
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outFeat.setGeometry(inGeom)
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atMap = inFeat.attributes()
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atMap.append(None)
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outFeat.setAttributes(atMap)
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writer.addFeature(outFeat)
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del writer
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