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05dc06d41e
It's not a complete fix, as it just comments out a line that was causing a 'underlying C/C++ object was deleted' error Should revisit is later. For now, this allows the algorithm to run correctly and not crash qgis
164 lines
6.5 KiB
Python
164 lines
6.5 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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FieldsCalculator.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 *
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from qgis.core import *
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from qgis.utils import iface
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.GeoAlgorithmExecutionException import \
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GeoAlgorithmExecutionException
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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 ParameterBoolean
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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, system
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from ui.FieldsCalculatorDialog import FieldsCalculatorDialog
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class FieldsCalculator(GeoAlgorithm):
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INPUT_LAYER = 'INPUT_LAYER'
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NEW_FIELD = 'NEW_FIELD'
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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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FORMULA = 'FORMULA'
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OUTPUT_LAYER = 'OUTPUT_LAYER'
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TYPE_NAMES = ['Float', 'Integer', 'String', 'Date']
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TYPES = [QVariant.Double, QVariant.Int, QVariant.String, QVariant.Date]
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def defineCharacteristics(self):
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self.name = 'Field calculator'
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self.group = 'Vector table tools'
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self.addParameter(ParameterVector(self.INPUT_LAYER, 'Input layer',
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[ParameterVector.VECTOR_TYPE_ANY], False))
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self.addParameter(ParameterString(self.FIELD_NAME, 'Result field name'
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))
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self.addParameter(ParameterSelection(self.FIELD_TYPE, 'Field type',
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self.TYPE_NAMES))
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self.addParameter(ParameterNumber(self.FIELD_LENGTH, 'Field length',
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1, 255, 10))
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self.addParameter(ParameterNumber(self.FIELD_PRECISION,
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'Field precision', 0, 15, 3))
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self.addParameter(ParameterBoolean(self.NEW_FIELD,
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'Create new field', True))
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self.addParameter(ParameterString(self.FORMULA, 'Formula'))
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self.addOutput(OutputVector(self.OUTPUT_LAYER, 'Output layer'))
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def processAlgorithm(self, progress):
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layer = dataobjects.getObjectFromUri(
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self.getParameterValue(self.INPUT_LAYER))
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fieldName = self.getParameterValue(self.FIELD_NAME)
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fieldType = self.TYPES[self.getParameterValue(self.FIELD_TYPE)]
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width = self.getParameterValue(self.FIELD_LENGTH)
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precision = self.getParameterValue(self.FIELD_PRECISION)
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newField = self.getParameterValue(self.NEW_FIELD)
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formula = self.getParameterValue(self.FORMULA)
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output = self.getOutputFromName(self.OUTPUT_LAYER)
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if output.value == '':
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ext = output.getDefaultFileExtension(self)
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output.value = system.getTempFilenameInTempFolder(output.name + '.' + ext)
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provider = layer.dataProvider()
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fields = layer.pendingFields()
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if newField:
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fields.append(QgsField(fieldName, fieldType, '', width, precision))
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writer = output.getVectorWriter(fields, provider.geometryType(),
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layer.crs())
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exp = QgsExpression(formula)
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da = QgsDistanceArea()
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da.setSourceCrs(layer.crs().srsid())
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#canvas = iface.mapCanvas()
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#da.setEllipsoidalMode(iface.mapCanvas().mapRenderer().hasCrsTransformEnabled())
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da.setEllipsoid(QgsProject.instance().readEntry('Measure',
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'/Ellipsoid',
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GEO_NONE)[0])
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exp.setGeomCalculator(da)
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if not exp.prepare(layer.pendingFields()):
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raise GeoAlgorithmExecutionException(
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'Evaluation error: ' + exp.evalErrorString())
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outFeature = QgsFeature()
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outFeature.initAttributes(len(fields))
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outFeature.setFields(fields)
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error = ''
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calculationSuccess = True
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current = 0
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features = vector.features(layer)
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total = 100.0 / len(features)
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rownum = 1
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for current, f in enumerate(features):
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rownum = current + 1
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exp.setCurrentRowNumber(rownum)
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value = exp.evaluate(f)
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if exp.hasEvalError():
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calculationSuccess = False
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error = exp.evalErrorString()
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break
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else:
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outFeature.setGeometry(f.geometry())
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for fld in f.fields():
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outFeature[fld.name()] = f[fld.name()]
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outFeature[fieldName] = value
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writer.addFeature(outFeature)
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progress.setPercentage(int(current * total))
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del writer
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if not calculationSuccess:
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raise GeoAlgorithmExecutionException(
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'An error occured while evaluating the calculation '
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'string:\n' + error)
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def checkParameterValuesBeforeExecuting(self):
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newField = self.getParameterValue(self.NEW_FIELD)
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fieldName = self.getParameterValue(self.FIELD_NAME)
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if newField and len(fieldName) == 0:
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raise GeoAlgorithmExecutionException('Field name is not set. '
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'Please enter a field name')
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outputName = self.getOutputValue(self.OUTPUT_LAYER)
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if outputName == '':
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raise GeoAlgorithmExecutionException('Output is not set. '
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'Please specify valid filename')
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def getCustomParametersDialog(self):
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return FieldsCalculatorDialog(self)
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