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164 lines
6.6 KiB
Python
164 lines
6.6 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 processing import interface
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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.parameters.ParameterVector import ParameterVector
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from processing.parameters.ParameterString import ParameterString
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from processing.parameters.ParameterNumber import ParameterNumber
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from processing.parameters.ParameterBoolean import ParameterBoolean
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from processing.parameters.ParameterSelection import ParameterSelection
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from processing.outputs.OutputVector 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 = interface.iface.mapCanvas()
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da.setEllipsoidalMode(canvas.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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