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cc5b9bfe17
- setEllipsoidalMode() was removed. Ellipsoidal calculations are now enabled whenever a valid ellipsoid() has been set. Set the ellipsoid to 'NONE' to disable ellipsoidal calculations. - ellipsoidalEnabled() was removed. Ellipsoidal calculations are now enabled whenever a valid ellipsoid() is set. Check willUseEllipsoid() to determine whether ellipsoidal calculations will be performed. - sourceCrs() and setSourceCrs() now always take and return QgsCoordinateReferenceSystem objects. All string/ID based CRS methods were removed. - geographic() was removed. This was only used internally in one place, so was replaced with sourceCrs().isGeographic() instead. - some largely overlapping measurement functions were consolidated
176 lines
6.9 KiB
Python
176 lines
6.9 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 qgis.PyQt.QtCore import QVariant
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from qgis.core import (QgsExpression,
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QgsExpressionContext,
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QgsExpressionContextUtils,
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QgsFeature,
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QgsField,
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QgsDistanceArea,
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QgsProject,
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GEO_NONE,
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QgsApplication)
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.GeoAlgorithmExecutionException import 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
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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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TYPES = [QVariant.Double, QVariant.Int, QVariant.String, QVariant.Date]
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def icon(self):
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return QgsApplication.getThemeIcon("/providerQgis.svg")
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def svgIconPath(self):
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return QgsApplication.iconPath("providerQgis.svg")
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def group(self):
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return self.tr('Vector table tools')
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def name(self):
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return 'fieldcalculator'
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def displayName(self):
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return self.tr('Field calculator')
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def defineCharacteristics(self):
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self.type_names = [self.tr('Float'),
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self.tr('Integer'),
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self.tr('String'),
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self.tr('Date')]
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self.addParameter(ParameterVector(self.INPUT_LAYER,
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self.tr('Input layer')))
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self.addParameter(ParameterString(self.FIELD_NAME,
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self.tr('Result 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, 15, 3))
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self.addParameter(ParameterBoolean(self.NEW_FIELD,
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self.tr('Create new field'), True))
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self.addParameter(ParameterString(self.FORMULA, self.tr('Formula')))
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self.addOutput(OutputVector(self.OUTPUT_LAYER, self.tr('Calculated')))
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def processAlgorithm(self, feedback):
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layer = dataobjects.getLayerFromString(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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fields = layer.fields()
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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, layer.wkbType(),
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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())
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da.setEllipsoid(QgsProject.instance().ellipsoid())
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exp.setGeomCalculator(da)
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exp.setDistanceUnits(QgsProject.instance().distanceUnits())
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exp.setAreaUnits(QgsProject.instance().areaUnits())
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exp_context = QgsExpressionContext(QgsExpressionContextUtils.globalProjectLayerScopes(layer))
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if not exp.prepare(exp_context):
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raise GeoAlgorithmExecutionException(
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self.tr('Evaluation error: {0}').format(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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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_context.setFeature(f)
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exp_context.lastScope().setVariable("row_number", rownum)
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value = exp.evaluate(exp_context)
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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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feedback.setProgress(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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self.tr('An error occurred while evaluating the calculation '
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'string:\n{0}').format(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).strip()
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if newField and len(fieldName) == 0:
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return self.tr('Field name is not set. Please enter a field name')
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def getCustomParametersDialog(self):
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return FieldsCalculatorDialog(self)
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