mirror of
https://github.com/qgis/QGIS.git
synced 2025-10-31 00:06:02 -04:00
956c155e8f
pep8 --ignore=E111,E128,E201,E202,E203,E211,E221,E222,E225,E226,E227,E231,E241,E261,E265,E272,E302,E303,E501,E701 \
--exclude="ui_*.py,debian/*,python/ext-libs/*" \
.
162 lines
6.5 KiB
Python
162 lines
6.5 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
FieldsCalculator.py
|
|
---------------------
|
|
Date : August 2012
|
|
Copyright : (C) 2012 by Victor Olaya
|
|
Email : volayaf at gmail dot com
|
|
***************************************************************************
|
|
* *
|
|
* This program is free software; you can redistribute it and/or modify *
|
|
* it under the terms of the GNU General Public License as published by *
|
|
* the Free Software Foundation; either version 2 of the License, or *
|
|
* (at your option) any later version. *
|
|
* *
|
|
***************************************************************************
|
|
"""
|
|
|
|
__author__ = 'Victor Olaya'
|
|
__date__ = 'August 2012'
|
|
__copyright__ = '(C) 2012, Victor Olaya'
|
|
|
|
# This will get replaced with a git SHA1 when you do a git archive
|
|
|
|
__revision__ = '$Format:%H$'
|
|
|
|
from PyQt4.QtCore import QVariant
|
|
from qgis.core import QgsExpression, QgsFeature, QgsField, QgsDistanceArea, QgsProject, GEO_NONE
|
|
from qgis.utils import iface
|
|
from processing.core.GeoAlgorithm import GeoAlgorithm
|
|
from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
|
|
from processing.core.parameters import ParameterVector
|
|
from processing.core.parameters import ParameterString
|
|
from processing.core.parameters import ParameterNumber
|
|
from processing.core.parameters import ParameterBoolean
|
|
from processing.core.parameters import ParameterSelection
|
|
from processing.core.outputs import OutputVector
|
|
from processing.tools import dataobjects, vector, system
|
|
|
|
from ui.FieldsCalculatorDialog import FieldsCalculatorDialog
|
|
|
|
class FieldsCalculator(GeoAlgorithm):
|
|
|
|
INPUT_LAYER = 'INPUT_LAYER'
|
|
NEW_FIELD = 'NEW_FIELD'
|
|
FIELD_NAME = 'FIELD_NAME'
|
|
FIELD_TYPE = 'FIELD_TYPE'
|
|
FIELD_LENGTH = 'FIELD_LENGTH'
|
|
FIELD_PRECISION = 'FIELD_PRECISION'
|
|
FORMULA = 'FORMULA'
|
|
OUTPUT_LAYER = 'OUTPUT_LAYER'
|
|
|
|
TYPE_NAMES = ['Float', 'Integer', 'String', 'Date']
|
|
TYPES = [QVariant.Double, QVariant.Int, QVariant.String, QVariant.Date]
|
|
|
|
def defineCharacteristics(self):
|
|
self.name = 'Field calculator'
|
|
self.group = 'Vector table tools'
|
|
self.addParameter(ParameterVector(self.INPUT_LAYER,
|
|
self.tr('Input layer'), [ParameterVector.VECTOR_TYPE_ANY], False))
|
|
self.addParameter(ParameterString(self.FIELD_NAME,
|
|
self.tr('Result field name')))
|
|
self.addParameter(ParameterSelection(self.FIELD_TYPE,
|
|
self.tr('Field type'), self.TYPE_NAMES))
|
|
self.addParameter(ParameterNumber(self.FIELD_LENGTH,
|
|
self.tr('Field length'), 1, 255, 10))
|
|
self.addParameter(ParameterNumber(self.FIELD_PRECISION,
|
|
self.tr('Field precision'), 0, 15, 3))
|
|
self.addParameter(ParameterBoolean(self.NEW_FIELD,
|
|
self.tr('Create new field'), True))
|
|
self.addParameter(ParameterString(self.FORMULA, self.tr('Formula')))
|
|
self.addOutput(OutputVector(self.OUTPUT_LAYER, self.tr('Output layer')))
|
|
|
|
def processAlgorithm(self, progress):
|
|
layer = dataobjects.getObjectFromUri(self.getParameterValue(self.INPUT_LAYER))
|
|
fieldName = self.getParameterValue(self.FIELD_NAME)
|
|
fieldType = self.TYPES[self.getParameterValue(self.FIELD_TYPE)]
|
|
width = self.getParameterValue(self.FIELD_LENGTH)
|
|
precision = self.getParameterValue(self.FIELD_PRECISION)
|
|
newField = self.getParameterValue(self.NEW_FIELD)
|
|
formula = self.getParameterValue(self.FORMULA)
|
|
|
|
output = self.getOutputFromName(self.OUTPUT_LAYER)
|
|
|
|
if output.value == '':
|
|
ext = output.getDefaultFileExtension(self)
|
|
output.value = system.getTempFilenameInTempFolder(
|
|
output.name + '.' + ext)
|
|
|
|
provider = layer.dataProvider()
|
|
fields = layer.pendingFields()
|
|
if newField:
|
|
fields.append(QgsField(fieldName, fieldType, '', width, precision))
|
|
|
|
writer = output.getVectorWriter(fields, provider.geometryType(),
|
|
layer.crs())
|
|
|
|
exp = QgsExpression(formula)
|
|
|
|
da = QgsDistanceArea()
|
|
da.setSourceCrs(layer.crs().srsid())
|
|
da.setEllipsoidalMode(
|
|
iface.mapCanvas().mapSettings().hasCrsTransformEnabled())
|
|
da.setEllipsoid(QgsProject.instance().readEntry(
|
|
'Measure', '/Ellipsoid', GEO_NONE)[0])
|
|
exp.setGeomCalculator(da)
|
|
|
|
if not exp.prepare(layer.pendingFields()):
|
|
raise GeoAlgorithmExecutionException(
|
|
self.tr('Evaluation error: %s' % exp.evalErrorString()))
|
|
|
|
outFeature = QgsFeature()
|
|
outFeature.initAttributes(len(fields))
|
|
outFeature.setFields(fields)
|
|
|
|
error = ''
|
|
calculationSuccess = True
|
|
|
|
current = 0
|
|
features = vector.features(layer)
|
|
total = 100.0 / len(features)
|
|
|
|
rownum = 1
|
|
for current, f in enumerate(features):
|
|
rownum = current + 1
|
|
exp.setCurrentRowNumber(rownum)
|
|
value = exp.evaluate(f)
|
|
if exp.hasEvalError():
|
|
calculationSuccess = False
|
|
error = exp.evalErrorString()
|
|
break
|
|
else:
|
|
outFeature.setGeometry(f.geometry())
|
|
for fld in f.fields():
|
|
outFeature[fld.name()] = f[fld.name()]
|
|
outFeature[fieldName] = value
|
|
writer.addFeature(outFeature)
|
|
|
|
progress.setPercentage(int(current * total))
|
|
del writer
|
|
|
|
if not calculationSuccess:
|
|
raise GeoAlgorithmExecutionException(
|
|
self.tr('An error occured while evaluating the calculation '
|
|
'string:\n%s' % error))
|
|
|
|
def checkParameterValuesBeforeExecuting(self):
|
|
newField = self.getParameterValue(self.NEW_FIELD)
|
|
fieldName = self.getParameterValue(self.FIELD_NAME)
|
|
if newField and len(fieldName) == 0:
|
|
raise GeoAlgorithmExecutionException(
|
|
self.tr('Field name is not set. Please enter a field name'))
|
|
|
|
outputName = self.getOutputValue(self.OUTPUT_LAYER)
|
|
if outputName == '':
|
|
raise GeoAlgorithmExecutionException(
|
|
self.tr('Output is not set. Please specify valid filename'))
|
|
|
|
def getCustomParametersDialog(self):
|
|
return FieldsCalculatorDialog(self)
|