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# -*- coding: utf-8 -*-
"""
***************************************************************************
CalculatorModelerAlgorithm.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 qgis.PyQt.QtCore import Qt, QMetaObject
from qgis.PyQt.QtWidgets import QDialogButtonBox, QTextEdit, QLineEdit, QVBoxLayout
from processing.core.GeoAlgorithm import GeoAlgorithm
from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
from processing.core.parameters import ParameterString
from processing.core.parameters import ParameterNumber
from processing.core.outputs import OutputNumber
from processing.modeler.ModelerParametersDialog import ModelerParametersDialog
from processing.modeler.ModelerAlgorithm import Algorithm
FORMULA = 'FORMULA'
NUMBER = 'NUMBER'
RESULT = 'RESULT'
AVAILABLE_VARIABLES = 10
class CalculatorModelerAlgorithm(GeoAlgorithm):
def defineCharacteristics(self):
self.showInModeler = True
self.showInToolbox = False
self.name = self.tr('Calculator', 'CalculatorModelerAlgorithm')
self.group = self.tr('Modeler-only tools', 'CalculatorModelerAlgorithm')
self.addParameter(ParameterString(FORMULA,
self.tr('Formula', 'CalculatorModelerAlgorithm'), ''))
for i in range(AVAILABLE_VARIABLES):
self.addParameter(ParameterNumber(NUMBER
+ unicode(i), 'dummy', optional=True))
self.addOutput(OutputNumber(RESULT,
self.tr('Result', 'CalculatorModelerAlgorithm')))
def processAlgorithm(self, progress):
formula = self.getParameterValue(FORMULA)
for i in range(AVAILABLE_VARIABLES):
name = NUMBER + unicode(i)
num = self.getParameterValue(name)
formula = formula.replace(chr(97 + i), unicode(num))
try:
result = eval(formula)
self.setOutputValue(RESULT, result)
except:
raise GeoAlgorithmExecutionException(
self.tr('Wrong formula: %s', 'CalculatorModelerAlgorithm') % formula)
def getCustomModelerParametersDialog(self, modelAlg, algName=None):
return CalculatorModelerParametersDialog(self, modelAlg, algName)
class CalculatorModelerParametersDialog(ModelerParametersDialog):
def setupUi(self):
self.valueItems = {}
self.dependentItems = {}
self.resize(650, 450)
self.buttonBox = QDialogButtonBox()
self.buttonBox.setOrientation(Qt.Horizontal)
self.buttonBox.setStandardButtons(QDialogButtonBox.Cancel
| QDialogButtonBox.Ok)
self.infoText = QTextEdit()
numbers = self.getAvailableValuesOfType(ParameterNumber, OutputNumber)
text = self.tr('You can refer to model values in your formula, using '
'single-letter variables, as follows:\n', 'CalculatorModelerParametersDialog')
ichar = 97
if numbers:
for number in numbers:
text += chr(ichar) + '->' + self.resolveValueDescription(number) + '\n'
ichar += 1
else:
text += self.tr('\n - No numerical variables are available.', 'CalculatorModelerParametersDialog')
self.infoText.setText(text)
self.infoText.setEnabled(False)
self.formulaText = QLineEdit()
if hasattr(self.formulaText, 'setPlaceholderText'):
self.formulaText.setPlaceholderText(self.tr('[Enter your formula here]', 'CalculatorModelerParametersDialog'))
if self._algName is not None:
alg = self.model.algs[self._algName]
self.formulaText.setText(alg.params[FORMULA])
self.setWindowTitle(self.tr('Calculator', 'CalculatorModelerParametersDialog'))
self.verticalLayout = QVBoxLayout()
self.verticalLayout.setSpacing(2)
self.verticalLayout.setMargin(0)
self.verticalLayout.addWidget(self.infoText)
self.verticalLayout.addWidget(self.formulaText)
self.verticalLayout.addWidget(self.buttonBox)
self.setLayout(self.verticalLayout)
self.buttonBox.accepted.connect(self.okPressed)
self.buttonBox.rejected.connect(self.cancelPressed)
QMetaObject.connectSlotsByName(self)
def createAlgorithm(self):
alg = Algorithm('modelertools:calculator')
alg.setName(self.model)
alg.description = self.tr('Calculator', 'CalculatorModelerParametersDialog')
formula = self.formulaText.text()
alg.params[FORMULA] = formula
for i in xrange(AVAILABLE_VARIABLES):
paramname = NUMBER + unicode(i)
alg.params[paramname] = None
numbers = self.getAvailableValuesOfType(ParameterNumber, OutputNumber)
used = []
for i in range(len(numbers)):
if unicode(chr(i + 97)) in formula:
used.append(numbers[i])
for i, variable in enumerate(used):
paramname = NUMBER + unicode(i)
alg.params[paramname] = variable
# TODO check formula is correct
return alg
|
