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143 lines
6.0 KiB
Python
143 lines
6.0 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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CalculatorModelerAlgorithm.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 Qt, QObject, QMetaObject, SIGNAL
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from PyQt4.QtGui import QDialogButtonBox, QTextEdit, QLineEdit, QVBoxLayout
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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 ParameterString
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from processing.core.parameters import ParameterNumber
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from processing.core.outputs import OutputNumber
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from processing.modeler.ModelerParametersDialog import ModelerParametersDialog
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from processing.modeler.ModelerAlgorithm import Algorithm
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FORMULA = 'FORMULA'
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NUMBER = 'NUMBER'
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RESULT = 'RESULT'
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AVAILABLE_VARIABLES = 10
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class CalculatorModelerAlgorithm(GeoAlgorithm):
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def defineCharacteristics(self):
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self.showInModeler = True
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self.showInToolbox = False
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self.name = self.tr('Calculator', 'CalculatorModelerAlgorithm')
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self.group = self.tr('Modeler-only tools', 'CalculatorModelerAlgorithm')
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self.addParameter(ParameterString(FORMULA,
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self.tr('Formula', 'CalculatorModelerAlgorithm'), ''))
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for i in range(AVAILABLE_VARIABLES):
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self.addParameter(ParameterNumber(NUMBER
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+ unicode(i), 'dummy'))
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self.addOutput(OutputNumber(RESULT,
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self.tr('Result', 'CalculatorModelerAlgorithm')))
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def processAlgorithm(self, progress):
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formula = self.getParameterValue(FORMULA)
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for i in range(AVAILABLE_VARIABLES):
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name = NUMBER + unicode(i)
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num = self.getParameterValue(name)
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formula = formula.replace(chr(97 + i), unicode(num))
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try:
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result = eval(formula)
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self.setOutputValue(RESULT, result)
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except:
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raise GeoAlgorithmExecutionException(
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self.tr('Wrong formula: %s', 'CalculatorModelerAlgorithm') % formula)
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def getCustomModelerParametersDialog(self, modelAlg, algName=None):
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return CalculatorModelerParametersDialog(self, modelAlg, algName)
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class CalculatorModelerParametersDialog(ModelerParametersDialog):
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def setupUi(self):
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self.valueItems = {}
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self.dependentItems = {}
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self.resize(650, 450)
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self.buttonBox = QDialogButtonBox()
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self.buttonBox.setOrientation(Qt.Horizontal)
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self.buttonBox.setStandardButtons(QDialogButtonBox.Cancel
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| QDialogButtonBox.Ok)
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self.infoText = QTextEdit()
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numbers = self.getAvailableValuesOfType(ParameterNumber, OutputNumber)
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text = self.tr('You can refer to model values in your formula, using '
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'single-letter variables, as follows:\n', 'CalculatorModelerParametersDialog')
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ichar = 97
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if numbers:
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for number in numbers:
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text += chr(ichar) + '->' + self.resolveValueDescription(number) + '\n'
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ichar += 1
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else:
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text += self.tr('\n - No numerical variables are available.', 'CalculatorModelerParametersDialog')
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self.infoText.setText(text)
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self.infoText.setEnabled(False)
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self.formulaText = QLineEdit()
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if hasattr(self.formulaText, 'setPlaceholderText'):
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self.formulaText.setPlaceholderText(self.tr('[Enter your formula here]', 'CalculatorModelerParametersDialog'))
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if self._algName is not None:
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alg = self.model.algs[self._algName]
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self.formulaText.setText(alg.params[FORMULA])
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self.setWindowTitle(self.tr('Calculator', 'CalculatorModelerParametersDialog'))
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self.verticalLayout = QVBoxLayout()
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self.verticalLayout.setSpacing(2)
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self.verticalLayout.setMargin(0)
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self.verticalLayout.addWidget(self.infoText)
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self.verticalLayout.addWidget(self.formulaText)
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self.verticalLayout.addWidget(self.buttonBox)
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self.setLayout(self.verticalLayout)
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QObject.connect(self.buttonBox, SIGNAL('accepted()'), self.okPressed)
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QObject.connect(self.buttonBox, SIGNAL('rejected()'), self.cancelPressed)
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QMetaObject.connectSlotsByName(self)
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def createAlgorithm(self):
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alg = Algorithm('modelertools:calculator')
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alg.setName(self.model)
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alg.description = self.tr('Calculator', 'CalculatorModelerParametersDialog')
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formula = self.formulaText.text()
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alg.params[FORMULA] = formula
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for i in xrange(AVAILABLE_VARIABLES):
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paramname = NUMBER + unicode(i)
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alg.params[paramname] = None
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numbers = self.getAvailableValuesOfType(ParameterNumber, OutputNumber)
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used = []
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for i in range(len(numbers)):
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if unicode(chr(i + 97)) in formula:
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used.append(numbers[i])
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for i, variable in enumerate(used):
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paramname = NUMBER + unicode(i)
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alg.params[paramname] = variable
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# TODO check formula is correct
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return alg
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