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53 lines
2.2 KiB
Python
53 lines
2.2 KiB
Python
"""
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***************************************************************************
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r_drain.py
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----------
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Date : February 2016
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Copyright : (C) 2016 by Médéric Ribreux
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Email : medspx at medspx dot fr
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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__ = "Médéric Ribreux"
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__date__ = "February 2016"
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__copyright__ = "(C) 2016, Médéric Ribreux"
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from qgis.PyQt.QtCore import QCoreApplication
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def checkParameterValuesBeforeExecuting(alg, parameters, context):
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"""Verify if we have the right parameters"""
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# start_coordinates and start_points are mutually exclusives
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if alg.parameterAsString(
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parameters, "start_coordinates", context
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) and alg.parameterAsVectorLayer(parameters, "start_points", context):
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return False, QCoreApplication.translate(
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"GrassAlgorithmExt",
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"You need to set either start coordinates OR a start points vector layer!",
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)
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# You need to set at least one parameter
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if not alg.parameterAsString(
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parameters, "start_coordinates", context
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) and not alg.parameterAsVectorLayer(parameters, "start_points", context):
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return False, QCoreApplication.translate(
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"GrassAlgorithmExt",
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"You need to set either start coordinates OR a start points vector layer!",
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)
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paramscore = [
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f for f in ["-c", "-a", "-n"] if alg.parameterAsBoolean(parameters, f, context)
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]
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if len(paramscore) > 1:
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return False, QCoreApplication.translate(
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"GrassAlgorithmExt", "-c, -a, -n parameters are mutually exclusive!"
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)
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return True, None
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