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Fix r.drain algorithm (fixes Redmine #13003)
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Médéric RIBREUX committed Feb 28, 2016
1 parent 36da688 commit 960f3a9
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7 changes: 5 additions & 2 deletions python/plugins/processing/algs/grass7/description/r.drain.txt
Expand Up @@ -2,9 +2,12 @@ r.drain
Traces a flow through an elevation model on a raster map.
Raster (r.*)
ParameterString|start_coordinates|Map coordinates of starting point(s) (E,N)|(0,0)
ParameterMultipleInput|start_points|Vector layer(s) containing starting point(s)|0|True
ParameterRaster|direction|Name of input movement direction map associated with the cost surface|True
ParameterString|start_coordinates|Map coordinates of starting point(s) (E,N)|0.0,0.0|False|True
ParameterVector|start_points|Vector layer containing starting point(s)|0|True
ParameterBoolean|-c|Copy input cell values on output|False
ParameterBoolean|-a|Accumulate input values along the path|False
ParameterBoolean|-n|Count cell numbers along the path|False
ParameterBoolean|-d|The input raster map is a cost surface (direction surface must also be specified)|False
OutputRaster|output|Least cost path
40 changes: 40 additions & 0 deletions python/plugins/processing/algs/grass7/ext/
@@ -0,0 +1,40 @@
# -*- coding: utf-8 -*-

Date : February 2016
Copyright : (C) 2016 by Médéric Ribreux
Email : medspx at medspx dot fr
* *
* 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__ = 'Médéric Ribreux'
__date__ = 'February 2016'
__copyright__ = '(C) 2016, Médéric Ribreux'

# This will get replaced with a git SHA1 when you do a git archive

__revision__ = '$Format:%H$'

import os

def checkParameterValuesBeforeExecuting(alg):
""" Verify if we have the right parameters """
if alg.getParameterValue('start_coordinates') and alg.getParameterValue('start_points'):
return"You need to set either start coordinates OR a start points vector layer !")

parameters = [alg.getParameterValue(f) for f in ['-c', '-a', '-n']]
paramscore = [f for f in parameters if f]
if len(paramscore) > 1:
return"-c, -a, -n parameters are mutually exclusive !")
return None

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