Add r.resamp.filter.txt algorithm

Author: Médéric RIBREUX

python/plugins/processing/algs/grass7/description/r.resamp.filter.txt

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+r.resamp.filter
+Resamples raster map layers using an analytic kernel.
+Raster (r.*)
+ParameterRaster|input|Input raster layer|False
+ParameterString|filter|Filter kernel(s) (comma separated list if multiple). Options: box, bartlett, gauss, normal, hermite, sinc, lanczos1, lanczos2, lanczos3, hann, hamming, blackman|None|False
+ParameterString|radius|Filter radius for each filter (comma separated list of float if multiple)|None|False|True
+ParameterString|x_radius|Filter radius (horizontal) for each filter (comma separated list of float if multiple)|None|False|True
+ParameterString|y_radius|Filter radius (vertical) for each filter (comma separated list of float if multiple)|None|False|True
+*ParameterBoolean|-n|Propagate NULLs|False|True
+OutputRaster|output|Resampled Filter

python/plugins/processing/algs/grass7/ext/r_resamp_filter.py

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+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    r_resamp_filter.py
+    ------------------
+    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__ = '$Format:%H$'
+
+
+def checkParameterValuesBeforeExecuting(alg):
+    """ Verify if we have the right parameters """
+    radius = alg.getParameterValue(u'radius')
+    x_radius = alg.getParameterValue(u'x_radius')
+    y_radius = alg.getParameterValue(u'y_radius')
+
+    if (not radius and not x_radius and not y_radius) or (radius and (x_radius or y_radius)):
+        return alg.tr("You need to set either radius or x_radius and y_radius !")
+    elif (x_radius and not y_radius) or (y_radius and not x_radius):
+        return alg.tr("You need to set x_radius and y_radius !")
+    return None