Add r.colors algorithm

Author: Médéric RIBREUX

python/plugins/processing/algs/grass7/description/r.colors.txt

@@ -0,0 +1,16 @@
+r.colors
+Creates/modifies the color table associated with a raster map.
+Raster (r.*)
+ParameterMultipleInput|map|Name of raster maps(s)|3|False
+ParameterSelection|color|Name of color table|not selected;aspect;aspectcolr;bcyr;bgyr;blues;byg;byr;celsius;corine;curvature;differences;elevation;etopo2;evi;fahrenheit;gdd;greens;grey;grey.eq;grey.log;grey1.0;grey255;gyr;haxby;kelvin;ndvi;ndwi;oranges;population;population_dens;precipitation;precipitation_daily;precipitation_monthly;rainbow;ramp;random;reds;rstcurv;ryb;ryg;sepia;slope;srtm;srtm_plus;terrain;wave|0|False|True
+ParameterString|rules_txt|Color rules|None|True|True
+ParameterFile|rules|Color rules file|True
+ParameterRaster|raster|Raster map from which to copy color table|True
+ParameterBoolean|-r|Remove existing color table|False
+ParameterBoolean|-w|Only write new color table if it does not already exist|False
+ParameterBoolean|-n|Invert colors|False
+ParameterBoolean|-g|Logarithmic scaling|False
+ParameterBoolean|-a|Logarithmic-absolute scaling|False
+ParameterBoolean|-e|Histogram equalization|False
+OutputDirectory|output_dir|Output Directory
+

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

@@ -0,0 +1,99 @@
+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    r_colors.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__ = '$Format:%H$'
+
+import os
+
+
+def checkParameterValuesBeforeExecuting(alg):
+    """ Verify if we have the right parameters """
+    if alg.getParameterValue(u'rules_txt') and alg.getParameterValue(u'rules'):
+        return alg.tr("You need to set either inline rules or a rules file !")
+
+    return None
+
+
+def processInputs(alg):
+    # import all rasters with their color tables (and their bands)
+    # We need to import all the bands and color tables of the input rasters
+    rasters = alg.getParameterValue('map').split(',')
+    for raster in rasters:
+        if raster in alg.exportedLayers.keys():
+            continue
+
+        alg.setSessionProjectionFromLayer(raster, alg.commands)
+        destFilename = alg.getTempFilename()
+        alg.exportedLayers[raster] = destFilename
+        command = 'r.in.gdal input={} output={} --overwrite -o'.format(raster, destFilename)
+        alg.commands.append(command)
+
+    alg.setSessionProjectionFromProject(alg.commands)
+
+    region = unicode(alg.getParameterValue(alg.GRASS_REGION_EXTENT_PARAMETER))
+    regionCoords = region.split(',')
+    command = 'g.region'
+    command += ' -a'
+    command += ' n=' + unicode(regionCoords[3])
+    command += ' s=' + unicode(regionCoords[2])
+    command += ' e=' + unicode(regionCoords[1])
+    command += ' w=' + unicode(regionCoords[0])
+    cellsize = alg.getParameterValue(alg.GRASS_REGION_CELLSIZE_PARAMETER)
+    if cellsize:
+        command += ' res=' + unicode(cellsize)
+    else:
+        command += ' res=' + unicode(alg.getDefaultCellsize())
+    alignToResolution = alg.getParameterValue(alg.GRASS_REGION_ALIGN_TO_RESOLUTION)
+    if alignToResolution:
+        command += ' -a'
+    alg.commands.append(command)
+
+
+def processCommand(alg):
+    # remove output before processCommand
+    output = alg.getOutputFromName('output_dir')
+    alg.removeOutputFromName('output_dir')
+    color = alg.getParameterFromName('color')
+    if color.value == 0:
+        alg.parameters.remove(color)
+
+    # TODO Handle rules
+    alg.processCommand()
+
+    # re-add the previous output
+    alg.addOutput(output)
+
+
+def processOutputs(alg):
+    # Export all rasters with their color tables (and their bands)
+    rasters = [alg.exportedLayers[f] for f in alg.getParameterValue('map').split(',')]
+    output_dir = alg.getOutputValue('output_dir')
+    for raster in rasters:
+        command = u"r.out.gdal createopt=\"TFW=YES,COMPRESS=LZW\" input={} output=\"{}\" --overwrite".format(
+            raster,
+            os.path.join(output_dir, raster + '.tif')
+        )
+        alg.commands.append(command)
+        alg.outputCommands.append(command)