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Add r.shade algorithm

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Médéric RIBREUX
Médéric RIBREUX committed Feb 27, 2016
1 parent 4863504 commit 717687b2ceeb6edfc006d23d4e476a001e6b298a
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r.shade
Drapes a color raster over an shaded relief or aspect map.
Raster (r.*)
ParameterRaster|shade|Name of shaded relief or aspect raster map|False
ParameterRaster|color|Name of raster to drape over relief raster map|False
ParameterNumber|brighten|Percent to brighten|-99|99|0|True
ParameterString|bgcolor|Color to use instead of NULL values. Either a standard color name, R:G:B triplet, or "none"|None|False|True
*ParameterBoolean|-c|Use colors from color tables for NULL values|False
OutputRaster|output|Shaded
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# -*- coding: utf-8 -*-

"""
***************************************************************************
r_shade.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 """
if alg.getParameterValue('brighten') and alg.getParameterValue('bgcolor'):
return alg.tr("You need to set either a brighten percentage or a NULL color !")
return None


def processInputs(alg):
# We need to import all the bands and color tables of the input rasters
shade = alg.getParameterValue('shade')
color = alg.getParameterValue('color')
if color in alg.exportedLayers.keys():
return

for raster, method in (shade, 'r.external'), (color, 'r.in.gdal'):
alg.setSessionProjectionFromLayer(raster, alg.commands)

destFilename = alg.getTempFilename()
alg.exportedLayers[raster] = destFilename
command = '{} input={} output={} --overwrite -o'.format(method, 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 processOutputs(alg):
# Keep color table ?
output = alg.getOutputValue(u'output')
command = u"r.out.gdal -t createopt=\"TFW=YES,COMPRESS=LZW\" input={} output=\"{}\" --overwrite".format(
alg.exportedLayers[output],
output
)
alg.commands.append(command)
alg.outputCommands.append(command)

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