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Merge pull request #3885 from alexbruy/processing-relief
[processing] add missed functionality from Raster Terrain Analysis plugin
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# -*- coding: utf-8 -*- | ||
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""" | ||
*************************************************************************** | ||
Relief.py | ||
--------------------- | ||
Date : December 2016 | ||
Copyright : (C) 2016 by Alexander Bruy | ||
Email : alexander dot bruy at gmail dot com | ||
*************************************************************************** | ||
* * | ||
* 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. * | ||
* * | ||
*************************************************************************** | ||
""" | ||
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__author__ = 'Alexander Bruy' | ||
__date__ = 'December 2016' | ||
__copyright__ = '(C) 2016, Alexander Bruy' | ||
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# This will get replaced with a git SHA1 when you do a git archive | ||
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__revision__ = '$Format:%H$' | ||
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import os | ||
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from qgis.PyQt.QtGui import QIcon, QColor | ||
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from qgis.analysis import QgsRelief | ||
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from processing.core.GeoAlgorithm import GeoAlgorithm | ||
from processing.core.parameters import (Parameter, | ||
ParameterRaster, | ||
ParameterNumber, | ||
ParameterBoolean, | ||
_splitParameterOptions) | ||
from processing.core.outputs import OutputRaster, OutputTable | ||
from processing.tools import raster | ||
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0] | ||
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class Relief(GeoAlgorithm): | ||
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INPUT_LAYER = 'INPUT_LAYER' | ||
Z_FACTOR = 'Z_FACTOR' | ||
AUTO_COLORS = 'AUTO_COLORS' | ||
COLORS = 'COLORS' | ||
OUTPUT_LAYER = 'OUTPUT_LAYER' | ||
FREQUENCY_DISTRIBUTION = 'FREQUENCY_DISTRIBUTION' | ||
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def getIcon(self): | ||
return QIcon(os.path.join(pluginPath, 'images', 'dem.png')) | ||
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def defineCharacteristics(self): | ||
self.name, self.i18n_name = self.trAlgorithm('Relief') | ||
self.group, self.i18n_group = self.trAlgorithm('Raster terrain analysis') | ||
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class ParameterReliefColors(Parameter): | ||
default_metadata = { | ||
'widget_wrapper': 'processing.algs.qgis.ui.ReliefColorsWidget.ReliefColorsWidgetWrapper' | ||
} | ||
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def __init__(self, name='', description='', parent=None, optional=True): | ||
Parameter.__init__(self, name, description, None, optional) | ||
self.parent = parent | ||
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def setValue(self, value): | ||
if value is None: | ||
if not self.optional: | ||
return False | ||
self.value = None | ||
return True | ||
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if value == '': | ||
if not self.optional: | ||
return False | ||
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if isinstance(value, str): | ||
self.value = value if value != '' else None | ||
else: | ||
self.value = ParameterReliefColors.colorsToString(value) | ||
return True | ||
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def getValueAsCommandLineParameter(self): | ||
return '"{}"'.format(self.value) | ||
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def getAsScriptCode(self): | ||
param_type = '' | ||
param_type += 'relief colors ' | ||
return '##' + self.name + '=' + param_type | ||
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@classmethod | ||
def fromScriptCode(self, line): | ||
isOptional, name, definition = _splitParameterOptions(line) | ||
descName = _createDescriptiveName(name) | ||
parent = definition.lower().strip()[len('relief colors') + 1:] | ||
return ParameterReliefColors(name, description, parent) | ||
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@staticmethod | ||
def colorsToString(colors): | ||
s = '' | ||
for c in colors: | ||
s += '{:f}, {:f}, {:d}, {:d}, {:d};'.format(c[0], | ||
c[1], | ||
c[2], | ||
c[3], | ||
c[4]) | ||
return s[:-1] | ||
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self.addParameter(ParameterRaster(self.INPUT_LAYER, | ||
self.tr('Elevation layer'))) | ||
self.addParameter(ParameterNumber(self.Z_FACTOR, | ||
self.tr('Z factor'), | ||
1.0, 999999.99, 1.0)) | ||
self.addParameter(ParameterBoolean(self.AUTO_COLORS, | ||
self.tr('Generate relief classes automaticaly'), | ||
False)) | ||
self.addParameter(ParameterReliefColors(self.COLORS, | ||
self.tr('Relief colors'), | ||
self.INPUT_LAYER, | ||
True)) | ||
self.addOutput(OutputRaster(self.OUTPUT_LAYER, | ||
self.tr('Relief'))) | ||
self.addOutput(OutputTable(self.FREQUENCY_DISTRIBUTION, | ||
self.tr('Frequency distribution'))) | ||
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def processAlgorithm(self, progress): | ||
inputFile = self.getParameterValue(self.INPUT_LAYER) | ||
zFactor = self.getParameterValue(self.Z_FACTOR) | ||
automaticColors = self.getParameterValue(self.AUTO_COLORS) | ||
colors = self.getParameterValue(self.COLORS) | ||
outputFile = self.getOutputValue(self.OUTPUT_LAYER) | ||
frequencyDistribution = self.getOutputValue(self.FREQUENCY_DISTRIBUTION) | ||
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outputFormat = raster.formatShortNameFromFileName(outputFile) | ||
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relief = QgsRelief(inputFile, outputFile, outputFormat) | ||
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if automaticColors: | ||
reliefColors = relief.calculateOptimizedReliefClasses() | ||
else: | ||
if colors is None: | ||
raise GeoAlgorithmExecutionException( | ||
self.tr('Specify relief colors or activate "Generate relief classes automaticaly" option.')) | ||
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reliefColors = [] | ||
for c in colors.split(';'): | ||
v = c.split(',') | ||
color = QgsRelief.ReliefColor(QColor(int(v[2]), int(v[3]), int(v[4])), | ||
float(v[0]), | ||
float(v[1])) | ||
reliefColors.append(color) | ||
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relief.setReliefColors(reliefColors) | ||
relief.setZFactor(zFactor) | ||
relief.exportFrequencyDistributionToCsv(frequencyDistribution) | ||
relief.processRaster(None) |
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