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[processing] add GDAL Contour algorithm
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# -*- coding: utf-8 -*- | ||
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""" | ||
*************************************************************************** | ||
contour.py | ||
--------------------- | ||
Date : September 2013 | ||
Copyright : (C) 2013 by Alexander Bruy | ||
Email : alexander 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__ = 'September 2013' | ||
__copyright__ = '(C) 2013, Alexander Bruy' | ||
# This will get replaced with a git SHA1 when you do a git archive | ||
__revision__ = '$Format:%H$' | ||
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import os | ||
from PyQt4 import QtGui | ||
from qgis.core import * | ||
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from processing.core.GeoAlgorithm import GeoAlgorithm | ||
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from processing.parameters.ParameterRaster import ParameterRaster | ||
from processing.parameters.ParameterNumber import ParameterNumber | ||
from processing.parameters.ParameterString import ParameterString | ||
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from processing.outputs.OutputVector import OutputVector | ||
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from processing.gdal.GdalUtils import GdalUtils | ||
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class contour(GeoAlgorithm): | ||
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INPUT_RASTER = "INPUT_RASTER" | ||
OUTPUT_VECTOR = "OUTPUT_VECTOR" | ||
INTERVAL = "INTERVAL" | ||
FIELD_NAME = "FIELD_NAME" | ||
EXTRA = "EXTRA" | ||
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def getIcon(self): | ||
filepath = os.path.dirname(__file__) + "/icons/contour.png" | ||
return QtGui.QIcon(filepath) | ||
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def defineCharacteristics(self): | ||
self.name = "Contour" | ||
self.group = "[GDAL] Extraction" | ||
self.addParameter(ParameterRaster(self.INPUT_RASTER, "Input layer", False)) | ||
self.addParameter(ParameterNumber(self.INTERVAL, "Interval between contour lines", 0.0, 99999999.999999, 10.0)) | ||
self.addParameter(ParameterString(self.FIELD_NAME, "Attribute name (if not provided, no elecation attribute is attached)", "ELEV", optional=True)) | ||
self.addParameter(ParameterString(self.EXTRA, "Additional creation parameters", "")) | ||
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self.addOutput(OutputVector(self.OUTPUT_VECTOR, "Output file for contour lines (vector)")) | ||
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def processAlgorithm(self, progress): | ||
interval = str(self.getParameterValue(self.INTERVAL)) | ||
fieldName = str(self.getParameterValue(self.FIELD_NAME)) | ||
extra = str(self.getParameterValue(self.EXTRA)) | ||
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arguments = [] | ||
if len(fieldName) > 0: | ||
arguments.append("-a") | ||
arguments.append(fieldName) | ||
arguments.append("-i") | ||
arguments.append(interval) | ||
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if len(extra) > 0: | ||
arguments.append(extra) | ||
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arguments.append(self.getParameterValue(self.INPUT_RASTER)) | ||
arguments.append(self.getOutputValue(self.OUTPUT_VECTOR)) | ||
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GdalUtils.runGdal(["gdal_contour", GdalUtils.escapeAndJoin(arguments)], progress) |