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# -*- coding: utf-8 -*-
"""
***************************************************************************
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. *
* *
***************************************************************************
"""
__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__ = '$Format:%H$'
import os
from PyQt4 import QtGui
from qgis.core import *
from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
from processing.parameters.ParameterRaster import ParameterRaster
from processing.parameters.ParameterNumber import ParameterNumber
from processing.parameters.ParameterString import ParameterString
from processing.outputs.OutputVector import OutputVector
from processing.algs.gdal.GdalUtils import GdalUtils
class contour(GdalAlgorithm):
INPUT_RASTER = 'INPUT_RASTER'
OUTPUT_VECTOR = 'OUTPUT_VECTOR'
INTERVAL = 'INTERVAL'
FIELD_NAME = 'FIELD_NAME'
EXTRA = 'EXTRA'
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 set, no elevation attribute is attached)',
'ELEV', optional=True))
self.addParameter(ParameterString(self.EXTRA,
'Additional creation parameters', '', optional=True))
self.addOutput(OutputVector(self.OUTPUT_VECTOR,
'Output file for contour lines (vector)'))
def processAlgorithm(self, progress):
interval = str(self.getParameterValue(self.INTERVAL))
fieldName = str(self.getParameterValue(self.FIELD_NAME))
extra = str(self.getParameterValue(self.EXTRA))
arguments = []
if len(fieldName) > 0:
arguments.append('-a')
arguments.append(fieldName)
arguments.append('-i')
arguments.append(interval)
if len(extra) > 0:
arguments.append(extra)
arguments.append(self.getParameterValue(self.INPUT_RASTER))
arguments.append(self.getOutputValue(self.OUTPUT_VECTOR))
GdalUtils.runGdal(['gdal_contour',
GdalUtils.escapeAndJoin(arguments)], progress)
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