QGIS/python/plugins/processing/gdal/polygonize.py

# -*- coding: utf-8 -*-

"""
***************************************************************************
    polygonize.py
    ---------------------
    Date                 : August 2012
    Copyright            : (C) 2012 by Victor Olaya
    Email                : volayaf 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__ = 'Victor Olaya'
__date__ = 'August 2012'
__copyright__ = '(C) 2012, Victor Olaya'

# This will get replaced with a git SHA1 when you do a git archive

__revision__ = '$Format:%H$'

import os
from PyQt4 import QtGui, QtCore

from processing.core.GeoAlgorithm import GeoAlgorithm

from processing.parameters.ParameterRaster import ParameterRaster
from processing.parameters.ParameterString import ParameterString
from processing.outputs.OutputVector import OutputVector

from processing.tools.system import *

from processing.gdal.GdalUtils import GdalUtils


class polygonize(GeoAlgorithm):

    INPUT = 'INPUT'
    OUTPUT = 'OUTPUT'
    FIELD = 'FIELD'

    def getIcon(self):
        filepath = os.path.dirname(__file__) + '/icons/polygonize.png'
        return QtGui.QIcon(filepath)

    def defineCharacteristics(self):
        self.name = 'Polygonize (raster to vector)'
        self.group = '[GDAL] Conversion'
        self.addParameter(ParameterRaster(polygonize.INPUT, 'Input layer',
                          False))
        self.addParameter(ParameterString(polygonize.FIELD, 'Output field name'
                          , 'DN'))
        self.addOutput(OutputVector(polygonize.OUTPUT, 'Output layer'))

    def processAlgorithm(self, progress):
        arguments = []
        arguments.append(self.getParameterValue(polygonize.INPUT))
        arguments.append('-f')
        arguments.append('ESRI Shapefile')
        output = self.getOutputValue(polygonize.OUTPUT)
        arguments.append(output)
        arguments.append(QtCore.QFileInfo(output).baseName())
        arguments.append(self.getParameterValue(polygonize.FIELD))

        commands = []
        if isWindows():
            commands = ['cmd.exe', '/C ', 'gdal_polygonize.bat',
                        GdalUtils.escapeAndJoin(arguments)]
        else:
            commands = ['gdal_polygonize.py',
                        GdalUtils.escapeAndJoin(arguments)]

        GdalUtils.runGdal(commands, progress)