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"""
***************************************************************************
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"
import os
from qgis.PyQt.QtGui import QIcon
from qgis.core import (
QgsProcessing,
QgsProcessingException,
QgsProcessingParameterDefinition,
QgsProcessingParameterRasterLayer,
QgsProcessingParameterBand,
QgsProcessingParameterString,
QgsProcessingParameterBoolean,
QgsProcessingParameterVectorDestination,
)
from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
from processing.tools.system import isWindows
from processing.algs.gdal.GdalUtils import GdalUtils
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
class polygonize(GdalAlgorithm):
INPUT = "INPUT"
BAND = "BAND"
FIELD = "FIELD"
EIGHT_CONNECTEDNESS = "EIGHT_CONNECTEDNESS"
EXTRA = "EXTRA"
OUTPUT = "OUTPUT"
def __init__(self):
super().__init__()
def initAlgorithm(self, config=None):
self.addParameter(
QgsProcessingParameterRasterLayer(self.INPUT, self.tr("Input layer"))
)
self.addParameter(
QgsProcessingParameterBand(
self.BAND,
self.tr("Band number"),
1,
parentLayerParameterName=self.INPUT,
)
)
self.addParameter(
QgsProcessingParameterString(
self.FIELD, self.tr("Name of the field to create"), defaultValue="DN"
)
)
self.addParameter(
QgsProcessingParameterBoolean(
self.EIGHT_CONNECTEDNESS,
self.tr("Use 8-connectedness"),
defaultValue=False,
)
)
extra_param = QgsProcessingParameterString(
self.EXTRA,
self.tr("Additional command-line parameters"),
defaultValue=None,
optional=True,
)
extra_param.setFlags(
extra_param.flags() | QgsProcessingParameterDefinition.Flag.FlagAdvanced
)
self.addParameter(extra_param)
self.addParameter(
QgsProcessingParameterVectorDestination(
self.OUTPUT,
self.tr("Vectorized"),
QgsProcessing.SourceType.TypeVectorPolygon,
)
)
def name(self):
return "polygonize"
def displayName(self):
return self.tr("Polygonize (raster to vector)")
def group(self):
return self.tr("Raster conversion")
def groupId(self):
return "rasterconversion"
def icon(self):
return QIcon(os.path.join(pluginPath, "images", "gdaltools", "polygonize.png"))
def commandName(self):
return "gdal_polygonize"
def getConsoleCommands(self, parameters, context, feedback, executing=True):
arguments = []
if self.parameterAsBoolean(parameters, self.EIGHT_CONNECTEDNESS, context):
arguments.append("-8")
if self.EXTRA in parameters and parameters[self.EXTRA] not in (None, ""):
extra = self.parameterAsString(parameters, self.EXTRA, context)
arguments.append(extra)
inLayer = self.parameterAsRasterLayer(parameters, self.INPUT, context)
if inLayer is None:
raise QgsProcessingException(
self.invalidRasterError(parameters, self.INPUT)
)
input_details = GdalUtils.gdal_connection_details_from_layer(inLayer)
arguments.append(input_details.connection_string)
arguments.append("-b")
arguments.append(str(self.parameterAsInt(parameters, self.BAND, context)))
outFile = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
self.setOutputValue(self.OUTPUT, outFile)
output_details = GdalUtils.gdal_connection_details_from_uri(outFile, context)
if output_details.format:
arguments.append(f"-f {output_details.format}")
arguments.append(output_details.connection_string)
# Output layer name
arguments.append(
os.path.basename(os.path.splitext(output_details.connection_string)[0])
)
arguments.append(self.parameterAsString(parameters, self.FIELD, context))
if input_details.credential_options:
arguments.extend(input_details.credential_options_as_arguments())
return [
self.commandName() + (".bat" if isWindows() else ".py"),
GdalUtils.escapeAndJoin(arguments),
]
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