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"""
***************************************************************************
nearblack.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 (
QgsRasterFileWriter,
QgsProcessingException,
QgsProcessingParameterDefinition,
QgsProcessingParameterRasterLayer,
QgsProcessingParameterBoolean,
QgsProcessingParameterNumber,
QgsProcessingParameterString,
QgsProcessingParameterRasterDestination,
)
from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
from processing.algs.gdal.GdalUtils import GdalUtils
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
class nearblack(GdalAlgorithm):
INPUT = "INPUT"
NEAR = "NEAR"
WHITE = "WHITE"
OPTIONS = "OPTIONS"
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(
QgsProcessingParameterNumber(
self.NEAR,
self.tr("How far from black (white)"),
type=QgsProcessingParameterNumber.Type.Integer,
minValue=0,
defaultValue=15,
)
)
self.addParameter(
QgsProcessingParameterBoolean(
self.WHITE,
self.tr("Search for nearly white pixels instead of nearly black"),
defaultValue=False,
)
)
options_param = QgsProcessingParameterString(
self.OPTIONS,
self.tr("Additional creation options"),
defaultValue="",
optional=True,
)
options_param.setFlags(
options_param.flags() | QgsProcessingParameterDefinition.Flag.FlagAdvanced
)
options_param.setMetadata({"widget_wrapper": {"widget_type": "rasteroptions"}})
self.addParameter(options_param)
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(
QgsProcessingParameterRasterDestination(self.OUTPUT, self.tr("Nearblack"))
)
def name(self):
return "nearblack"
def displayName(self):
return self.tr("Near black")
def group(self):
return self.tr("Raster analysis")
def groupId(self):
return "rasteranalysis"
def icon(self):
return QIcon(os.path.join(pluginPath, "images", "gdaltools", "nearblack.png"))
def commandName(self):
return "nearblack"
def getConsoleCommands(self, parameters, context, feedback, executing=True):
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)
out = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
self.setOutputValue(self.OUTPUT, out)
output_format = QgsRasterFileWriter.driverForExtension(os.path.splitext(out)[1])
if not output_format:
raise QgsProcessingException(self.tr("Output format is invalid"))
arguments = [
input_details.connection_string,
"-of",
output_format,
"-o",
out,
"-near",
str(self.parameterAsInt(parameters, self.NEAR, context)),
]
if self.parameterAsBoolean(parameters, self.WHITE, context):
arguments.append("-white")
if input_details.credential_options:
arguments.extend(input_details.credential_options_as_arguments())
options = self.parameterAsString(parameters, self.OPTIONS, context)
if options:
arguments.extend(GdalUtils.parseCreationOptions(options))
if self.EXTRA in parameters and parameters[self.EXTRA] not in (None, ""):
extra = self.parameterAsString(parameters, self.EXTRA, context)
arguments.append(extra)
return [self.commandName(), GdalUtils.escapeAndJoin(arguments)]
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