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149 lines
5.0 KiB
Python
149 lines
5.0 KiB
Python
"""
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***************************************************************************
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offsetcurve.py
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---------------------
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Date : Janaury 2015
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Copyright : (C) 2015 by Giovanni Manghi
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Email : giovanni dot manghi at naturalgis dot pt
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = "Giovanni Manghi"
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__date__ = "January 2015"
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__copyright__ = "(C) 2015, Giovanni Manghi"
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from qgis.core import (
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QgsProcessing,
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QgsProcessingParameterDefinition,
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QgsProcessingParameterDistance,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterString,
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QgsProcessingException,
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QgsProcessingParameterVectorDestination,
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)
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from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
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from processing.algs.gdal.GdalUtils import GdalUtils
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class OffsetCurve(GdalAlgorithm):
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INPUT = "INPUT"
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GEOMETRY = "GEOMETRY"
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DISTANCE = "DISTANCE"
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OPTIONS = "OPTIONS"
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OUTPUT = "OUTPUT"
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def __init__(self):
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super().__init__()
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def initAlgorithm(self, config=None):
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self.addParameter(
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QgsProcessingParameterFeatureSource(
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self.INPUT,
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self.tr("Input layer"),
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[QgsProcessing.SourceType.TypeVectorLine],
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)
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)
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self.addParameter(
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QgsProcessingParameterString(
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self.GEOMETRY, self.tr("Geometry column name"), defaultValue="geometry"
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)
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)
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self.addParameter(
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QgsProcessingParameterDistance(
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self.DISTANCE,
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self.tr(
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"Offset distance (left-sided: positive, right-sided: negative)"
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),
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parentParameterName=self.INPUT,
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defaultValue=10,
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)
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)
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options_param = QgsProcessingParameterString(
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self.OPTIONS,
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self.tr("Additional creation options"),
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defaultValue="",
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optional=True,
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)
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options_param.setFlags(
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options_param.flags() | QgsProcessingParameterDefinition.Flag.FlagAdvanced
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)
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self.addParameter(options_param)
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self.addParameter(
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QgsProcessingParameterVectorDestination(
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self.OUTPUT,
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self.tr("Offset curve"),
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QgsProcessing.SourceType.TypeVectorLine,
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)
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)
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def name(self):
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return "offsetcurve"
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def displayName(self):
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return self.tr("Offset curve")
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def group(self):
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return self.tr("Vector geoprocessing")
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def groupId(self):
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return "vectorgeoprocessing"
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def commandName(self):
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return "ogr2ogr"
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def getConsoleCommands(self, parameters, context, feedback, executing=True):
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source = self.parameterAsSource(parameters, self.INPUT, context)
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if source is None:
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raise QgsProcessingException(
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self.invalidSourceError(parameters, self.INPUT)
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)
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fields = source.fields()
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input_details = self.getOgrCompatibleSource(
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self.INPUT, parameters, context, feedback, executing
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)
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geometry = self.parameterAsString(parameters, self.GEOMETRY, context)
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distance = self.parameterAsDouble(parameters, self.DISTANCE, context)
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options = self.parameterAsString(parameters, self.OPTIONS, context)
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outFile = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
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self.setOutputValue(self.OUTPUT, outFile)
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output_details = GdalUtils.gdal_connection_details_from_uri(outFile, context)
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other_fields_exist = any(True for f in fields if f.name() != geometry)
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other_fields = ",*" if other_fields_exist else ""
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arguments = [
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output_details.connection_string,
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input_details.connection_string,
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"-dialect",
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"sqlite",
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"-sql",
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]
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sql = f'SELECT ST_OffsetCurve({geometry}, {distance}) AS {geometry}{other_fields} FROM "{input_details.layer_name}"'
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arguments.append(sql)
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if input_details.open_options:
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arguments.extend(input_details.open_options_as_arguments())
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if input_details.credential_options:
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arguments.extend(input_details.credential_options_as_arguments())
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if options:
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arguments.append(options)
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if output_details.format:
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arguments.append(f"-f {output_details.format}")
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return ["ogr2ogr", GdalUtils.escapeAndJoin(arguments)]
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