mirror of
https://github.com/qgis/QGIS.git
synced 2025-10-26 00:04:03 -04:00
121 lines
5.1 KiB
Python
121 lines
5.1 KiB
Python
"""
|
|
***************************************************************************
|
|
offsetcurve.py
|
|
---------------------
|
|
Date : Janaury 2015
|
|
Copyright : (C) 2015 by Giovanni Manghi
|
|
Email : giovanni dot manghi at naturalgis dot pt
|
|
***************************************************************************
|
|
* *
|
|
* 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__ = 'Giovanni Manghi'
|
|
__date__ = 'January 2015'
|
|
__copyright__ = '(C) 2015, Giovanni Manghi'
|
|
|
|
from qgis.core import (QgsProcessing,
|
|
QgsProcessingParameterDefinition,
|
|
QgsProcessingParameterDistance,
|
|
QgsProcessingParameterFeatureSource,
|
|
QgsProcessingParameterString,
|
|
QgsProcessingException,
|
|
QgsProcessingParameterNumber,
|
|
QgsProcessingParameterVectorDestination)
|
|
from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
|
|
from processing.algs.gdal.GdalUtils import GdalUtils
|
|
|
|
|
|
class OffsetCurve(GdalAlgorithm):
|
|
INPUT = 'INPUT'
|
|
GEOMETRY = 'GEOMETRY'
|
|
DISTANCE = 'DISTANCE'
|
|
OPTIONS = 'OPTIONS'
|
|
OUTPUT = 'OUTPUT'
|
|
|
|
def __init__(self):
|
|
super().__init__()
|
|
|
|
def initAlgorithm(self, config=None):
|
|
self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
|
|
self.tr('Input layer'),
|
|
[QgsProcessing.SourceType.TypeVectorLine]))
|
|
self.addParameter(QgsProcessingParameterString(self.GEOMETRY,
|
|
self.tr('Geometry column name'),
|
|
defaultValue='geometry'))
|
|
self.addParameter(QgsProcessingParameterDistance(self.DISTANCE,
|
|
self.tr('Offset distance (left-sided: positive, right-sided: negative)'),
|
|
parentParameterName=self.INPUT,
|
|
defaultValue=10))
|
|
|
|
options_param = QgsProcessingParameterString(self.OPTIONS,
|
|
self.tr('Additional creation options'),
|
|
defaultValue='',
|
|
optional=True)
|
|
options_param.setFlags(options_param.flags() | QgsProcessingParameterDefinition.Flag.FlagAdvanced)
|
|
self.addParameter(options_param)
|
|
|
|
self.addParameter(QgsProcessingParameterVectorDestination(self.OUTPUT,
|
|
self.tr('Offset curve'),
|
|
QgsProcessing.SourceType.TypeVectorLine))
|
|
|
|
def name(self):
|
|
return 'offsetcurve'
|
|
|
|
def displayName(self):
|
|
return self.tr('Offset curve')
|
|
|
|
def group(self):
|
|
return self.tr('Vector geoprocessing')
|
|
|
|
def groupId(self):
|
|
return 'vectorgeoprocessing'
|
|
|
|
def commandName(self):
|
|
return 'ogr2ogr'
|
|
|
|
def getConsoleCommands(self, parameters, context, feedback, executing=True):
|
|
source = self.parameterAsSource(parameters, self.INPUT, context)
|
|
if source is None:
|
|
raise QgsProcessingException(self.invalidSourceError(parameters, self.INPUT))
|
|
|
|
fields = source.fields()
|
|
ogrLayer, layerName = self.getOgrCompatibleSource(self.INPUT, parameters, context, feedback, executing)
|
|
geometry = self.parameterAsString(parameters, self.GEOMETRY, context)
|
|
distance = self.parameterAsDouble(parameters, self.DISTANCE, context)
|
|
options = self.parameterAsString(parameters, self.OPTIONS, context)
|
|
outFile = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
|
|
self.setOutputValue(self.OUTPUT, outFile)
|
|
|
|
output, outputFormat = GdalUtils.ogrConnectionStringAndFormat(outFile, context)
|
|
|
|
other_fields_exist = any(
|
|
True for f in fields
|
|
if f.name() != geometry
|
|
)
|
|
|
|
other_fields = ',*' if other_fields_exist else ''
|
|
|
|
arguments = [
|
|
output,
|
|
ogrLayer,
|
|
'-dialect',
|
|
'sqlite',
|
|
'-sql'
|
|
]
|
|
sql = f'SELECT ST_OffsetCurve({geometry}, {distance}) AS {geometry}{other_fields} FROM "{layerName}"'
|
|
arguments.append(sql)
|
|
|
|
if options:
|
|
arguments.append(options)
|
|
|
|
if outputFormat:
|
|
arguments.append(f'-f {outputFormat}')
|
|
|
|
return ['ogr2ogr', GdalUtils.escapeAndJoin(arguments)]
|