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5339d62715
Include descriptive text with the specified parameter value in error, and always check that sources were loaded to avoid raw Python exceptions when they are not
170 lines
7.6 KiB
Python
170 lines
7.6 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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OneSideBuffer.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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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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from qgis.core import (QgsProcessing,
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QgsProcessingException,
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QgsProcessingParameterDefinition,
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QgsProcessingParameterDistance,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterEnum,
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QgsProcessingParameterField,
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QgsProcessingParameterString,
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QgsProcessingParameterNumber,
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QgsProcessingParameterBoolean,
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QgsProcessingParameterVectorDestination)
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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 OneSideBuffer(GdalAlgorithm):
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INPUT = 'INPUT'
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FIELD = 'FIELD'
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BUFFER_SIDE = 'BUFFER_SIDE'
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GEOMETRY = 'GEOMETRY'
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DISTANCE = 'DISTANCE'
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DISSOLVE = 'DISSOLVE'
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EXPLODE_COLLECTIONS = 'EXPLODE_COLLECTIONS'
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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.bufferSides = [self.tr('Right'), self.tr('Left')]
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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
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self.tr('Input layer'),
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[QgsProcessing.TypeVectorLine]))
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self.addParameter(QgsProcessingParameterString(self.GEOMETRY,
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self.tr('Geometry column name'),
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defaultValue='geometry'))
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self.addParameter(QgsProcessingParameterDistance(self.DISTANCE,
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self.tr('Buffer distance'),
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defaultValue=10,
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parentParameterName=self.INPUT))
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self.addParameter(QgsProcessingParameterEnum(self.BUFFER_SIDE,
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self.tr('Buffer side'),
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options=self.bufferSides,
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allowMultiple=False,
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defaultValue=0))
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self.addParameter(QgsProcessingParameterField(self.FIELD,
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self.tr('Dissolve by attribute'),
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None,
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self.INPUT,
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QgsProcessingParameterField.Any,
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optional=True))
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self.addParameter(QgsProcessingParameterBoolean(self.DISSOLVE,
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self.tr('Dissolve all results'),
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defaultValue=False))
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self.addParameter(QgsProcessingParameterBoolean(self.EXPLODE_COLLECTIONS,
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self.tr('Produce one feature for each geometry in any kind of geometry collection in the source file'),
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defaultValue=False))
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options_param = QgsProcessingParameterString(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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options_param.setFlags(options_param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
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self.addParameter(options_param)
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self.addParameter(QgsProcessingParameterVectorDestination(self.OUTPUT,
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self.tr('One-sided buffer'),
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QgsProcessing.TypeVectorPolygon))
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def name(self):
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return 'onesidebuffer'
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def displayName(self):
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return self.tr('One side buffer')
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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(self.invalidSourceError(parameters, self.INPUT))
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fields = source.fields()
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ogrLayer, layerName = self.getOgrCompatibleSource(self.INPUT, parameters, context, feedback, executing)
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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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side = self.parameterAsEnum(parameters, self.BUFFER_SIDE, context)
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fieldName = self.parameterAsString(parameters, self.FIELD, context)
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dissolve = self.parameterAsBool(parameters, self.DISSOLVE, 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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output, outputFormat = GdalUtils.ogrConnectionStringAndFormat(outFile, context)
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other_fields = []
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for f in fields:
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if f.name() == geometry:
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continue
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other_fields.append(f.name())
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if other_fields:
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other_fields = ', {}'.format(','.join(other_fields))
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else:
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other_fields = ''
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arguments = []
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arguments.append(output)
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arguments.append(ogrLayer)
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arguments.append('-dialect')
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arguments.append('sqlite')
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arguments.append('-sql')
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if dissolve or fieldName:
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sql = "SELECT ST_Union(ST_SingleSidedBuffer({}, {}, {})) AS {}{} FROM '{}'".format(geometry, distance, side, geometry, other_fields, layerName)
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else:
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sql = "SELECT ST_SingleSidedBuffer({}, {}, {}) AS {}{} FROM '{}'".format(geometry, distance, side, geometry, other_fields, layerName)
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if fieldName:
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sql = '"{} GROUP BY {}"'.format(sql, fieldName)
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arguments.append(sql)
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if self.parameterAsBool(parameters, self.EXPLODE_COLLECTIONS, context):
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arguments.append('-explodecollections')
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if options:
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arguments.append(options)
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if outputFormat:
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arguments.append('-f {}'.format(outputFormat))
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return ['ogr2ogr', GdalUtils.escapeAndJoin(arguments)]
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