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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
159 lines
7.0 KiB
Python
159 lines
7.0 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Buffer.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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QgsProcessingParameterDistance,
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QgsProcessingParameterDefinition,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterField,
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QgsProcessingParameterString,
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QgsProcessingParameterNumber,
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QgsProcessingException,
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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 Buffer(GdalAlgorithm):
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INPUT = 'INPUT'
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FIELD = 'FIELD'
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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.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
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self.tr('Input layer')))
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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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parentParameterName=self.INPUT,
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minValue=0.0,
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defaultValue=10.0))
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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('Buffer'),
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QgsProcessing.TypeVectorPolygon))
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def name(self):
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return 'buffervectors'
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def displayName(self):
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return self.tr('Buffer vectors')
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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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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_Buffer({}, {})) AS {}{} FROM '{}'".format(geometry, distance, geometry, other_fields, layerName)
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else:
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sql = "SELECT ST_Buffer({}, {}) AS {}{} FROM '{}'".format(geometry, distance, 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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