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Merge pull request #5243 from alexbruy/processing-gdal
[processing] restore GDAL algorithms
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| Original file line number | Diff line number | Diff line change |
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| # -*- coding: utf-8 -*- | ||
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| """ | ||
| *************************************************************************** | ||
| Buffer.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. * | ||
| * * | ||
| *************************************************************************** | ||
| """ | ||
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| __author__ = 'Giovanni Manghi' | ||
| __date__ = 'January 2015' | ||
| __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, | ||
| QgsProcessingParameterDefinition, | ||
| QgsProcessingParameterFeatureSource, | ||
| QgsProcessingParameterField, | ||
| QgsProcessingParameterString, | ||
| QgsProcessingParameterNumber, | ||
| QgsProcessingParameterBoolean, | ||
| QgsProcessingParameterVectorDestination) | ||
| from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm | ||
| from processing.algs.gdal.GdalUtils import GdalUtils | ||
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| class Buffer(GdalAlgorithm): | ||
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| INPUT = 'INPUT' | ||
| FIELD = 'FIELD' | ||
| GEOMETRY = 'GEOMETRY' | ||
| DISTANCE = 'DISTANCE' | ||
| DISSOLVE = 'DISSOLVE' | ||
| EXPLODE_COLLECTIONS = 'EXPLODE_COLLECTIONS' | ||
| OPTIONS = 'OPTIONS' | ||
| OUTPUT = 'OUTPUT' | ||
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| def __init__(self): | ||
| super().__init__() | ||
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| def initAlgorithm(self, config=None): | ||
| self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT, | ||
| self.tr('Input layer'))) | ||
| self.addParameter(QgsProcessingParameterString(self.GEOMETRY, | ||
| self.tr('Geometry column name'), | ||
| defaultValue='geometry')) | ||
| self.addParameter(QgsProcessingParameterNumber(self.DISTANCE, | ||
| self.tr('Buffer distance'), | ||
| type=QgsProcessingParameterNumber.Double, | ||
| minValue=0.0, | ||
| defaultValue=10.0)) | ||
| self.addParameter(QgsProcessingParameterField(self.FIELD, | ||
| self.tr('Dissolve by attribute'), | ||
| None, | ||
| self.INPUT, | ||
| QgsProcessingParameterField.Any, | ||
| optional=True)) | ||
| self.addParameter(QgsProcessingParameterBoolean(self.DISSOLVE, | ||
| self.tr('Dissolve all results'), | ||
| defaultValue=False)) | ||
| self.addParameter(QgsProcessingParameterBoolean(self.EXPLODE_COLLECTIONS, | ||
| self.tr('Produce one feature for each geometry in any kind of geometry collection in the source file'), | ||
| defaultValue=False)) | ||
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| options_param = QgsProcessingParameterString(self.OPTIONS, | ||
| self.tr('Additional creation options'), | ||
| defaultValue='', | ||
| optional=True) | ||
| options_param.setFlags(options_param.flags() | QgsProcessingParameterDefinition.FlagAdvanced) | ||
| self.addParameter(options_param) | ||
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| self.addParameter(QgsProcessingParameterVectorDestination(self.OUTPUT, | ||
| self.tr('Buffer'), | ||
| QgsProcessing.TypeVectorPolygon)) | ||
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| def name(self): | ||
| return 'buffervectors' | ||
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| def displayName(self): | ||
| return self.tr('Buffer vectors') | ||
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| def group(self): | ||
| return self.tr('Vector geoprocessing') | ||
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| def commandName(self): | ||
| return 'ogr2ogr' | ||
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| def getConsoleCommands(self, parameters, context, feedback): | ||
| fields = self.parameterAsSource(parameters, self.INPUT, context).fields() | ||
| ogrLayer, layerName = self.getOgrCompatibleSource(self.INPUT, parameters, context, feedback) | ||
| geometry = self.parameterAsString(parameters, self.GEOMETRY, context) | ||
| distance = self.parameterAsDouble(parameters, self.DISTANCE, context) | ||
| fieldName = self.parameterAsString(parameters, self.FIELD, context) | ||
| dissolve = self.parameterAsString(parameters, self.DISSOLVE, context) | ||
| options = self.parameterAsString(parameters, self.OPTIONS, context) | ||
| outFile = self.parameterAsOutputLayer(parameters, self.OUTPUT, context) | ||
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| output, outputFormat = GdalUtils.ogrConnectionStringAndFormat(outFile, context) | ||
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| other_fields = [] | ||
| for f in fields: | ||
| if f.name() == geometry: | ||
| continue | ||
| other_fields.append(f.name()) | ||
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| arguments = [] | ||
| arguments.append(output) | ||
| arguments.append(ogrLayer) | ||
| arguments.append('-dialect') | ||
| arguments.append('sqlite') | ||
| arguments.append('-sql') | ||
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| if dissolve or fieldName: | ||
| sql = "SELECT ST_Union(ST_Buffer({}, {})) AS {}, {} FROM '{}'".format(geometry, distance, geometry, ','.join(other_fields), layerName) | ||
| else: | ||
| sql = "SELECT ST_Buffer({}, {}) AS {}, {} FROM '{}'".format(geometry, distance, geometry, ','.join(other_fields), layerName) | ||
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| if fieldName: | ||
| 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): | ||
| arguments.append('-explodecollections') | ||
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| if options: | ||
| arguments.append(options) | ||
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| if outputFormat: | ||
| arguments.append('-f {}'.format(outputFormat)) | ||
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| return ['ogr2ogr', GdalUtils.escapeAndJoin(arguments)] |
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