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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
135 lines
5.5 KiB
Python
135 lines
5.5 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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PointsAlongLines.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 (QgsProcessingException,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterString,
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QgsProcessingParameterNumber,
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QgsProcessingParameterVectorDestination,
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QgsProcessingParameterDefinition,
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QgsProcessing)
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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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from processing.tools.system import isWindows
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class PointsAlongLines(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(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(QgsProcessingParameterNumber(self.DISTANCE,
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self.tr('Distance from line start represented as fraction of line length'),
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type=QgsProcessingParameterNumber.Double,
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minValue=0,
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maxValue=1,
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defaultValue=0.5))
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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('Points along lines'),
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QgsProcessing.TypeVectorPoint))
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def name(self):
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return 'pointsalonglines'
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def displayName(self):
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return self.tr('Points along lines')
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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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distance = self.parameterAsDouble(parameters, self.DISTANCE, context)
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geometry = self.parameterAsString(parameters, self.GEOMETRY, context)
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outFile = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
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options = self.parameterAsString(parameters, self.OPTIONS, 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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sql = "SELECT ST_Line_Interpolate_Point({}, {}) AS {}{} FROM '{}'".format(geometry, distance, geometry, other_fields, layerName)
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arguments.append(sql)
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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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