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124 lines
5.2 KiB
Python
124 lines
5.2 KiB
Python
"""
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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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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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self.setOutputValue(self.OUTPUT, outFile)
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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_exist = any(
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f for f in fields
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if f.name() != geometry
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)
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other_fields = ',*' if other_fields_exist else ''
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arguments = [
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output,
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ogrLayer,
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'-dialect',
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'sqlite',
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'-sql',
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f'SELECT ST_Line_Interpolate_Point({geometry}, {distance}) AS {geometry}{other_fields} FROM "{layerName}"'
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]
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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'-f {outputFormat}')
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return ['ogr2ogr', GdalUtils.escapeAndJoin(arguments)]
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