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"""
***************************************************************************
PointsAlongLines.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. *
* *
***************************************************************************
"""
__author__ = "Giovanni Manghi"
__date__ = "January 2015"
__copyright__ = "(C) 2015, Giovanni Manghi"
from qgis.core import (
QgsProcessingException,
QgsProcessingParameterFeatureSource,
QgsProcessingParameterString,
QgsProcessingParameterNumber,
QgsProcessingParameterVectorDestination,
QgsProcessingParameterDefinition,
QgsProcessing,
)
from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
from processing.algs.gdal.GdalUtils import GdalUtils
class PointsAlongLines(GdalAlgorithm):
INPUT = "INPUT"
GEOMETRY = "GEOMETRY"
DISTANCE = "DISTANCE"
OPTIONS = "OPTIONS"
OUTPUT = "OUTPUT"
def __init__(self):
super().__init__()
def initAlgorithm(self, config=None):
self.addParameter(
QgsProcessingParameterFeatureSource(
self.INPUT,
self.tr("Input layer"),
[QgsProcessing.SourceType.TypeVectorLine],
)
)
self.addParameter(
QgsProcessingParameterString(
self.GEOMETRY, self.tr("Geometry column name"), defaultValue="geometry"
)
)
self.addParameter(
QgsProcessingParameterNumber(
self.DISTANCE,
self.tr(
"Distance from line start represented as fraction of line length"
),
type=QgsProcessingParameterNumber.Type.Double,
minValue=0,
maxValue=1,
defaultValue=0.5,
)
)
options_param = QgsProcessingParameterString(
self.OPTIONS,
self.tr("Additional creation options"),
defaultValue="",
optional=True,
)
options_param.setFlags(
options_param.flags() | QgsProcessingParameterDefinition.Flag.FlagAdvanced
)
self.addParameter(options_param)
self.addParameter(
QgsProcessingParameterVectorDestination(
self.OUTPUT,
self.tr("Points along lines"),
QgsProcessing.SourceType.TypeVectorPoint,
)
)
def name(self):
return "pointsalonglines"
def displayName(self):
return self.tr("Points along lines")
def group(self):
return self.tr("Vector geoprocessing")
def groupId(self):
return "vectorgeoprocessing"
def commandName(self):
return "ogr2ogr"
def getConsoleCommands(self, parameters, context, feedback, executing=True):
source = self.parameterAsSource(parameters, self.INPUT, context)
if source is None:
raise QgsProcessingException(
self.invalidSourceError(parameters, self.INPUT)
)
fields = source.fields()
input_details = self.getOgrCompatibleSource(
self.INPUT, parameters, context, feedback, executing
)
distance = self.parameterAsDouble(parameters, self.DISTANCE, context)
geometry = self.parameterAsString(parameters, self.GEOMETRY, context)
outFile = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
self.setOutputValue(self.OUTPUT, outFile)
options = self.parameterAsString(parameters, self.OPTIONS, context)
output_details = GdalUtils.gdal_connection_details_from_uri(outFile, context)
other_fields_exist = any(f for f in fields if f.name() != geometry)
other_fields = ",*" if other_fields_exist else ""
arguments = [
output_details.connection_string,
input_details.connection_string,
"-dialect",
"sqlite",
"-sql",
f'SELECT ST_Line_Interpolate_Point({geometry}, {distance}) AS {geometry}{other_fields} FROM "{input_details.layer_name}"',
]
if input_details.open_options:
arguments.extend(input_details.open_options_as_arguments())
if input_details.credential_options:
arguments.extend(input_details.credential_options_as_arguments())
if options:
arguments.append(options)
if output_details.format:
arguments.append(f"-f {output_details.format}")
return ["ogr2ogr", GdalUtils.escapeAndJoin(arguments)]
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