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Add v.lrs.segment algorithm

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Médéric RIBREUX
Médéric RIBREUX committed Mar 12, 2016
1 parent 1ebd768 commit 903a804bc37a308bbea74ee9e974bbab6bf8f39b
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v.lrs.segment
Creates points/segments from input lines, linear reference system and positions read from stdin or a file.
Vector (v.*)
ParameterVector|input|Input vector map containing lines|1|False
ParameterTable|rstable|Name of the reference system table|False
ParameterString|in_file|Inline rules for segment|None|True|True
ParameterFile|file|Name of file containing segment rules|False|True
OutputVector|output|Segments
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# -*- coding: utf-8 -*-

"""
***************************************************************************
v_lrs_segment.py
----------------
Date : March 2016
Copyright : (C) 2016 by Médéric Ribreux
Email : medspx at medspx dot fr
***************************************************************************
* *
* 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__ = 'Médéric Ribreux'
__date__ = 'March 2016'
__copyright__ = '(C) 2016, Médéric Ribreux'

# This will get replaced with a git SHA1 when you do a git archive

__revision__ = '$Format:%H$'


def checkParameterValuesBeforeExecuting(alg):
""" Verify if we have the right parameters """
if alg.getParameterValue('in_file') and alg.getParameterValue(u'file'):
return alg.tr("You need to set either a segment rules file or write directly the rules!")

return None


def processInputs(alg):
# We need to import the rstable
rstable = alg.getParameterValue('rstable')
if rstable in alg.exportedLayers.keys():
return
alg.exportedLayers[rstable] = alg.getTempFilename()
command = 'db.in.ogr input=\"{}\" output={} --overwrite'.format(
rstable,
alg.exportedLayers[rstable]
)
alg.commands.append(command)
alg.processInputs()


def processCommand(alg):
in_file = alg.getParameterValue('in_file')
if in_file:
# Creates a temporary txt file
ruleFile = alg.getTempFilename()

# Inject rules into temporary txt file
with open(ruleFile, "w") as tempRules:
tempRules.write(in_file)
else:
ruleFile = alg.getParameterValue('file')

output = alg.getOutputFromName(u'output')
alg.exportedLayers[output.value] = output.name + alg.uniqueSufix

command = 'v.lrs.segment input={} file={} rstable={} output={} --overwrite'.format(
alg.exportedLayers[alg.getParameterValue('input')],
ruleFile,
alg.exportedLayers[alg.getParameterValue('rstable')],
alg.exportedLayers[output.value]
)
alg.commands.append(command)

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