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84 lines
3.3 KiB
Python
84 lines
3.3 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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v_net_distance.py
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---------------------
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Date : December 2015
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Copyright : (C) 2015 by Médéric Ribreux
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Email : medspx at medspx dot fr
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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__ = 'Médéric Ribreux'
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__date__ = 'December 2015'
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__copyright__ = '(C) 2015, Médéric Ribreux'
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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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import os
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from .v_net import variableOutput
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from processing.tools.system import getTempFilename
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from qgis.core import QgsProcessingParameterString
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def processCommand(alg, parameters, context, feedback):
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""" Handle data preparation for v.net.distance:
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* Integrate point layers into network vector map.
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* Make v.net.distance use those layers.
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* Delete the threshold parameter.
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* If where statement, connect to the db
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"""
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# Grab the point layer and delete this parameter
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lineLayer = alg.exportedLayers['input']
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fromLayer = alg.exportedLayers['flayer']
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toLayer = alg.exportedLayers['tlayer']
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intLayer = 'bufnet' + os.path.basename(getTempFilename())
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netLayer = 'net' + os.path.basename(getTempFilename())
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threshold = alg.parameterAsDouble(parameters, 'threshold', context)
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# Create the v.net connect command for from_layer integration
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command = u"v.net input={} points={} output={} operation=connect threshold={} arc_layer=1 node_layer=2".format(
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lineLayer, fromLayer, intLayer, threshold)
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alg.commands.append(command)
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# Do it again with to_layer
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command = u"v.net input={} points={} output={} operation=connect threshold={} arc_layer=1 node_layer=3".format(
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intLayer, toLayer, netLayer, threshold)
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alg.commands.append(command)
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# Connect the point layer database to the layer 2 of the network
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command = u"v.db.connect -o map={} table={} layer=2".format(netLayer, fromLayer)
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alg.commands.append(command)
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command = u"v.db.connect -o map={} table={} layer=3".format(netLayer, toLayer)
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alg.commands.append(command)
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# remove undesired parameters
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alg.removeParameter('flayer')
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alg.removeParameter('tlayer')
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alg.removeParameter('threshold')
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alg.exportedLayers['input'] = netLayer
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# Add the two new parameters
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fLayer = QgsProcessingParameterString('from_layer', None, 2, False, False)
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alg.addParameter(fLayer)
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tLayer = QgsProcessingParameterString('to_layer', None, 3, False, False)
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alg.addParameter(tLayer)
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alg.processCommand(parameters, context, feedback)
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def processOutputs(alg, parameters, context, feedback):
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outputParameter = {'output': ['output', 'line', 1, True]}
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variableOutput(alg, outputParameter, parameters, context)
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