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92 lines
3.5 KiB
Python
92 lines
3.5 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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v_net.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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This Python module handles pre-treatment operations for v.net.* GRASS7 modules.
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Before using a v.net module you often have to incorporate a points layer into
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the network vector map.
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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 copy import deepcopy
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def incorporatePoints(alg, parameters, context, pointLayerName=u'points', networkLayerName=u'input'):
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"""
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incorporate points with lines to form a GRASS network
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"""
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new_parameters = deepcopy(parameters)
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# Create an intermediate GRASS layer which is the combination of network + centers
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intLayer = alg.getTempFilename()
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# Grab the point layer and delete this parameter (not used by v.net.alloc)
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pointLayer = new_parameters[pointLayerName]
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if pointLayer:
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pointLayer = alg.exportedLayers[pointLayer]
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new_parameters['points'] = pointLayer
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# Grab the network layer and tell to v.net.alloc to use the temp layer instead
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lineLayer = new_parameters[networkLayerName]
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if lineLayer:
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lineLayer = alg.exportedLayers[lineLayer]
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new_parameters[networkLayerName] = lineLayer
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threshold = parameters['threshold']
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# Create the v.net connect command for point layer integration
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command = u"v.net -s input={} points={} out={} op=connect threshold={}".format(
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lineLayer, pointLayer, intLayer, 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(intLayer, pointLayer)
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alg.commands.append(command)
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alg.processCommand(new_parameters, context)
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def variableOutput(alg, layers, parameters, context, nocats=True):
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""" Handle variable data output for v.net modules:
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:param layers:
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layers is like:
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{ 'output': ['point', 1], # One output of type point from layer 1
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'output2': ['line', 1], # One output of type line from layer 1
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'output3': ['point', 2] # one output of type point from layer 2
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}
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:param parameters:
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:param context:
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:param nocats: do not add categories.
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"""
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for outputName, typeList in list(layers.items()):
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if not isinstance(typeList, list):
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continue
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fileName = alg.parameterAsOutputLayer(parameters, outputName, context)
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grassName = '{}{}'.format(outputName, alg.uniqueSuffix)
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alg.exportVectorLayer(
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grassName, fileName, typeList[0], typeList[1],
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False if typeList[0] == u"line" and nocats else nocats)
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