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130 lines
5.0 KiB
Python
130 lines
5.0 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 qgis.core import QgsProcessingException
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from processing.tools.system import getTempFilename
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def incorporatePoints(alg, parameters, context, feedback, pointLayerName='points', networkLayerName='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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# Grab the point layer and delete this parameter
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pointLayer = alg.parameterAsVectorLayer(parameters, pointLayerName, context)
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if pointLayer:
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# Create an intermediate GRASS layer which is the combination of network + centers
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intLayer = 'net' + os.path.basename(getTempFilename())
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pointLayer = alg.exportedLayers[pointLayerName]
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# Grab the network layer
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lineLayer = alg.parameterAsVectorLayer(parameters, networkLayerName, context)
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if lineLayer:
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lineLayer = alg.exportedLayers[networkLayerName]
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else:
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raise QgsProcessingException(
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alg.tr('GRASS GIS 7 v.net requires a lines layer!'))
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threshold = alg.parameterAsDouble(parameters, 'threshold', context)
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# Create the v.net connect command for point layer integration
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command = 'v.net -s input={} points={} output={} operation=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 = 'v.db.connect -o map={} table={} layer=2'.format(intLayer, pointLayer)
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alg.commands.append(command)
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# remove undesired parameters
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alg.removeParameter(pointLayerName)
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# Use temp layer for input
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alg.exportedLayers[networkLayerName] = intLayer
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# Process the command
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if 'threshold' in parameters:
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alg.removeParameter('threshold')
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alg.processCommand(parameters, context, feedback)
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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 a dict of outputs:
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{ 'outputName': ['srcLayer', 'output_type', output_layer_number, nocats],
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...
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}
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where:
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- outputName is the name of the output in the description file.
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- srcLayer is the grass name of the layer to export.
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- output_type is the GRASS datatype (point/line/area/etc.).
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- output_layer_number is the GRASS layer number for multiple layers datasets.
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- nocats indicates weither we need to also export without categories items.
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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 layers.items():
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if not isinstance(typeList, list):
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continue
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file_name = alg.parameterAsOutputLayer(parameters, outputName, context)
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src_layer = typeList[0]
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output_type = typeList[1]
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output_layer_number = typeList[2]
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no_cats = typeList[3]
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grass_name = '{}{}'.format(src_layer, alg.uniqueSuffix)
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alg.exportVectorLayer(grassName=grass_name,
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fileName=file_name,
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layer=output_layer_number,
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exportnocat=no_cats,
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dataType=output_type)
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def processOutputs(alg, parameters, context, feedback):
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idx = alg.parameterAsInt(parameters, 'operation', context)
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operations = alg.parameterDefinition('operation').options()
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operation = operations[idx]
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if operation == 'nodes':
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outputParameter = {'output': ['output', 'point', 2, True]}
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elif operation == 'connect':
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outputParameter = {'output': ['output', 'line', 1, False]}
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elif operation == 'arcs':
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outputParameter = {'output': ['output', 'line', 1, True]}
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variableOutput(alg, outputParameter, parameters, context)
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