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fd2c18ee16
temporary output layers in the provided processing context Should fix loss of intermediate memory layers when running a multi-step model
88 lines
3.4 KiB
Python
88 lines
3.4 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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VariableDistanceBuffer.py
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---------------------
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Date : August 2012
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Copyright : (C) 2012 by Victor Olaya
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Email : volayaf at gmail dot com
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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__ = 'Victor Olaya'
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__date__ = 'August 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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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.PyQt.QtGui import QIcon
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from qgis.core import QgsWkbTypes
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterBoolean
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from processing.core.parameters import ParameterNumber
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from processing.core.parameters import ParameterTableField
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from processing.core.outputs import OutputVector
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from . import Buffer as buff
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from processing.tools import dataobjects
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class VariableDistanceBuffer(GeoAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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FIELD = 'FIELD'
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SEGMENTS = 'SEGMENTS'
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DISSOLVE = 'DISSOLVE'
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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'buffer.png'))
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def group(self):
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return self.tr('Vector geometry tools')
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def name(self):
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return 'variabledistancebuffer'
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def displayName(self):
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return self.tr('Variable distance buffer')
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def defineCharacteristics(self):
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self.addParameter(ParameterVector(self.INPUT,
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self.tr('Input layer')))
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self.addParameter(ParameterTableField(self.FIELD,
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self.tr('Distance field'), self.INPUT))
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self.addParameter(ParameterNumber(self.SEGMENTS,
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self.tr('Segments'), 1, default=5))
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self.addParameter(ParameterBoolean(self.DISSOLVE,
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self.tr('Dissolve result'), False))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Buffer'), datatype=[dataobjects.TYPE_VECTOR_POLYGON]))
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def processAlgorithm(self, context, feedback):
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layer = dataobjects.getLayerFromString(self.getParameterValue(self.INPUT))
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dissolve = self.getParameterValue(self.DISSOLVE)
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field = self.getParameterValue(self.FIELD)
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segments = int(self.getParameterValue(self.SEGMENTS))
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(layer.fields().toList(), QgsWkbTypes.Polygon,
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layer.crs(), context)
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buff.buffering(feedback, context, writer, 0, field, True, layer, dissolve, segments)
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