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81 lines
3.2 KiB
Python
81 lines
3.2 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Smooth.py
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---------
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Date : November 2015
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Copyright : (C) 2015 by Nyall Dawson
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Email : nyall dot dawson 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__ = 'Nyall Dawson'
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__date__ = 'November 2015'
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__copyright__ = '(C) 2015, Nyall Dawson'
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# This will get replaced with a git SHA1 when you do a git archive323
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__revision__ = '$Format:%H$'
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from qgis.core import (QgsProcessingException,
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QgsProcessingParameterNumber)
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from processing.algs.qgis.QgisAlgorithm import QgisFeatureBasedAlgorithm
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class Smooth(QgisFeatureBasedAlgorithm):
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ITERATIONS = 'ITERATIONS'
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MAX_ANGLE = 'MAX_ANGLE'
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OFFSET = 'OFFSET'
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def group(self):
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return self.tr('Vector geometry tools')
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def __init__(self):
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super().__init__()
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def initParameters(self, config=None):
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self.addParameter(QgsProcessingParameterNumber(self.ITERATIONS,
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self.tr('Iterations'),
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defaultValue=1, minValue=1, maxValue=10))
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self.addParameter(QgsProcessingParameterNumber(self.OFFSET,
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self.tr('Offset'), QgsProcessingParameterNumber.Double,
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defaultValue=0.25, minValue=0.0, maxValue=0.5))
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self.addParameter(QgsProcessingParameterNumber(self.MAX_ANGLE,
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self.tr('Maximum node angle to smooth'), QgsProcessingParameterNumber.Double,
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defaultValue=180.0, minValue=0.0, maxValue=180.0))
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def name(self):
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return 'smoothgeometry'
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def displayName(self):
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return self.tr('Smooth geometry')
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def outputName(self):
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return self.tr('Smoothed')
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def prepareAlgorithm(self, parameters, context, feedback):
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self.iterations = self.parameterAsInt(parameters, self.ITERATIONS, context)
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self.offset = self.parameterAsDouble(parameters, self.OFFSET, context)
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self.max_angle = self.parameterAsDouble(parameters, self.MAX_ANGLE, context)
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return True
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def processFeature(self, feature, feedback):
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if feature.hasGeometry():
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output_geometry = feature.geometry().smooth(self.iterations, self.offset, -1, self.max_angle)
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if not output_geometry:
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raise QgsProcessingException(
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self.tr('Error smoothing geometry'))
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feature.setGeometry(output_geometry)
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return feature
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