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4d60d0cdb5
segments shorter than a certain threshold or sharp corners with an angle exceeding a threshold Expose the angle threshold to processing smooth algorithm Also: - optimise QgsGeometry::smooth for new geometry classes - Fix smooth does not work with geometries containing Z/M
88 lines
3.7 KiB
Python
88 lines
3.7 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 QgsFeature
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.core.parameters import ParameterVector, ParameterNumber
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects, vector
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class Smooth(GeoAlgorithm):
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INPUT_LAYER = 'INPUT_LAYER'
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OUTPUT_LAYER = 'OUTPUT_LAYER'
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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 defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Smooth geometry')
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self.group, self.i18n_group = self.trAlgorithm('Vector geometry tools')
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self.addParameter(ParameterVector(self.INPUT_LAYER,
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self.tr('Input layer'), [dataobjects.TYPE_VECTOR_POLYGON, dataobjects.TYPE_VECTOR_LINE]))
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self.addParameter(ParameterNumber(self.ITERATIONS,
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self.tr('Iterations'), default=1, minValue=1, maxValue=10))
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self.addParameter(ParameterNumber(self.OFFSET,
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self.tr('Offset'), default=0.25, minValue=0.0, maxValue=0.5))
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self.addParameter(ParameterNumber(self.MAX_ANGLE,
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self.tr('Maximum node angle to smooth'), default=180.0, minValue=0.0, maxValue=180.0))
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self.addOutput(OutputVector(self.OUTPUT_LAYER, self.tr('Smoothed')))
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def processAlgorithm(self, progress):
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layer = dataobjects.getObjectFromUri(
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self.getParameterValue(self.INPUT_LAYER))
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iterations = self.getParameterValue(self.ITERATIONS)
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offset = self.getParameterValue(self.OFFSET)
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max_angle = self.getParameterValue(self.MAX_ANGLE)
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writer = self.getOutputFromName(
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self.OUTPUT_LAYER).getVectorWriter(
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layer.fields().toList(),
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layer.wkbType(),
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layer.crs())
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features = vector.features(layer)
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total = 100.0 / len(features)
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for current, input_feature in enumerate(features):
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output_feature = input_feature
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if input_feature.geometry():
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output_geometry = input_feature.geometry().smooth(iterations, offset, -1, max_angle)
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if not output_geometry:
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raise GeoAlgorithmExecutionException(
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self.tr('Error smoothing geometry'))
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output_feature.setGeometry(output_geometry)
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writer.addFeature(output_feature)
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progress.setPercentage(int(current * total))
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del writer
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