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Since it's safe to evaluate parameters in background threads now, it's usually going to be ok to evaluate everything in the processAlgorithm step. This keeps the algorithm code as simple as possible, and will make porting faster. Note that the prepare/postProcess virtual methods still exist and can be used when an algorithm MUST do setup/cleanup work in the main thread.
103 lines
4.5 KiB
Python
103 lines
4.5 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 (QgsApplication,
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QgsFeatureSink,
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QgsProcessingUtils,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterFeatureSink,
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QgsProcessingParameterNumber,
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QgsProcessingOutputVectorLayer)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.tools import dataobjects
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class Smooth(QgisAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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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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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
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self.tr('Input layer'), [dataobjects.TYPE_VECTOR_POLYGON, dataobjects.TYPE_VECTOR_LINE]))
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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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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Smoothed')))
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self.addOutput(QgsProcessingOutputVectorLayer(self.OUTPUT, self.tr('Smoothed')))
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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 processAlgorithm(self, parameters, context, feedback):
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source = self.parameterAsSource(parameters, self.INPUT, context)
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iterations = self.parameterAsInt(parameters, self.ITERATIONS, context)
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offset = self.parameterAsDouble(parameters, self.OFFSET, context)
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max_angle = self.parameterAsDouble(parameters, self.MAX_ANGLE, context)
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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source.fields(), source.wkbType(), source.sourceCrs())
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features = source.getFeatures()
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total = 100.0 / source.featureCount() if source.featureCount() else 0
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for current, input_feature in enumerate(features):
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if feedback.isCanceled():
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break
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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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sink.addFeature(output_feature, QgsFeatureSink.FastInsert)
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feedback.setProgress(int(current * total))
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return {self.OUTPUT: dest_id}
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