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43cd62b62f
Instead of returning a single QgsFeature from processFeature, we now return a list of features. This allows feature based algorithms which return multiple features per input feature, e.g. "explode" type algorithms which split a single input feature into multiple output features.
95 lines
3.8 KiB
Python
95 lines
3.8 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Orthogonalize.py
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----------------
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Date : December 2016
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Copyright : (C) 2016 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__ = 'December 2016'
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__copyright__ = '(C) 2016, 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 (QgsProcessing,
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QgsProcessingException,
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QgsProcessingParameterDefinition,
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QgsProcessingParameterNumber)
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from processing.algs.qgis.QgisAlgorithm import QgisFeatureBasedAlgorithm
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class Orthogonalize(QgisFeatureBasedAlgorithm):
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MAX_ITERATIONS = 'MAX_ITERATIONS'
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DISTANCE_THRESHOLD = 'DISTANCE_THRESHOLD'
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ANGLE_TOLERANCE = 'ANGLE_TOLERANCE'
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def tags(self):
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return self.tr('rectangle,perpendicular,right,angles,square,quadrilateralise').split(',')
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def group(self):
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return self.tr('Vector geometry')
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def groupId(self):
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return 'vectorgeometry'
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def __init__(self):
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super().__init__()
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self.max_iterations = None
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self.angle_tolerance = None
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def initParameters(self, config=None):
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self.addParameter(QgsProcessingParameterNumber(self.ANGLE_TOLERANCE,
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self.tr('Maximum angle tolerance (degrees)'),
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type=QgsProcessingParameterNumber.Double,
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minValue=0.0, maxValue=45.0, defaultValue=15.0))
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max_iterations = QgsProcessingParameterNumber(self.MAX_ITERATIONS,
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self.tr('Maximum algorithm iterations'),
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type=QgsProcessingParameterNumber.Integer,
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minValue=1, maxValue=10000, defaultValue=1000)
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max_iterations.setFlags(max_iterations.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
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self.addParameter(max_iterations)
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def name(self):
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return 'orthogonalize'
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def displayName(self):
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return self.tr('Orthogonalize')
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def outputName(self):
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return self.tr('Orthogonalized')
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def inputLayerTypes(self):
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return [QgsProcessing.TypeVectorPolygon, QgsProcessing.TypeVectorLine]
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def prepareAlgorithm(self, parameters, context, feedback):
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self.max_iterations = self.parameterAsInt(parameters, self.MAX_ITERATIONS, context)
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self.angle_tolerance = self.parameterAsDouble(parameters, self.ANGLE_TOLERANCE, context)
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return True
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def processFeature(self, feature, context, feedback):
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input_geometry = feature.geometry()
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if input_geometry:
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output_geometry = input_geometry.orthogonalize(1.0e-8, self.max_iterations, self.angle_tolerance)
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if not output_geometry:
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raise QgsProcessingException(
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self.tr('Error orthogonalizing geometry'))
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feature.setGeometry(output_geometry)
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return [feature]
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