qgsalgorithmpolygonstolines.h

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/***************************************************************************
                         qgsalgorithmpolygontolines.h
                         ---------------------
    begin                : January 2019
    copyright            : (C) 2019 by Matthias Kuhn
    email                : matthias@opengis.ch
 ***************************************************************************/
 
/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSALGORITHMPOLYGONSTOLINES_H
#define QGSALGORITHMPOLYGONSTOLINES_H
 
#define SIP_NO_FILE
 
#include "qgis_sip.h"
#include "qgsprocessingalgorithm.h"
#include "qgsapplication.h"
 
 
class QgsPolygonsToLinesAlgorithm : public QgsProcessingFeatureBasedAlgorithm
{
 
  public:
 
    QgsPolygonsToLinesAlgorithm() = default;
    QIcon icon() const override { return QgsApplication::getThemeIcon( QStringLiteral( "/algorithms/mAlgorithmPolygonToLine.svg" ) ); }
    QString svgIconPath() const override { return QgsApplication::iconPath( QStringLiteral( "/algorithms/mAlgorithmPolygonToLine.svg" ) ); }
    QString name() const override;
    QString displayName() const override;
    QStringList tags() const override;
    QString group() const override;
    QString groupId() const override;
    QString shortHelpString() const override;
    QString shortDescription() const override;
    QgsPolygonsToLinesAlgorithm *createInstance() const override SIP_FACTORY;
    QList<int> inputLayerTypes() const override;
 
  protected:
    QString outputName() const override;
    Qgis::ProcessingSourceType outputLayerType() const override;
    Qgis::WkbType outputWkbType( Qgis::WkbType inputWkbType ) const override;
    QgsFeatureList processFeature( const QgsFeature &feature,  QgsProcessingContext &context, QgsProcessingFeedback *feedback ) override;
 
  private:
    QgsGeometry convertToLines( const QgsGeometry &geometry ) const;
    QList<QgsCurve *> extractRings( const QgsAbstractGeometry *geom ) const;
};
 
 
#endif // QGSALGORITHMPOLYGONSTOLINES_H