qgsgeometrysimplifier.h

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/***************************************************************************
    qgsgeometrysimplifier.h
    ---------------------
    begin                : December 2013
    copyright            : (C) 2013 by Alvaro Huarte
    email                : http://wiki.osgeo.org/wiki/Alvaro_Huarte
 
 ***************************************************************************
 *                                                                         *
 *   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 QGSGEOMETRYSIMPLIFIER_H
#define QGSGEOMETRYSIMPLIFIER_H
 
#include <QPointF>
#include <QVector>
 
class QgsGeometry;
class QgsRectangle;
class QgsAbstractGeometry;
 
#include "qgis_core.h"
#include "qgis_sip.h"

class CORE_EXPORT QgsAbstractGeometrySimplifier
{
  public:
    virtual ~QgsAbstractGeometrySimplifier() = default;

    virtual QgsGeometry simplify( const QgsGeometry &geometry ) const = 0;

    virtual QgsAbstractGeometry *simplify( const QgsAbstractGeometry *geometry ) const = 0 SIP_FACTORY;
 
    // MapToPixel simplification helper methods
  public:
    static bool isGeneralizableByDeviceBoundingBox( const QgsRectangle &envelope, float mapToPixelTol = 1.0f );
    static bool isGeneralizableByDeviceBoundingBox( const QVector<QPointF> &points, float mapToPixelTol = 1.0f );
};
 
/***************************************************************************/

class CORE_EXPORT QgsTopologyPreservingSimplifier : public QgsAbstractGeometrySimplifier
{
  public:

    QgsTopologyPreservingSimplifier( double tolerance );
 
    QgsGeometry simplify( const QgsGeometry &geometry ) const override;
    QgsAbstractGeometry *simplify( const QgsAbstractGeometry *geometry ) const override SIP_FACTORY;
 
  protected:
    double mTolerance;
 
};
 
#endif // QGSGEOMETRYSIMPLIFIER_H