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 "qgsgeometry.h"

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

    virtual QgsGeometry* simplify( QgsGeometry* geometry ) const = 0;
    virtual bool simplifyGeometry( QgsGeometry* geometry ) const = 0;

    // 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 );
    virtual ~QgsTopologyPreservingSimplifier();

  protected:
    double mTolerance;

  public:
    virtual QgsGeometry* simplify( QgsGeometry* geometry ) const;
    virtual bool simplifyGeometry( QgsGeometry* geometry ) const;
};

#endif // QGSGEOMETRYSIMPLIFIER_H