GeometryPrecisionReducer.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2012 Sandro Santilli <strk@keybit.net>
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU Lesser General Public Licence as published
 * by the Free Software Foundation. 
 * See the COPYING file for more information.
 *
 ***********************************************************************
 *
 * Last port: precision/GeometryPrecisionReducer.cpp rev. 1.10 (JTS-1.7)
 *
 **********************************************************************/
 
#ifndef GEOS_PRECISION_GEOMETRYPRECISIONREDUCER_H
#define GEOS_PRECISION_GEOMETRYPRECISIONREDUCER_H
 
#include <geos/export.h>
#include <geos/geom/GeometryFactory.h> // for GeometryFactory::unique_ptr
#include <memory> // for auto_ptr
 
// Forward declarations
namespace geos {
  namespace geom { 
    class PrecisionModel;
    class GeometryFactory;
    class Geometry;
  }
}
 
namespace geos {
namespace precision { // geos.precision

class GEOS_DLL GeometryPrecisionReducer {
 
private:
 
  // Externally owned
  const geom::GeometryFactory *newFactory;
 
  const geom::PrecisionModel &targetPM;
 
  bool removeCollapsed;
 
  bool isPointwise;
 
  std::auto_ptr<geom::Geometry> reducePointwise( const geom::Geometry& geom );
 
  std::auto_ptr<geom::Geometry> fixPolygonalTopology(
                                                 const geom::Geometry& geom );
 
  geom::GeometryFactory::unique_ptr createFactory(
                                          const geom::GeometryFactory& oldGF,
                                          const geom::PrecisionModel& newPM );
 
  GeometryPrecisionReducer(GeometryPrecisionReducer const&); /*= delete*/
  GeometryPrecisionReducer& operator=(GeometryPrecisionReducer const&); /*= delete*/
 
public:

  static std::auto_ptr<geom::Geometry> reduce(
                                const geom::Geometry &g,
                                const geom::PrecisionModel &precModel )
  {
    GeometryPrecisionReducer reducer(precModel);
    return reducer.reduce(g);
  }

  static std::auto_ptr<geom::Geometry> reducePointwise(
                                const geom::Geometry &g,
                                const geom::PrecisionModel &precModel )
  {
    GeometryPrecisionReducer reducer(precModel);
    reducer.setPointwise(true);
    return reducer.reduce(g);
  }
 
  GeometryPrecisionReducer(const geom::PrecisionModel &pm)
      :
      newFactory(0),
      targetPM(pm),
      removeCollapsed(true),
      isPointwise(false)
  {}

  GeometryPrecisionReducer(const geom::GeometryFactory &gf);

  void setRemoveCollapsedComponents(bool remove) {
    removeCollapsed = remove;
  }

  void setPointwise(bool pointwise)
  {
    isPointwise = pointwise;
  }
 
  std::auto_ptr<geom::Geometry> reduce(const geom::Geometry& geom);
 
};
 
} // namespace geos.precision
} // namespace geos
 
#endif // GEOS_PRECISION_GEOMETRYPRECISIONREDUCER_H