BufferInputLineSimplifier.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2009  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: operation/buffer/BufferInputLineSimplifier.java r320 (JTS-1.12)
 *
 **********************************************************************/
 
#ifndef GEOS_OP_BUFFER_BUFFERINPUTLINESIMPLIFIER_H
#define GEOS_OP_BUFFER_BUFFERINPUTLINESIMPLIFIER_H
 
#include <geos/geom/CoordinateSequence.h> // complete type required
#include <geos/algorithm/CGAlgorithms.h> // for enum
 
#include <memory>
#include <vector> // for composition
 
 
// Forward declarations
namespace geos {
        namespace geom {
                class CoordinateSequence;
                //class PrecisionModel;
        }
}
 
namespace geos {
namespace operation { // geos.operation
namespace buffer { // geos.operation.buffer

class BufferInputLineSimplifier
{
 
public:

        static std::auto_ptr<geom::CoordinateSequence> simplify(
                const geom::CoordinateSequence& inputLine, double distanceTol);
 
        BufferInputLineSimplifier(const geom::CoordinateSequence& input);

        std::auto_ptr<geom::CoordinateSequence> simplify(double distanceTol);
 
private:

        bool deleteShallowConcavities();

        unsigned int findNextNonDeletedIndex(unsigned int index) const;
 
        std::auto_ptr<geom::CoordinateSequence> collapseLine() const;
 
        bool isDeletable(int i0, int i1, int i2, double distanceTol) const;
 
        bool isShallowConcavity(const geom::Coordinate& p0,
                                const geom::Coordinate& p1,
                                const geom::Coordinate& p2,
                                double distanceTol) const;

        bool isShallowSampled(const geom::Coordinate& p0,
                              const geom::Coordinate& p2,
                              int i0, int i2, double distanceTol) const;
 
        bool isShallow(const geom::Coordinate& p0,
                       const geom::Coordinate& p1,
                       const geom::Coordinate& p2,
                       double distanceTol) const;
 
        bool isConcave(const geom::Coordinate& p0,
                       const geom::Coordinate& p1,
                       const geom::Coordinate& p2) const;
 
        static const int NUM_PTS_TO_CHECK = 10;
 
        static const int INIT = 0;
        static const int DELETE = 1;
        static const int KEEP = 1;
 
        const geom::CoordinateSequence& inputLine;
        double distanceTol;
        std::vector<int> isDeleted;
 
        int angleOrientation;
 
    // Declare type as noncopyable
    BufferInputLineSimplifier(const BufferInputLineSimplifier& other);
    BufferInputLineSimplifier& operator=(const BufferInputLineSimplifier& rhs);
};
 
 
} // namespace geos.operation.buffer
} // namespace geos.operation
} // namespace geos
 
 
#endif // ndef GEOS_OP_BUFFER_BUFFERINPUTLINESIMPLIFIER_H