BufferInputLineSimplifier.h

Go to the documentation of this file.

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2009  Sandro Santilli <strk@kbt.io>
 *
 * 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 <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::unique_ptr<geom::CoordinateSequence> simplify(
        const geom::CoordinateSequence& inputLine, double distanceTol);

    BufferInputLineSimplifier(const geom::CoordinateSequence& input);

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

private:

    bool deleteShallowConcavities();

    size_t findNextNonDeletedIndex(size_t index) const;

    std::unique_ptr<geom::CoordinateSequence> collapseLine() const;

    bool isDeletable(size_t i0, size_t i1, size_t 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,
                          size_t i0, size_t 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) = delete;
    BufferInputLineSimplifier& operator=(const BufferInputLineSimplifier& rhs) = delete;
};


} // namespace geos.operation.buffer
} // namespace geos.operation
} // namespace geos


#endif // ndef GEOS_OP_BUFFER_BUFFERINPUTLINESIMPLIFIER_H