ScaledNoder.h

/**********************************************************************
 * $Id: ScaledNoder.h 2556 2009-06-06 22:22:28Z strk $
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.refractions.net
 *
 * Copyright (C) 2006      Refractions Research Inc.
 *
 * 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: noding/ScaledNoder.java rev. 1.3 (JTS-1.7.1)
 *
 **********************************************************************/

#ifndef GEOS_NODING_SCALEDNODER_H
#define GEOS_NODING_SCALEDNODER_H

#include <geos/export.h>

#include <cassert>
#include <vector>

#include <geos/inline.h>
#include <geos/noding/Noder.h> // for inheritance
//#include <geos/geom/CoordinateFilter.h> // for inheritance
#include <geos/util.h>

// Forward declarations
namespace geos {
        namespace geom {
                class Coordinate;
                class CoordinateSequence;
        }
        namespace noding {
                class SegmentString;
        }
}

namespace geos {
namespace noding { // geos.noding

class GEOS_DLL ScaledNoder : public Noder { // , public geom::CoordinateFilter { // implements Noder

private:

        Noder& noder;

        double scaleFactor;

        double offsetX;

        double offsetY;

        bool isScaled;

        void rescale(std::vector<SegmentString*>& segStrings) const;

        void scale(std::vector<SegmentString*>& segStrings) const;

        class Scaler;

        class ReScaler;

        friend class ScaledNoder::Scaler;

        friend class ScaledNoder::ReScaler;

        mutable std::vector<geom::CoordinateSequence*> newCoordSeq;

public:

        bool isIntegerPrecision() { return (scaleFactor == 1.0); }

        ScaledNoder(Noder& n, double nScaleFactor,
                        double nOffsetX=0.0, double nOffsetY=0.0)
                :
                noder(n),
                scaleFactor(nScaleFactor),
                offsetX(nOffsetX),
                offsetY(nOffsetY),
                isScaled(nScaleFactor!=1.0)
        {}

        ~ScaledNoder();

        std::vector<SegmentString*>* getNodedSubstrings() const;

        void computeNodes(std::vector<SegmentString*>* inputSegStr);

        //void filter(Coordinate& c);

        void filter_ro(const geom::Coordinate* c)
    {
        UNREFERENCED_PARAMETER(c);
        assert(0);
    }

        void filter_rw(geom::Coordinate* c) const;

};

} // namespace geos.noding
} // namespace geos


//#ifdef GEOS_INLINE
//# include "geos/noding/ScaledNoder.inl"
//#endif

#endif // GEOS_NODING_SCALEDNODER_H

/**********************************************************************
 * $Log$
 * Revision 1.8  2006/06/19 23:33:03  strk
 * Don't *require* CoordinateFilters to define both read-only and read-write methods.
 *
 * Revision 1.7  2006/05/04 06:36:00  strk
 * Extended definition to take new CoordinateSequence tracking into account
 *
 * Revision 1.6  2006/05/03 15:04:33  strk
 * removed reduntant port info
 *
 * Revision 1.5  2006/05/03 15:00:42  strk
 * Fixed scale() function to remove repeated points *after* rounding. Added brief doxygen class description.
 *
 * Revision 1.4  2006/05/03 09:14:22  strk
 * * source/operation/buffer/OffsetCurveSetBuilder.cpp: used auto_ptr to protect leaks of CoordinateSequence
 * * source/noding/ScaledNoder.cpp, source/headers/geos/noding/ScaledNoder.h: ported JTS bugfix in scale method.
 *
 * Revision 1.3  2006/03/24 09:52:41  strk
 * USE_INLINE => GEOS_INLINE
 *
 * Revision 1.2  2006/03/13 21:19:51  strk
 * Fixed bug in ScaledNoder scaling mechanism (hugly code, due to CoordinateSequence visitor pattern design). Tests are still failing so this possibly needs some other fix. Streamlined includes by implementation file.
 *
 * Revision 1.1  2006/03/09 16:46:49  strk
 * geos::geom namespace definition, first pass at headers split
 *
 **********************************************************************/

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