HotPixel.h

/**********************************************************************
 * $Id: HotPixel.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/snapround/HotPixel.java rev. 1.3 (JTS-1.9)
 *
 **********************************************************************/

#ifndef GEOS_NODING_SNAPROUND_HOTPIXEL_H
#define GEOS_NODING_SNAPROUND_HOTPIXEL_H

#include <geos/export.h>

#include <geos/inline.h>

#include <geos/geom/Coordinate.h> // for composition
#include <geos/geom/Envelope.h> // for auto_ptr

// Forward declarations
namespace geos {
        namespace geom {
                class Envelope;
        }
        namespace algorithm {
                class LineIntersector;
        }
        namespace noding {
                class NodedSegmentString;
        }
}

namespace geos {
namespace noding { // geos::noding
namespace snapround { // geos::noding::snapround

class GEOS_DLL HotPixel {

private:

        algorithm::LineIntersector& li;

        geom::Coordinate pt;
        const geom::Coordinate& originalPt;
        geom::Coordinate ptScaled;

        mutable geom::Coordinate p0Scaled;
        mutable geom::Coordinate p1Scaled;

        double scaleFactor;

        double minx;
        double maxx;
        double miny;
        double maxy;

        std::vector<geom::Coordinate> corner;

        mutable std::auto_ptr<geom::Envelope> safeEnv; 

        void initCorners(const geom::Coordinate& pt);

        double scale(double val) const;

        void copyScaled(const geom::Coordinate& p,
                        geom::Coordinate& pScaled) const;

        bool intersectsToleranceSquare(const geom::Coordinate& p0,
                        const geom::Coordinate& p1) const;
 

        bool intersectsPixelClosure(const geom::Coordinate& p0,
                        const geom::Coordinate& p1);
 
public:

        HotPixel(const geom::Coordinate& pt,
                        double scaleFact,
                        algorithm::LineIntersector& li);

        const geom::Coordinate& getCoordinate() const { return originalPt; }

        const geom::Envelope& getSafeEnvelope() const;

        bool intersectsScaled(const geom::Coordinate& p0,
                        const geom::Coordinate& p1) const;

        bool intersects(const geom::Coordinate& p0,
                        const geom::Coordinate& p1) const;
 
        bool addSnappedNode(NodedSegmentString& segStr, size_t segIndex);

};



} // namespace geos::noding::snapround
} // namespace geos::noding
} // namespace geos

#ifdef GEOS_INLINE
# include "geos/noding/snapround/HotPixel.inl"
#endif

#endif // GEOS_NODING_SNAPROUND_HOTPIXEL_H

/**********************************************************************
 * $Log$
 * Revision 1.3  2006/05/03 17:50:49  strk
 * Doxygen comments
 *
 * Revision 1.2  2006/03/24 09:52:41  strk
 * USE_INLINE => GEOS_INLINE
 *
 * Revision 1.1  2006/03/14 12:55:56  strk
 * Headers split: geomgraphindex.h, nodingSnapround.h
 *
 **********************************************************************/

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