TaggedLineStringSimplifier.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * 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 Licence as published
 * by the Free Software Foundation. 
 * See the COPYING file for more information.
 *
 **********************************************************************
 *
 * Last port: simplify/TaggedLineStringSimplifier.java r536 (JTS-1.12+)
 *
 **********************************************************************
 *
 * NOTES: This class can be optimized to work with vector<Coordinate*>
 *        rather then with CoordinateSequence
 *
 **********************************************************************/
 
#ifndef GEOS_SIMPLIFY_TAGGEDLINESTRINGSIMPLIFIER_H
#define GEOS_SIMPLIFY_TAGGEDLINESTRINGSIMPLIFIER_H
 
#include <geos/export.h>
#include <cstddef>
#include <vector>
#include <memory>
 
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
#endif
 
// Forward declarations
namespace geos {
        namespace algorithm {
                class LineIntersector;
        }
        namespace geom {
                class CoordinateSequence;
                class LineSegment;
        }
        namespace simplify {
                class TaggedLineSegment;
                class TaggedLineString;
                class LineSegmentIndex;
        }
}
 
namespace geos {
namespace simplify { // geos::simplify
 

class GEOS_DLL TaggedLineStringSimplifier {
 
public:
 
        TaggedLineStringSimplifier(LineSegmentIndex* inputIndex,
                LineSegmentIndex* outputIndex);

        void setDistanceTolerance(double d);

        void simplify(TaggedLineString* line);
 
 
private:
 
        // externally owned
        LineSegmentIndex* inputIndex;
 
        // externally owned
        LineSegmentIndex* outputIndex;
 
        std::auto_ptr<algorithm::LineIntersector> li;

        TaggedLineString* line;
 
        const geom::CoordinateSequence* linePts;
 
        double distanceTolerance;
 
        void simplifySection(std::size_t i, std::size_t j,
                        std::size_t depth);
 
        static std::size_t findFurthestPoint(
                        const geom::CoordinateSequence* pts,
                        std::size_t i, std::size_t j,
                        double& maxDistance);
 
        bool hasBadIntersection(const TaggedLineString* parentLine,
                       const std::vector<std::size_t>& sectionIndex,
                       const geom::LineSegment& candidateSeg);
 
        bool hasBadInputIntersection(const TaggedLineString* parentLine,
                       const std::vector<std::size_t>& sectionIndex,
                       const geom::LineSegment& candidateSeg);
 
        bool hasBadOutputIntersection(const geom::LineSegment& candidateSeg);
 
        bool hasInteriorIntersection(const geom::LineSegment& seg0,
                        const geom::LineSegment& seg1) const;
 
        std::auto_ptr<TaggedLineSegment> flatten(
                        std::size_t start, std::size_t end);

        static bool isInLineSection(
                const TaggedLineString* parentLine,
                const std::vector<std::size_t>& sectionIndex,
                const TaggedLineSegment* seg);

        void remove(const TaggedLineString* line,
                        std::size_t start,
                        std::size_t end);
 
};
 
inline void
TaggedLineStringSimplifier::setDistanceTolerance(double d)
{
        distanceTolerance = d;
}
 
} // namespace geos::simplify
} // namespace geos
 
#ifdef _MSC_VER
#pragma warning(pop)
#endif
 
#endif // GEOS_SIMPLIFY_TAGGEDLINESTRINGSIMPLIFIER_H