SegmentString.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2011      Sandro Santilli <strk@kbt.io>
 * Copyright (C) 2005-2006 Refractions Research Inc.
 * Copyright (C) 2001-2002 Vivid Solutions 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/SegmentString.java r430 (JTS-1.12+)
 *
 **********************************************************************/
 
#pragma once
 
#include <geos/export.h>
#include <geos/geom/Coordinate.h>
#include <geos/geom/CoordinateSequence.h>
#include <geos/noding/Octant.h>
 
#include <vector>
 
// Forward declarations
namespace geos {
namespace algorithm {
class LineIntersector;
}
}
 
namespace geos {
namespace noding { // geos.noding
 
class GEOS_DLL SegmentString {
public:
    typedef std::vector<const SegmentString*> ConstVect;
    typedef std::vector<SegmentString*> NonConstVect;
 
    friend std::ostream& operator<< (std::ostream& os,
                                     const SegmentString& ss);
 
    SegmentString(const void* newContext, geom::CoordinateSequence* newSeq)
        :
        seq(newSeq),
        context(newContext)
    {}
 
    virtual
    ~SegmentString() {}
 
    const void*
    getData() const
    {
        return context;
    }
 
    void
    setData(const void* data)
    {
        context = data;
    }
 
    std::size_t size() const {
        return seq->size();
    }
 
    template<typename CoordType = geom::Coordinate>
    const CoordType& getCoordinate(std::size_t i) const {
        return seq->getAt<CoordType>(i);
    }
 
    const geom::CoordinateSequence* getCoordinates() const {
        return seq;
    }
 
    geom::CoordinateSequence* getCoordinates() {
        return seq;
    }
 
    int getSegmentOctant(std::size_t index) const
    {
        if (index >= size() - 1) {
            return -1;
        }
        return safeOctant(seq->getAt<geom::CoordinateXY>(index),
                          seq->getAt<geom::CoordinateXY>(index + 1));
    };
 
    static int getSegmentOctant(const SegmentString& ss, std::size_t index) {
        return ss.getSegmentOctant(index);
    }
 
    const geom::CoordinateXY& nextInRing(std::size_t index) const
    {
        std::size_t nextIndex = index + 1;
        if (nextIndex > size() - 1) {
            nextIndex = 1;
        }
        return getCoordinate(nextIndex);
    }
 
    const geom::CoordinateXY& prevInRing(std::size_t index) const
    {
        std::size_t prevIndex;
        if (index == 0)
            prevIndex = size() - 2;
        else
            prevIndex = index - 1;
        return getCoordinate( prevIndex );
    }
 
 
    bool isClosed() const {
        return seq->front<geom::CoordinateXY>().equals(seq->back<geom::CoordinateXY>());
    }
 
    virtual std::ostream& print(std::ostream& os) const;
 
protected:
    geom::CoordinateSequence* seq;
 
private:
    const void* context;
 
    static int safeOctant(const geom::CoordinateXY& p0, const geom::CoordinateXY& p1)
    {
        if(p0.equals2D(p1)) {
            return 0;
        }
        return Octant::octant(p0, p1);
    };
 
    // Declare type as noncopyable
    SegmentString(const SegmentString& other) = delete;
    SegmentString& operator=(const SegmentString& rhs) = delete;
};
 
std::ostream& operator<< (std::ostream& os, const SegmentString& ss);
 
} // namespace geos.noding
} // namespace geos