HullTri.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2021 Paul Ramsey <pramsey@cleverelephant.ca>
 *
 * 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.
 *
 **********************************************************************/
 
#pragma once
 
#include <geos/geom/Triangle.h>
#include <geos/triangulate/tri/Tri.h>
#include <geos/triangulate/tri/TriList.h>
#include <geos/triangulate/quadedge/TriangleVisitor.h>
 
#include <queue>
#include <deque>
 
 
namespace geos {
namespace geom {
class Coordinate;
}
namespace triangulate {
namespace quadedge {
}
}
}
 
using geos::geom::Coordinate;
using geos::geom::Triangle;
using geos::triangulate::tri::Tri;
using geos::triangulate::tri::TriList;
 
namespace geos {
namespace algorithm { // geos::algorithm
namespace hull {      // geos::algorithm::hull
 
 
 
class HullTri : public Tri
{
    private:
 
        double m_size;
        bool m_isMarked = false;
 
        bool isBoundaryTouch(TriIndex index) const;
 
 
    public:
 
        HullTri(const Coordinate& c0, const Coordinate& c1, const Coordinate& c2)
            : Tri(c0, c1, c2)
            , m_size(Triangle::longestSideLength(c0, c1, c2))
            {};
 
        class HullTriCompare {
            public:
                HullTriCompare() {};
                bool operator()(const HullTri* a, const HullTri* b)
                {
                    if (a->getSize() == b->getSize())
                        return a->getArea() < b->getArea();
                    else
                        return a->getSize() < b->getSize();
                }
        };
 
 
        double getSize() const;
 
        void setSizeToBoundary();
 
        void setSizeToLongestEdge();
        void setSizeToCircumradius();
 
 
        bool isMarked() const;
        void setMarked(bool marked);
        bool isRemoved();
        TriIndex boundaryIndex() const;
        TriIndex boundaryIndexCCW() const;
        TriIndex boundaryIndexCW() const;
 
        bool isConnecting() const;
 
        int adjacent2VertexIndex() const;
 
        TriIndex isolatedVertexIndex(TriList<HullTri>& triList) const;
 
        double lengthOfLongestEdge() const;
 
        bool hasBoundaryTouch() const;
 
        static HullTri* findTri(TriList<HullTri>& triList, Tri* exceptTri);
        static bool isAllMarked(TriList<HullTri>& triList);
        static void clearMarks(TriList<HullTri>& triList);
        static void markConnected(HullTri* triStart, HullTri* exceptTri);
        static bool isConnected(TriList<HullTri>& triList, HullTri* exceptTri);
 
        friend std::ostream& operator<<(std::ostream& os, const HullTri& ht);
 
        double lengthOfBoundary() const;
 
        void remove(TriList<HullTri>& triList);
 
 
}; // HullTri
 
 
 
 
 
 
} // geos::algorithm::hull
} // geos::algorithm
} // geos