ExactMaxInscribedCircle.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (c) 2020 Martin Davis
 * Copyright (C) 2020 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.
 *
 **********************************************************************
 *
 * Last port: algorithm/construct/ExactMaxInscribedCircle.java
 * https://github.com/locationtech/jts/commit/8d5ced1b784d232e1eecf5df4b71873e8822336a
 *
 **********************************************************************/
 
#pragma once
 
#include <geos/geom/Coordinate.h>
#include <geos/geom/LineSegment.h>
 
#include <array>
// #include <queue>
 
 
 
namespace geos {
namespace geom {
class CoordinateSequence;
class Geometry;
class Polygon;
}
}
 
namespace geos {
namespace algorithm { // geos::algorithm
namespace construct { // geos::algorithm::construct

class GEOS_DLL ExactMaxInscribedCircle {
 
    using CoordinateSequence = geos::geom::CoordinateSequence;
    using CoordinateXY = geos::geom::CoordinateXY;
    using LineSegment = geos::geom::LineSegment;
    using Polygon = geos::geom::Polygon;
 
public:
 
    ExactMaxInscribedCircle();

    static bool isSupported(const geom::Geometry* geom);
 
    static std::pair<CoordinateXY, CoordinateXY> computeRadius(const Polygon* polygon);
 
 
private:
 
    static bool isTriangle(const Polygon* polygon);
 
    static bool isQuadrilateral(const Polygon* polygon);
 
    static std::pair<CoordinateXY, CoordinateXY> computeTriangle(const CoordinateSequence* ring);

    static std::pair<CoordinateXY, CoordinateXY> computeConvexQuadrilateral(const CoordinateSequence* ring);
 
    static std::array<LineSegment, 4> computeBisectors(const CoordinateSequence* ptsCW,
                                                       double diameter);
 
    static CoordinateXY nearestEdgePt(const CoordinateSequence* ring,
                                      const CoordinateXY& pt);
 
    static LineSegment computeConvexBisector(const CoordinateSequence* pts,
                                             std::size_t index, double len);
 
    static bool isConvex(const Polygon* polygon);
 
    static bool isConvex(const CoordinateSequence* ring);
 
    static bool isConcave(const CoordinateXY& p0,
                          const CoordinateXY& p1,
                          const CoordinateXY& p2);
 
    static bool isPointInConvexRing(const CoordinateSequence* ringCW,
                                const CoordinateXY& p);
 
};
 
 
} // geos::algorithm::construct
} // geos::algorithm
} // geos