Doca.h

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#ifndef Doca_H
#define Doca_H

#include "geometry/Ray.h"

namespace {
    const Point  p_nullRay(0., 0., 0.);
    const Vector v_nullRay(0., 0., 0.);
    const Ray    nullRay(p_nullRay, v_nullRay);
}
class Doca
{
public:
    Doca(const Ray& ray1, const Ray& ray2=nullRay);
    Doca(const Point& point1, const Vector& vector1,
        const Point& point2=p_nullRay, const Vector& vector2=v_nullRay);
    ~Doca() {}
    
    double docaRay1Ray2()   {return doca;}
    double arcLenRay1()     {return s;}
    double arcLenRay2()     {return t;}
    Point  docaPointRay1();
    Point  docaPointRay2();
    double docaOfPoint(const Point& p);
    
private:
    // stuff common to both constructors
    void ini();
    enum mode {LINELINE, LINEPOINT};
    Point  P;
    Vector u;
    Point  Q;
    Vector v;
    double doca;
    double s;
    double t;
    mode m_mode;
    Point p1;
};

#endif

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