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Plane.h

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// $Header: /nfs/slac/g/glast/ground/cvs/geometry/geometry/Plane.h,v 1.3 2000/01/18 00:42:07 burnett Exp $
//
//
//

#ifndef __PLANE_H
#define __PLANE_H
#include "geometry/Surface.h"
class Plane: public Surface
{
 public:
   Plane( const Point& origin, const Vector& n );
   Plane( const Point& origin, const Vector& nhat, double dist );


   virtual double how_near( const Point& x ) const;
   virtual double distance( const Point& x, const Vector& v, int inout)const;

   virtual Vector normal( const Point& x )const;

   virtual void reverse();

   virtual Surface& copy()const;

    virtual void setOffset(double offset){ m_d=offset;  };
    virtual double offset()const{return m_d;};
    // distance from origin to the plane


    const char *nameOf() const { return "Plane"; }
    void printOn( std::ostream& os = std::cout ) const;


 private:
    double m_d;    // offset from origin to surface

};


inline double Plane::how_near( const Point& x ) const
{  //  Distance from the point x to the infinite Plane.
   //  The distance will be positive if the point is inside the Plane,
   //  negative if the point is outside.
    return ( m_d + origin()*direction() - x*direction()  );

}

#endif

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