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Ray.h

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// $Header: /nfs/slac/g/glast/ground/cvs/geometry/geometry/Ray.h,v 1.4 2001/09/21 18:37:19 atwood Exp $
#ifndef GEOMETRY_RAY_H
#define GEOMETRY_RAY_H

#include "geometry/Point.h"
#include <cfloat> // needed on NT for FLT_MAX

class Ray : public GeomObject
{
public:
  Ray( const Point& p, const Vector& d );
  Ray( const Ray& r );
  // constructor

  virtual Point position( double s ) const ;
  const Point& position() const {return pos;}

  virtual Vector direction( double  ) const{ return dir; }
  const Vector& direction() const {return dir;}

  GeomObject& transform( const CoordTransform & );

  virtual double curvature(double =0) const { return 0.0; }

  virtual double step() const {return FLT_MAX;}

  double getArcLength() const { return arclength; }
  void setArcLength( double s ) { arclength = s; }
  void setFlag( int k ) {flag = k;}
  int  getFlag() const {return flag;} 
  void addArcLength( double ds ) { arclength += ds; }
  // access to internal position

  virtual double distanceOfClosestApproach(const Ray& r) const;
  virtual Vector vectorOfClosestApproach(const Ray& r) const;

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


 protected:
  Point pos;                    // starting point
  Vector dir;                   // direction unit vector
  float arclength;      // length along the Ray to be drawn
  int flag;                     // a flag to be used by clients

};

#endif

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