//=======================================================================//
// File:		line.hpp                                                     //
// Project: Architecture                                                 //
// Author:	J.M. Albertson                                               //
//-----------------------------------------------------------------------//
// Copyright (C) 1994-1995, Virtual World Entertainments,                //
// PROPRIETARY AND CONFIDENTIAL                                          //
//=======================================================================//

#if !defined(LINE_HPP)
#	define LINE_HPP

#	if !defined(RAY_HPP)
#		include <ray.hpp>
#	endif

	//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Line3D ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

	class Line:
		public Ray
	{
	 public:
		Scalar
			length;

		Line() {}
		Line(
			const Ray &ray,
			Scalar length
		):
			Ray(ray),
			length(length)
		{}
		Line(
			const Point3D &start,
			const UnitVector &direction,
			Scalar length
		):
			Ray(start,direction),
			length(length)
		{}

		void
			FindEnd(Point3D *result)
				{Check(this); Check_Pointer(result); Ray::Project(length, result);}
			
		//
		// Assignment operators
		//
		Line&
			operator=(const Vector3D &vector);
		Line&
			operator=(const Point3D &point);
		//
		// Ray intersection functions
		//
		Scalar
			DistanceTo(
				const Plane &plane,
				Scalar *product
			) const;
		Scalar
			DistanceTo(
				const Sphere &sphere,
				Scalar *penetration
			) const;

	};

#endif