#ifndef _LIGHT_H
#define _LIGHT_H

//
//  ============================================================
//
//                        Light.h
//
//  ============================================================
//
//
// 	Copyright (C) 1997
//
//			Professor Kenneth I. Joy
//			Computer Science Department
//			University of California
//			Davis, CA  95616
//
// 	Permission is granted to use at your own risk and 
//	distribute this software in source and binary forms 
//	provided the above copyright notice and this paragraph 
//	are preserved on all copies.  This software is provided 
//	"as is" with no express or implied warranty.
//
//
//  ============================================================
//


#include "Point.h"
#include "Color.h"
#include "Transformation.h"

class Light {
   
   private :

			//  Position of the Light Source

	Point		_position ;

			//  Color of the source

	Color 		_diffuse ;				

	

   public:

	      // Constructors

      Light() ;

      Light ( const Point&, const Color& = White ) ;

	     //  Copy Constructor

      Light ( const Light & ) ;

	     //  Destructor ;

      virtual ~Light() ;

	     //  Assignment

      Light& operator= ( const Light & ) ;

	    //  Output

      friend ostream& operator<< ( ostream&, const Light& ) ;
      ostream& output ( ostream& ) const ;

	    // Access Functions

      Point position() const 
		{ return _position ; }

      Color diffuse() const 
		{ return _diffuse ; } ;

      void set_position ( const Point& p )
		{ _position = p ; } ;

      void set_diffuse ( const Color& d )  
		{ _diffuse = d ; } ;

      void GL() const ;
   } ;

#endif