/***************************************************************************************
*****	                   CLASS POINT HEADER                                      *****
****************************************************************************************
** Author: Peter Stuart
** Email:  chester@selway.umt.edu
** Date:   3/7/98
** Description: This class implements a point in 3-space. Operations include all the 
**   necessary conversions from points to vectors, along with basic operators
**
** NOTE: The matrices, vectors, and points use homogeneous coordinates
** 	
***************************************************************************************/

#include <iostream.h>
#include "Vector.hpp"

#ifndef __GGPOINT__
#define __GGPOINT__

#ifndef FALSE
#define FALSE 0
#endif

#ifndef TRUE
#define TRUE !FALSE
#endif

class Point
{
private:
   /* Private Variables:
   _x: x coordinate
   _y: y coordinate
   _z: z coordinate
   */
	
   double _x;
   double _y;
   double _z;

public:
   //Constructor, Copy Constructor, and Destructor
   Point(const double x = 0.0, const double y = 0.0, const double z = 0.0);
   Point(const Point&);
   virtual ~Point();

   // Assignment operator, arithmetic operators, relational operators, and output stream
          Point&   operator =  (const Point&);
   friend Point    operator +  (const Point&, const Vector&);
   friend Point    operator +  (const Vector&, const Point&);
   friend Point	   operator -  (const Point&);
   friend Vector   operator -  (const Point&, const Point&);
   friend Point	   operator -  (const Point&, const Vector&);
   friend Point	   operator *  (const Point&, const double);
   friend Point	   operator *  (const double, const Point&);
   friend Point	   operator /	 (const Point&, const double);
   friend Point	   operator /  (const double, const Point&);

   friend int      operator == (const Point&, const Point&);	
   friend int	   operator != (const Point&, const Point&);
   friend ostream& operator << (ostream&, const Point&);

   // variable access
   double x() const { return _x; };
   double y() const { return _y; };
   double z() const { return _z; };
   void	  x(const double xin) { _x = xin; };
   void	  y(const double yin) { _y = yin; };
   void	  z(const double zin) { _z = zin; };
};

// common point declarations
const Point zeroPoint (0.0, 0.0, 0.0);
const Point xPoint    (1.0, 0.0, 0.0);
const Point yPoint    (0.0, 1.0, 0.0);
const Point zPoint    (0.0, 0.0, 1.0);

#endif