/* Circle.h 
	Circle class
  Original code: JM, Mar 31, 1998
*/

#ifndef TRUE
#define TRUE	1
#define FALSE 0
#endif

#ifndef EPS
#define EPS	1.0e-8
#endif

#ifndef CIRCLE_H
#define CIRCLE_H

#include "Point.h"

typedef struct circle *Circle;

Circle ConsCircle( Point origin, double radius );
/* Construct a circle from its origin and radius 
   Pre-cond: origin != NULL && radius > 0
   Post-cond: returns a valid circle or NULL if no memory
*/

void DeleteCircle( Circle c );
/* Delete c and free resources 
   Pre-cond: c != NULL
*/

Point Origin( Circle c );
double Radius( Circle c );
/* Return the origin and radius of a circle c
   Pre-cond: c != NULL
*/

int PointInCircle( Circle c, Point p );
/* Return TRUE if point p lies inside circle c 
   Pre-cond: c != NULL && p != NULL
*/


#endif