/*
 *	Data Types
 */
typedef struct {
		double x,y;
	} RealPoint2D;

typedef RealPoint2D Points[4];
typedef double matrix[4][4];

typedef struct {			/* spline curve segment */
	int	degree;
	int	overlap;
	matrix	basis;
} spline;



/*
 *	User-callable functions.
 */
RealPoint2D	GetMouseButtonPush();
void		AddControlPoint( /* RealPoint2D p*/ );
void 		SetUpSpline(/* int s, double subdiv, int style */ );
		/* s: spline type, e.g., CubicCatumullRom */
		/* subdiv: stepsize, e.g., 1.0/16.0 */
		/* style: curve colour style */
void SetEvaluation(/* int t */);
		/* t: curve evaluation mode */

/*
 *	Constants and types relevant to Spline.c.
 */

#ifndef TRUE
#define TRUE  (1==1)
#define FALSE (1==0)
#endif

#define NumberOfSplines		 5
#define Evaluations		 5

/*
 *	Kinds of splines.  You need to add support for CubicBezier and 
 *	CubicLagrange in Spline.c.
 */
#define CubicCatmullRom		1
#define CubicBSpline		2
#define CubicBezier		3
#define CubicLagrange		4

/*
 *	Curve colour style
 */
#define MultiColour		0
#define Black			1

/*
 *	Evaluation Modes:
 *		DirectTM	 multiply TMP every time
 *		DirectMP	 premultiply MP to get A
 *		Horner		 use Horner's rule
 *		ForwardDiff	 use forward differencing
 *		TableLookup	 use table lookup
 */

#define DirectTM	1
#define DirectMP	2
#define Horner		3
#define ForwardDiff	4
#define TableLookup	5

#define SUBDIVISIONS	24
#define	MAXSEG		100

#define abs(x)			( (x) > 0 ? (x) : -(x) )
#define sign(x)			( (x) < 0 ? -1 : 1 )
#define round(x)		( (int)( (x)>=0 ? (x)+0.5 : (x)-0.5 ) )

/*
 *	For Assignment 3.
 */
#define	CheckOff	1
#define	CheckArcLength	2
#define	CheckStrain	3