// Game Boy Advance library for Logic Machines F'05
// Version 6, November 16th, 2005

#ifndef __GBAMATH__
#define __GBAMATH__


typedef long real;

#define REAL_SHIFT		10
#define REAL_SCALE		1024

#define REAL(n)			((n) * REAL_SCALE)
#define INT(n)			((n) / REAL_SCALE)
#define FRAC(n)			((n) & (REAL_SCALE-1))
#define FLOAT(n)		((float)(n) / REAL_SCALE)

#define mulr(a, b)		(((long long)(a) * (long long)(b)) >> REAL_SHIFT)
#define divr(a, b)		(((long long)(a) << REAL_SHIFT) / (long long)(b))


// all angles in gbamath are in degrees. hurray
real sqrtr(real x);
real asinr(real x);
real absr(real x);
real sinr(real a);
real cosr(real a);


typedef struct {
	real x, y;
} realpoint;

real GetDistanceBetweenPoints(realpoint *pointOne, realpoint *pointTwo);
real GetAngleBetweenPoints(realpoint *pointOne, realpoint *pointTwo);
real NormalizeAngle(real angle);
real ChaseAngle(real targetAngle, real currentAngle, real degreesToRotate);
real GetDeltaBetweenAngles(real angleOne, real angleTwo);


typedef struct {

	real magnitude;
	real direction;

	real lastDirection;
	real cos, sin;

} vector;

void InitVector(vector *theVector);
void MovePointUsingVector(realpoint *sourcePoint, vector *theVector);
void AddVectors(vector *resultVector, vector *theVector);
real GetXComponentOfVector(vector *theVector);
real GetYComponentOfVector(vector *theVector);
void CollideVectors(vector *v1, vector *v2);
void CreateVectorFromPoint(vector *resultVector, realpoint *point);
void AccelerateVector(vector *theVector, vector *theAcceleration, real maxMagnitude);
real AccelerateQuantity(real theQuantity, real theAcceleration, real maxQuantity);

#endif