/*
                           ShipWars Universe Math
 */

#ifndef UNVMATH_H
#define UNVMATH_H

#include <sys/types.h>
#include "objects.h"


typedef struct _sw_units_struct			sw_units_struct;


/*
 *	Units:
 */
struct _sw_units_struct {

        float		ru_to_au;		/* SW real units to
                                                 * astronomical units */
};


/* Conversion */
extern float RADTODEG(const float radians);
extern float DEGTORAD(const float degrees);
extern float SANITIZERADIANS(const float radians);
extern float SANITIZEDEGREES(const float degrees);

extern float SWConvertRUToAU(sw_units_struct *units, const float x);
extern float SWConvertRUToKM(sw_units_struct *units, const float x);
extern float SWConvertRUToMiles(sw_units_struct *units, const float x);
extern float SWConvertRUToKiloMiles(sw_units_struct *units, const float x);
extern float SWConvertRUToLY(sw_units_struct *units, const float x);
extern float SWConvertRUToParsecs(sw_units_struct *units, const float x);
extern float SWConvertRUToMP(sw_units_struct *units, const float x);
extern float SWConvertRUToSU(sw_units_struct *units, const float x);

extern float SWConvertRUPerCycleToRUPerSecond(
	sw_units_struct *units, const float x
);
extern float SWConvertRUPerCycleToAUPerSecond(
	sw_units_struct *units, const float x
);
extern float SWConvertRUPerCycleToKMPerSecond(
	sw_units_struct *units, const float x
);
extern float SWConvertRUPerCycleToMilesPerSecond(
	sw_units_struct *units, const float x
);
extern float SWConvertRUPerCycleToKiloMilesPerSecond(
	sw_units_struct *units, const float x
);
extern float SWConvertRUPerCycleToMPPerSecond(
	sw_units_struct *units, const float x
);

/* Polar To Coordinate Conversion */
extern float SWMathRectangularToPolarX(const float theta, const float r);
extern float SWMathRectangularToPolarY(const float theta, const float r);

/* Vector Unitlization */
extern void SWMathSetUnitVector2D(
	sw_vector_compoent_struct *v,
	const float bearing
);
extern void SWMathSetUnitVector3D(
	sw_vector_compoent_struct *v,
	const float bearing, const float pitch
);

/* Angle & Vector Calculations */
extern float SWMathAngleDelta(const float theta_to, const float theta_cur);
extern void SWMathVectorAdd(
	const float v1_dir, const float v1_mag,
	const float v2_dir, const float v2_mag,
	float *v_dir_rtn, float *v_mag_rtn
);
extern float SWMathCoordinateDeltaVector(const float dx, const float dy);

/* 3D Distance */
extern float SWMath3DDistance(
	const float dx, const float dy, const float dz
);

/* Sector Checking */
extern int SWMath3DInSectorPtr(
	xsw_object_struct *obj_ptr,
	const long sect_x, const long sect_y, const long sect_z
);
extern int SWMath3DInSameSector(
	xsw_object_struct **xsw_object, const int total_objects,
	const int obj_num1, const int obj_num2
);
extern int SWMath3DInSameSectorPtr(
	xsw_object_struct *obj1, xsw_object_struct *obj2
);

/* Spherical Contact */
extern int SWMath3DInContact(
	xsw_object_struct **xsw_object, const int total_objects,
	const int obj_num1, const int obj_num2
);
extern int SWMath3DInContactPtr(
	xsw_object_struct *obj1, xsw_object_struct *obj2
);

/* Vector Contact */
extern int SWMath3DInVectorContact(
	xsw_object_struct **xsw_object, const int total_objects,
	const int obj_num1, const int obj_num2,
	const float heading,		/* Object 1 to object 2 */
	const float heading_variance,
	const float range		/* In screen units */
);

/* Range Contact */
extern int SWMath3DInRange(
	xsw_object_struct **xsw_object, const int total_objects,
	const int obj_num1, const int obj_num2,
	const float distance		/* In real units */
);
extern int SWMath3DInRangePtr(
        xsw_object_struct *obj, xsw_object_struct *tar_obj,
	const float distance		/* In real units */
);

/* Maximum range by velocity and time */
extern float SWMathMaxRangeByVelocity(const float v_max, const time_t t_ms);


#endif	/* UNVMATH_H */