trig.h File Reference

#include <stdint.h>

Macros
#define	TRIG_MAX_RATIO   0xffff
	The largest value that can result from a call to sin_lookup or cos_lookup.
#define	TRIG_MAX_ANGLE   0x10000
	Angle value that corresponds to 360 degrees or 2 PI radians.
#define	TRIG_PI   0x8000
	Angle value that corresponds to 180 degrees or PI radians.
#define	TRIG_FP   16
	Number of fractional bits of the fixed-point ratio used by atan2_lookup().
#define	TRIGANGLE_TO_DEG(trig_angle)   (((trig_angle) * 360) / TRIG_MAX_ANGLE)
	Converts from a fixed point value representation to the equivalent value in degrees.
#define	DEG_TO_TRIGANGLE(angle)   (((angle) * TRIG_MAX_ANGLE) / 360)
	Converts from an angle in degrees to the equivalent fixed point value representation.

Functions
int32_t	sin_lookup (int32_t angle)
	Look-up the sine of the given angle from a pre-computed table.
int32_t	cos_lookup (int32_t angle)
	Look-up the cosine of the given angle from a pre-computed table.
int32_t	atan2_lookup (int16_t y, int16_t x)
	Look-up the arctangent of a given x, y pair.
uint32_t	normalize_angle (int32_t angle)
	Normalize an angle to the range [0, TRIG_MAX_ANGLE].