118 lines
5.5 KiB
C
118 lines
5.5 KiB
C
/* +++Date last modified: 05-Jul-1997 */
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/******************************************************/
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/* Filespec : triglib.c triglib.h */
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/* Date : February 21 1997 */
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/* Time : 14:11 */
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/* Revision : 1.0C */
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/* Update : */
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/******************************************************/
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/* Programmer: Nigel Traves */
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/* Address : 5 Breamer Road, Collingham, Newark, */
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/* : Notts, U.K. */
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/* Post Code : NG23 7PN */
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/******************************************************/
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/* Released to the Public Domain */
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/******************************************************/
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#ifndef TRIGLIB_H
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#define TRIGLIB_H
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/********************************************************************/
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/* This library is concerned entirely with angles in general and */
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/* trigonometric functions in particular. */
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/********************************************************************/
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#ifndef ANGLE_TYPE
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#define ANGLE_TYPE
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enum angle_type {RAD, DEG, GRAD};
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#endif
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/********************************************************************/
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/* The following three routines 'normalize' the supplied angle to */
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/* be within limits appropiate for the trigonemetric routines. */
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/* normalize_radians ensures that the supplied angle is between -PI */
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/* and +PI, normalize_degrees between -180.0 and +180.0 and */
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/* normalize_grade between -200.0 and +200.0. NOTE - ALL the */
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/* normal trigonometric functions normalize the angle before use, */
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/* and the inverse functions after. */
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/********************************************************************/
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void normalize_radians(double *radians);
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void normalize_degrees(double *degrees);
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void normalize_grade(double *grade);
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/********************************************************************/
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/* These six routines enable conversion, of angles, between */
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/* radians, degrees and grade. NOTE there is no need to normalize */
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/* the angle to be converted before calling any of these routines */
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/* as they all call the appropriate normalisation routine. */
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/********************************************************************/
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double radians_to_degrees(double radians);
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double radians_to_grade(double radians);
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double degrees_to_radians(double degrees);
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double degrees_to_grade(double degrees);
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double grade_to_radians(double grade);
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double grade_to_degrees(double grade);
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/********************************************************************/
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/* The following six routines are the normal trigonometric */
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/* functions. */
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/********************************************************************/
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double sine(double angle, enum angle_type atype);
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double cosine(double angle, enum angle_type atype);
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double tangent(double angle, enum angle_type atype);
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double secant(double angle, enum angle_type atype);
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double cosecant(double angle, enum angle_type atype);
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double cotangent(double angle, enum angle_type atype);
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/********************************************************************/
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/* The following six routines are the normal inverse trigonometric */
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/* functions. */
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/********************************************************************/
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double arc_sine(double x, enum angle_type outtype);
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double arc_cosine(double x, enum angle_type outtype);
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double arc_tangent(double x, enum angle_type outtype);
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double arc_secant(double x, enum angle_type outtype);
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double arc_cosecant(double x, enum angle_type outtype);
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double arc_cotangent(double x, enum angle_type outtype);
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/********************************************************************/
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/* The following six routines are the hyperbolic trigonometric */
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/* functions. */
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/********************************************************************/
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double hyperbolic_sine(double angle, enum angle_type atype);
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double hyperbolic_cosine(double angle, enum angle_type atype);
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double hyperbolic_tangent(double angle, enum angle_type atype);
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double hyperbolic_secant(double angle, enum angle_type atype);
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double hyperbolic_cosecant(double angle, enum angle_type atype);
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double hyperbolic_cotangent(double angle, enum angle_type atype);
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/********************************************************************/
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/* The following six routines are the hyperbolic inverse */
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/* trigonometric functions. */
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/********************************************************************/
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double hyperbolic_arc_sine(double x, enum angle_type outtype);
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double hyperbolic_arc_cosine(double x, enum angle_type outtype);
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double hyperbolic_arc_tangent(double x, enum angle_type outtype);
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double hyperbolic_arc_secant(double x, enum angle_type outtype);
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double hyperbolic_arc_cosecant(double x, enum angle_type outtype);
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double hyperbolic_arc_cotangent(double x, enum angle_type outtype);
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/********************************************************************/
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/* The following four routines "complete" the standard library */
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/* functions. */
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/********************************************************************/
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double sech(double x);
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double csch(double x);
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double coth(double x);
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double acoth(double x);
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#endif
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