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/*************************************************************************
* Copyright (C) 2009-2014 Tavian Barnes <tavianator@tavianator.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library is free software; you can redistribute it and/ *
* or modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library is distributed in the hope that it will be *
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty *
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
/**
* @file
* Mathematical functions of one variable.
*/
#ifndef DMNSN_MATH_H
#error "Please include <dimension/math.h> instead of this header directly."
#endif
#include <math.h>
#include <stdbool.h>
/** The smallest value considered non-zero by some numerical algorithms. */
#define dmnsn_epsilon 1.0e-10
/**
* @def DMNSN_INFINITY
* Expands to floating-point infinity.
*/
#if defined(INFINITY) || DMNSN_C99
#define DMNSN_INFINITY INFINITY
#else
#define DMNSN_INFINITY HUGE_VAL
#endif
/** Find the minimum of two values. */
DMNSN_INLINE double
dmnsn_min(double a, double b)
{
return a < b ? a : b;
}
/** Find the maximum of two values. */
DMNSN_INLINE double
dmnsn_max(double a, double b)
{
return a > b ? a : b;
}
/** Clamp a value to an interval. */
DMNSN_INLINE double
dmnsn_clamp(double n, double min, double max)
{
return dmnsn_min(dmnsn_max(n, min), max);
}
/** Convert degrees to radians. */
DMNSN_INLINE double
dmnsn_radians(double degrees)
{
return degrees*(atan(1.0)/45.0);
}
/** Convert radians to degrees. */
DMNSN_INLINE double
dmnsn_degrees(double radians)
{
return radians*(45.0/atan(1.0));
}
/** Signum function: return the sign of a value. */
DMNSN_INLINE int
dmnsn_sgn(double n)
{
if (n > 0.0) {
return 1;
} else if (n < 0.0) {
return -1;
} else {
return 0;
}
}
/** Return whether a value is NaN. */
DMNSN_INLINE bool
dmnsn_isnan(double n)
{
#if DMNSN_C99
return isnan(n);
#else
return n != n;
#endif
}
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