/// math.h provides certain useful mathematical functions.
#ifndef __WRMATH_UTIL_MATH_H
#define __WRMATH_UTIL_MATH_H


#include <cmath>


namespace wr {
namespace math {


/// Convert radians to degrees.
/// @param rads the angle in radians
/// @return the angle in degrees.
float	RadiansToDegreesF(float rads);

/// Convert radians to degrees.
/// @param rads the angle in radians
/// @return the angle in degrees.
double	RadiansToDegreesD(double rads);

/// Convert degrees to radians.
/// @param degrees the angle in degrees
/// @return the angle in radians.
float	DegreesToRadiansF(float degrees);

/// Convert degrees to radians.
/// @param degrees the angle in degrees
/// @return the angle in radians.
double	DegreesToRadiansD(double degrees);


/// Get the default epsilon value.
/// @param epsilon The variable to store the epsilon value in.
void	DefaultEpsilon(double &epsilon);

/// Get the default epsilon value.
/// @param epsilon The variable to store the epsilon value in.
void	DefaultEpsilon(float &epsilon);


/// Return whether the two values of type T are equal to within some tolerance.
/// @tparam T The type of value
/// @param a A value of type T used as the left-hand side of an equality check.
/// @param b A value of type T used as the right-hand side of an equality check.
/// @param epsilon The tolerance value.
/// @return Whether the two values are "close enough" to be considered equal.
template <typename T>
static T
WithinTolerance(T a, T b, T epsilon)
{
	return std::abs(a - b) < epsilon;
}


} // namespace math
} // namespace wr


#endif // __WRMATH_UTIL_MATH_H