unitutils.h

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#ifndef UTILS_UNIT_UTILS_H
#define UTILS_UNIT_UTILS_H
 
#include <math.h>
 
#include "types.h"
 
    // GNU-defined math constants
    #if defined __USE_MISC || defined __USE_XOPEN || defined __APPLE__
    #else
    const floating_point M_E        = 2.71828182845904523540;   /* e */
    const floating_point M_LOG2E    = 1.44269504088896340740;   /* log_2 e */
    const floating_point M_LOG10E   = 0.43429448190325182765;   /* log_10 e */
    const floating_point M_LN2      = 0.69314718055994530942;   /* log_e 2 */
    const floating_point M_LN10     = 2.30258509299404568402;   /* log_e 10 */
    const floating_point M_PI       = 3.14159265358979323846;   /* pi */
    const floating_point M_PI_2     = 1.57079632679489661923;   /* pi/2 */
    const floating_point M_PI_4     = 0.78539816339744830962;   /* pi/4 */
    const floating_point M_1_PI     = 0.31830988618379067154;   /* 1/pi */
    const floating_point M_2_PI     = 0.63661977236758134308;   /* 2/pi */
    const floating_point M_2_SQRTPI = 1.12837916709551257390;   /* 2/sqrt(pi) */
    const floating_point M_SQRT2    = 1.41421356237309504880;   /* sqrt(2) */
    const floating_point M_SQRT1_2  = 0.70710678118654752440;   /* 1/sqrt(2) */
    #endif
 
namespace warpos {
 
    const floating_point TWO_PI = 2.0*M_PI;
 
    // Angle conversion constants
    const floating_point DEGREES_TO_RADIANS = M_PI/180.0;
    const floating_point RADIANS_TO_DEGREES = 180.0/M_PI;
 
    // PHYSICAL CONSTANTS
    const floating_point SPEED_OF_LIGHT = 299792458.0;           // [m/s]
    const floating_point BOLTZMANN_CONSTANT = 1.380649e-23;      // [W/K/Hz]
 
    // DISTANCE CONVERSIONS
    const floating_point AU_TO_METERS = 149597870700.0;
    const floating_point METERS_TO_AU = 1.0/149597870700.0;
 
    const floating_point KM_TO_METERS = 1000.0;
    const floating_point METERS_TO_KM = 0.001;
 
    const floating_point METERS_TO_FEET = 3.28084;
    const floating_point FEET_TO_METERS = 1.0/METERS_TO_FEET;
 
    const floating_point METERS_TO_INCHES = METERS_TO_FEET*12.0;
    const floating_point INCHES_TO_METERS = 1.0/METERS_TO_INCHES;
 
    const double METERS_TO_NAUTICAL_MILES = 1.0/1852.0; // per NIST Special Publication 811: Guide to the SI, Appendix B.9
    
    // MASS CONVERSIONS
    const double LBS_TO_KG = 0.45359237; // per NIST Special Publication 811: Guide to the SI, Appendix B.9
    const double KG_TO_LBS = 1.0 / LBS_TO_KG;
 
    // COMBINED UNIT CONVERSIONS
    // Note: 1 Newton = 1 kg*m*s^2 -> 1 kg*m^2 = 1 N*m*s^2
    const double POUND_FORCE_INCH_SECOND2_TO_METER2_KG = 0.1129848; // per NIST Special Publication 811: Guide to the SI, Appendix B.9, lbf*in -> N*m
 
    // Time conversions
    const floating_point SECONDS_TO_MILLISECONDS = 1000.0;
    const floating_point SECONDS_TO_NANOSECONDS = 1000000000.0;
    const floating_point NANOSECONDS_TO_SECONDS = 1.0 / SECONDS_TO_NANOSECONDS;
    const floating_point MILLISECONDS_TO_NANOSECONDS = 1000000.0;
    const floating_point NANOSECONDS_TO_MILLISECONDS = 1.0 / MILLISECONDS_TO_NANOSECONDS;
    const floating_point SECONDS_TO_MICROSECONDS = 1000000.0;
    const floating_point MICROSECONDS_TO_SECONDS = 1.0 / SECONDS_TO_MICROSECONDS;
    const floating_point MICROSECONDS_TO_NANOSECONDS = 1000.0;
    const floating_point MICROSECONDS_TO_MILLISECONDS = 1.0/1000.0;
    const floating_point MINUTES_TO_SECONDS = 60.0;
    const floating_point SECONDS_TO_MINUTES = 1.0 / MINUTES_TO_SECONDS;
    const floating_point HOURS_TO_SECONDS = MINUTES_TO_SECONDS*MINUTES_TO_SECONDS;
    const floating_point DAYS_TO_SECONDS = 24.0*HOURS_TO_SECONDS;
    const floating_point YEARS_TO_SECONDS = 365.25*DAYS_TO_SECONDS; // TODO: Make this an acutual sidereal year or whatever its called (should be 365.249 or something like that, 2100 is NOT a leap year)
 
    // PRESSURE CONVERSIONS
    const floating_point PSI_TO_PASCAL = 6894.7572932;
    const floating_point PASCAL_TO_PSI = 1.0/PSI_TO_PASCAL;
    const floating_point MILLIBAR_TO_PASCAL = 100.0;
    const floating_point PASCAL_TO_MILLIBAR = 1.0/MILLIBAR_TO_PASCAL;
}
 
#endif