68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
/*
|
|
* units.h - some conversion definitions
|
|
*
|
|
* Copyright (C) 1992-2011 jean-pierre.charras
|
|
* Copyright (C) 1992-2011 Kicad Developers, see change_log.txt for contributors.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this package; see the file COPYING. If not, write to
|
|
* the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
|
|
* Boston, MA 02110-1301, USA.
|
|
*
|
|
*/
|
|
|
|
#ifndef __UNITS_H
|
|
#define __UNITS_H
|
|
|
|
#include <config.h>
|
|
#include <cmath>
|
|
|
|
#include "units_scales.h"
|
|
|
|
#ifndef HAVE_CMATH_ASINH
|
|
inline double asinh( double x )
|
|
{
|
|
return log( x+sqrt(x*x+1) );
|
|
}
|
|
#endif
|
|
|
|
#ifndef HAVE_CMATH_ACOSH
|
|
inline double acosh( double x )
|
|
{
|
|
// must be x>=1, if not return Nan (Not a Number)
|
|
if( x < 1.0 ) return sqrt( -1.0 );
|
|
|
|
// return only the positive result (as sqrt does).
|
|
return log( x+sqrt( x*x-1.0 ) );
|
|
}
|
|
#endif
|
|
|
|
#ifndef HAVE_CMATH_ATANH
|
|
inline double atanh( double x )
|
|
{
|
|
// must be x>-1, x<1, if not return Nan (Not a Number)
|
|
if( !(x>-1.0 && x<1.0) ) return sqrt( -1.0 );
|
|
|
|
return log( (1.0+x)/(1.0-x) ) / 2.0;
|
|
}
|
|
#endif
|
|
|
|
#define MU0 12.566370614e-7 // magnetic constant
|
|
#define C0 299792458.0 // speed of light in vacuum
|
|
#define ZF0 376.730313668 // wave resistance in vacuum
|
|
|
|
// ZF0 value update:
|
|
// https://physics.nist.gov/cgi-bin/cuu/Value?z0
|
|
|
|
#endif /* __UNITS_H */
|