67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
/*
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* units.h - some conversion definitions
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*
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* Copyright (C) 1992-2011 jean-pierre.charras
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* Copyright (C) 1992-2011 Kicad Developers, see change_log.txt for contributors.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this package; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef __UNITS_H
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#define __UNITS_H
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#include <config.h>
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#include <cmath>
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#include "units_scales.h"
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#ifndef HAVE_CMATH_ASINH
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inline double asinh( double x )
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{
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if( x==0.0 ) return sqrt( -1.0 );
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return log( x+sqrt(x*x+1) );
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}
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#endif
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#ifndef HAVE_CMATH_ACOSH
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inline double acosh( double x )
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{
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// must be x>=1, if not return Nan (Not a Number)
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if( !(x>=1.0) ) return sqrt( -1.0 );
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// return only the positive result (as sqrt does).
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return log( x+sqrt(x*x-1.0) );
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}
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#endif
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#ifndef HAVE_CMATH_ATANH
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inline double atanh( double x )
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{
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// must be x>-1, x<1, if not return Nan (Not a Number)
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if( !(x>-1.0 && x<1.0) ) return sqrt( -1.0 );
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return log( (1.0+x)/(1.0-x) ) / 2.0;
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}
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#endif
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#define MU0 12.566370614e-7 // magnetic constant
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#define C0 299792458.0 // speed of light in vacuum
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#define ZF0 376.73031346958504364963 // wave resistance in vacuum
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#endif /* __UNITS_H */
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