62 lines
1.8 KiB
C++
62 lines
1.8 KiB
C++
/*
|
|
* This program source code file is part of KICAD, a free EDA CAD application.
|
|
*
|
|
* Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
|
|
* Copyright (C) CERN
|
|
* @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
|
|
*
|
|
* 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 program; if not, you may find one here:
|
|
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
|
|
* or you may search the http://www.gnu.org website for the version 2 license,
|
|
* or you may write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
|
|
*/
|
|
|
|
#ifndef __MATH_UTIL_H
|
|
#define __MATH_UTIL_H
|
|
|
|
#include <cstdint>
|
|
|
|
/**
|
|
* Function rescale()
|
|
*
|
|
* Scales a number (value) by rational (numerator/denominator). Numerator must be <= denominator.
|
|
*/
|
|
|
|
template <typename T>
|
|
T rescale( T aNumerator, T aValue, T aDenominator )
|
|
{
|
|
return aNumerator * aValue / aDenominator;
|
|
}
|
|
|
|
template <typename T>
|
|
int sign( T val )
|
|
{
|
|
return ( T( 0 ) < val) - ( val < T( 0 ) );
|
|
}
|
|
|
|
// explicit specializations for integer types, taking care of overflow.
|
|
template <>
|
|
int rescale( int aNumerator, int aValue, int aDenominator );
|
|
|
|
template <>
|
|
int64_t rescale( int64_t aNumerator, int64_t aValue, int64_t aDenominator );
|
|
|
|
static inline int round_nearest( double v )
|
|
{
|
|
return int( v < 0 ? v - 0.5 : v + 0.5 );
|
|
}
|
|
|
|
#endif // __MATH_UTIL_H
|