math_util.h 1.67 KB
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/*
 * This program source code file is part of KICAD, a free EDA CAD application.
 *
 * Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
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 * Copyright (C) CERN
 * @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
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 *
 * 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 <stdint.h>

/**
 * Function rescale()
 *
 * Scales a number (value) by rational (numerator/denominator). Numerator must be <= denominator.
 */

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template <typename T>
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T rescale( T aNumerator, T aValue, T aDenominator )
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{
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    return aNumerator * aValue / aDenominator;
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}

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// explicit specializations for integer types, taking care of overflow.
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template <>
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int rescale( int aNumerator, int aValue, int aDenominator );
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template <>
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int64_t rescale( int64_t aNumerator, int64_t aValue, int64_t aDenominator );
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#endif // __MATH_UTIL_H