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Diffstat (limited to 'common/rational.h')
| -rw-r--r-- | common/rational.h | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/common/rational.h b/common/rational.h new file mode 100644 index 0000000000..1ad33de8a6 --- /dev/null +++ b/common/rational.h @@ -0,0 +1,111 @@ +/* ScummVM - Graphic Adventure Engine + * + * ScummVM is the legal property of its developers, whose names + * are too numerous to list here. Please refer to the COPYRIGHT + * file distributed with this source distribution. + * + * 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, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * $URL$ + * $Id$ + */ + +#ifndef COMMON_RATIONAL_H +#define COMMON_RATIONAL_H + +#include "common/scummsys.h" +#include "common/frac.h" + +namespace Common { + +/** A simple rational class that holds fractions. */ +class Rational { +public: + Rational(); + Rational(int num); + Rational(int num, int denom); + + Rational &operator=(const Rational &right); + Rational &operator=(int right); + + Rational &operator+=(const Rational &right); + Rational &operator-=(const Rational &right); + Rational &operator*=(const Rational &right); + Rational &operator/=(const Rational &right); + + Rational &operator+=(int right); + Rational &operator-=(int right); + Rational &operator*=(int right); + Rational &operator/=(int right); + + const Rational operator-() const; + + const Rational operator+(const Rational &right) const; + const Rational operator-(const Rational &right) const; + const Rational operator*(const Rational &right) const; + const Rational operator/(const Rational &right) const; + + const Rational operator+(int right) const; + const Rational operator-(int right) const; + const Rational operator*(int right) const; + const Rational operator/(int right) const; + + bool operator==(const Rational &right) const; + bool operator!=(const Rational &right) const; + bool operator>(const Rational &right) const; + bool operator<(const Rational &right) const; + bool operator>=(const Rational &right) const; + bool operator<=(const Rational &right) const; + + bool operator==(int right) const; + bool operator!=(int right) const; + bool operator>(int right) const; + bool operator<(int right) const; + bool operator>=(int right) const; + bool operator<=(int right) const; + + operator int() const; + operator double() const; + + void invert(); + Rational getInverse() const; + + int toInt() const; + double toDouble() const; + frac_t toFrac() const; + +private: + int _num; + int _denom; + + void cancel(); + void normalize(); +}; + +const Rational operator+(int left, const Rational &right); +const Rational operator-(int left, const Rational &right); +const Rational operator*(int left, const Rational &right); +const Rational operator/(int left, const Rational &right); + +bool operator==(int left, const Rational &right); +bool operator!=(int left, const Rational &right); +bool operator>(int left, const Rational &right); +bool operator<(int left, const Rational &right); +bool operator>=(int left, const Rational &right); +bool operator<=(int left, const Rational &right); + +} // End of namespace Common + +#endif |