| /************************************************************** |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| *************************************************************/ |
| |
| |
| |
| #include <resourcemodel/Fraction.hxx> |
| |
| namespace writerfilter { |
| namespace resourcemodel { |
| |
| sal_uInt32 gcd(sal_uInt32 a, sal_uInt32 b) |
| { |
| if (a == 0 || b == 0) |
| return a | b; |
| |
| sal_uInt32 nShift = 0; |
| while (((a | b) & 1) == 0) |
| { |
| a >>= 1; |
| b >>= 1; |
| ++nShift; |
| } |
| |
| while ((a & 1) == 0) |
| a >>= 1; |
| |
| do |
| { |
| while ((b & 1) == 0) |
| b >>= 1; |
| |
| if (a < b) |
| { |
| b -= a; |
| } |
| else |
| { |
| sal_uInt32 nDiff = a - b; |
| a = b; |
| b = nDiff; |
| } |
| |
| b >>= 1; |
| } |
| while (b != 0); |
| |
| return a << nShift; |
| } |
| |
| sal_uInt32 lcm(sal_Int32 a, sal_Int32 b) |
| { |
| return abs(a * b) / gcd(abs(a), abs(b)); |
| } |
| |
| Fraction::Fraction(sal_Int32 nNumerator, sal_Int32 nDenominator) |
| { |
| init(nNumerator, nDenominator); |
| } |
| |
| Fraction::Fraction(const Fraction & a, const Fraction & b) |
| { |
| init(a.mnNumerator * b.mnDenominator, a.mnDenominator * b.mnNumerator); |
| } |
| |
| Fraction::~Fraction() |
| { |
| } |
| |
| void Fraction::init(sal_Int32 nNumerator, sal_Int32 nDenominator) |
| { |
| sal_uInt32 nGCD = gcd(nNumerator, nDenominator); |
| |
| mnNumerator = nNumerator/ nGCD; |
| mnDenominator = nDenominator / nGCD; |
| } |
| |
| void Fraction::assign(const Fraction & rFraction) |
| { |
| init(rFraction.mnNumerator, rFraction.mnDenominator); |
| } |
| |
| Fraction Fraction::inverse() const |
| { |
| return Fraction(mnDenominator, mnNumerator); |
| } |
| |
| Fraction Fraction::operator + (const Fraction & rFraction) const |
| { |
| sal_uInt32 nLCM = lcm(mnDenominator, rFraction.mnDenominator); |
| |
| return Fraction(mnNumerator * nLCM / mnDenominator + rFraction.mnNumerator * nLCM / rFraction.mnDenominator, nLCM); |
| } |
| |
| Fraction Fraction::operator - (const Fraction & rFraction) const |
| { |
| sal_uInt32 nLCM = lcm(mnDenominator, rFraction.mnDenominator); |
| |
| return Fraction(mnNumerator * nLCM / mnDenominator - rFraction.mnNumerator * nLCM / rFraction.mnDenominator, nLCM); |
| } |
| |
| Fraction Fraction::operator * (const Fraction & rFraction) const |
| { |
| return Fraction(mnNumerator * rFraction.mnNumerator, mnDenominator * rFraction.mnDenominator); |
| } |
| |
| Fraction Fraction::operator / (const Fraction & rFraction) const |
| { |
| return *this * rFraction.inverse(); |
| } |
| |
| Fraction Fraction::operator = (const Fraction & rFraction) |
| { |
| assign(rFraction); |
| |
| return *this; |
| } |
| |
| Fraction::operator sal_Int32() const |
| { |
| return mnNumerator / mnDenominator; |
| } |
| |
| Fraction::operator float() const |
| { |
| return static_cast<float>(mnNumerator) / static_cast<float>(mnDenominator); |
| } |
| |
| }} |