fbe169fa17
See tdf#42949 for motivation Change-Id: Iaebddd648c52c175da17d2a55a1e8de82c213f4d Reviewed-on: https://gerrit.libreoffice.org/c/core/+/127330 Tested-by: Jenkins Reviewed-by: Thorsten Behrens <thorsten.behrens@allotropia.de>
60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#pragma once
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#include <sal/config.h>
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#include <basegfx/numeric/ftools.hxx>
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#include <sal/types.h>
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#include <o3tl/strong_int.hxx>
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#include <o3tl/unit_conversion.hxx>
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#include <cstdlib>
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#include <math.h>
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#include <numeric>
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template <int N> struct FractionTag;
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// 1/Nth fraction of a degree
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template <typename I, int N> using Degree = o3tl::strong_int<I, FractionTag<N>>;
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template <typename I, int N> char (&NofDegree(Degree<I, N>))[N]; // helper
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// Nof<DegreeN> gives compile-time constant N, needed in templates
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template <class D> constexpr int Nof = sizeof(NofDegree(std::declval<D>()));
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/** tenths of a Degree, normally rotation */
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typedef Degree<sal_Int16, 10> Degree10;
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/** custom literal */
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constexpr Degree10 operator""_deg10(unsigned long long n) { return Degree10{ n }; }
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/** hundredths of a Degree, normally rotation */
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typedef Degree<sal_Int32, 100> Degree100;
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// Android has trouble calling the correct overload of std::abs
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#ifdef ANDROID
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inline Degree100 abs(Degree100 x) { return Degree100(std::abs(static_cast<int>(x.get()))); }
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#else
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inline Degree100 abs(Degree100 x) { return Degree100(std::abs(x.get())); }
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#endif
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/** custom literal */
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constexpr Degree100 operator""_deg100(unsigned long long n) { return Degree100{ n }; }
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/** conversion functions */
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template <class To, typename IofFrom, int NofFrom> inline To to(Degree<IofFrom, NofFrom> x)
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{
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constexpr sal_Int64 m = Nof<To> / std::gcd(Nof<To>, NofFrom);
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constexpr sal_Int64 d = NofFrom / std::gcd(Nof<To>, NofFrom);
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return To{ o3tl::convert(x.get(), m, d) };
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}
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template <class D> inline double toRadians(D x) { return basegfx::deg2rad<Nof<D>>(x.get()); }
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template <class D> inline double toDegrees(D x) { return x.get() / static_cast<double>(Nof<D>); }
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/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
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