degree.hxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
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 * This Source Code Form is subject to the terms of the Mozilla Public
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 */
#pragma once
 
#include <sal/config.h>
 
#include <basegfx/numeric/ftools.hxx>
#include <sal/types.h>
#include <o3tl/strong_int.hxx>
#include <o3tl/unit_conversion.hxx>
#include <cstdlib>
#include <math.h>
#include <numeric>
 
template <int N> struct FractionTag;
// 1/Nth fraction of a degree
template <typename I, int N> using Degree = o3tl::strong_int<I, FractionTag<N>>;
 
template <typename I, int N> char (&NofDegree(Degree<I, N>))[N]; // helper
// Nof<DegreeN> gives compile-time constant N, needed in templates
template <class D> constexpr int Nof = sizeof(NofDegree(std::declval<D>()));
 
typedef Degree<sal_Int16, 10> Degree10;
 
constexpr Degree10 operator""_deg10(unsigned long long n) { return Degree10{ n }; }
 
typedef Degree<sal_Int32, 100> Degree100;
 
// Android has trouble calling the correct overload of std::abs
#ifdef ANDROID
inline Degree100 abs(Degree100 x) { return Degree100(std::abs(static_cast<int>(x.get()))); }
#else
inline Degree100 abs(Degree100 x) { return Degree100(std::abs(x.get())); }
#endif
 
constexpr Degree100 operator""_deg100(unsigned long long n) { return Degree100{ n }; }
 
template <class To, typename IofFrom, int NofFrom> inline To to(Degree<IofFrom, NofFrom> x)
{
    constexpr sal_Int64 m = Nof<To> / std::gcd(Nof<To>, NofFrom);
    constexpr sal_Int64 d = NofFrom / std::gcd(Nof<To>, NofFrom);
    return To{ o3tl::convert(x.get(), m, d) };
}
 
template <class D> inline double toRadians(D x) { return basegfx::deg2rad<Nof<D>>(x.get()); }
template <class D> inline double toDegrees(D x) { return x.get() / static_cast<double>(Nof<D>); }
 
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