1 files changed, 60 insertions, 0 deletions
diff --git a/include/tools/degree.hxx b/include/tools/degree.hxx
new file mode 100644
index 0000000000..560f9b115f
--- /dev/null
+++ b/include/tools/degree.hxx
@@ -0,0 +1,60 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+#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>()));
+
+/** tenths of a Degree, normally rotation */
+typedef Degree<sal_Int16, 10> Degree10;
+
+/** custom literal */
+constexpr Degree10 operator""_deg10(unsigned long long n) { return Degree10{ n }; }
+
+/** hundredths of a Degree, normally rotation */
+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
+
+/** custom literal */
+constexpr Degree100 operator""_deg100(unsigned long long n) { return Degree100{ n }; }
+
+/** conversion functions */
+
+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>); }
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */