From 95b421fce009aee6687bfc508e5fc6826f06d83d Mon Sep 17 00:00:00 2001
From: Sebastian Eibl <sebastian.eibl@fau.de>
Date: Fri, 18 Dec 2020 16:41:28 +0100
Subject: [PATCH] [ADD] radians <-> degree conversion functions

---
 src/core/math/Angles.h     | 34 +++++++++++++++++++++++++++++
 tests/core/Angles.test.cpp | 44 ++++++++++++++++++++++++++++++++++++++
 tests/core/CMakeLists.txt  |  3 +++
 3 files changed, 81 insertions(+)
 create mode 100644 src/core/math/Angles.h
 create mode 100644 tests/core/Angles.test.cpp

diff --git a/src/core/math/Angles.h b/src/core/math/Angles.h
new file mode 100644
index 000000000..3294d892b
--- /dev/null
+++ b/src/core/math/Angles.h
@@ -0,0 +1,34 @@
+//======================================================================================================================
+//
+//  This file is part of waLBerla. waLBerla 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 3 of
+//  the License, or (at your option) any later version.
+//
+//  waLBerla 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 waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file
+//! \author Sebastian Eibl <sebastian.eibl@fau.de>
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "Constants.h"
+
+namespace walberla
+{
+namespace math
+{
+///Converts a degrees angle to radians.
+constexpr real_t degToRad(real_t deg) {return deg * (pi / real_t(180));}
+///Converts a radians angle to degrees.
+constexpr real_t radToDeg(real_t rad) {return rad * (real_t(180) / pi);}
+} // namespace math
+} // namespace walberla
diff --git a/tests/core/Angles.test.cpp b/tests/core/Angles.test.cpp
new file mode 100644
index 000000000..6190dc41b
--- /dev/null
+++ b/tests/core/Angles.test.cpp
@@ -0,0 +1,44 @@
+//======================================================================================================================
+//
+//  This file is part of waLBerla. waLBerla 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 3 of 
+//  the License, or (at your option) any later version.
+//  
+//  waLBerla 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 waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file 
+//! \author Sebastian Eibl <sebastian.eibl@fau.de>
+//
+//======================================================================================================================
+
+#include "core/DataTypes.h"
+#include "core/math/Angles.h"
+#include "core/debug/TestSubsystem.h"
+
+namespace walberla{
+
+int main( int /*argc*/, char** /*argv*/ )
+{
+   using namespace walberla::math;
+
+   debug::enterTestMode();
+
+   WALBERLA_CHECK_FLOAT_EQUAL( radToDeg(half_pi), 90_r );
+   WALBERLA_CHECK_FLOAT_EQUAL( half_pi, degToRad(90_r) );
+
+   return EXIT_SUCCESS;
+}
+
+} //namespace walberla
+
+int main( int argc, char** argv )
+{
+   return walberla::main(argc, argv);
+}
diff --git a/tests/core/CMakeLists.txt b/tests/core/CMakeLists.txt
index df07f5c8f..992b516f4 100644
--- a/tests/core/CMakeLists.txt
+++ b/tests/core/CMakeLists.txt
@@ -186,6 +186,9 @@ else()
 endif()
 waLBerla_execute_test( NAME AllHeaderTest )
 
+waLBerla_compile_test( FILES Angles.test.cpp )
+waLBerla_execute_test( NAME Angles )
+
 waLBerla_compile_test( FILES ConcatIterator.cpp )
 waLBerla_execute_test( NAME ConcatIterator )
 
-- 
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