AngleOperations.hpp

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// Copyright (c) 2012-2019 University of Lyon and CNRS (France).
// All rights reserved.
//
// This file is part of MEPP2; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 3 of
// the License, or (at your option) any later version.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#pragma once
 
#include "FEVV/Tools/Math/degree_rad_conversion.h" // rad2deg()
#include <cmath> // M_PI, asin
 
 
namespace FEVV {
namespace Operators {
 
namespace Geometry {
 
template< class T >
static T
asin(T sine)
{
  if(sine >= 1.f)
    return M_PI * 0.5f;
  else if(sine <= -1.f)
    return -M_PI * 0.5f;
  else
    return std::asin(sine);
}
 
template< class T >
static T
asin_degree(T sine)
{
  return Math::rad2deg(Geometry::asin< T >(sine));
}
 
template< class T >
inline T
acos(T cosine)
{
  if(cosine < -1.f)
    cosine = -1.f;
  else if(cosine > 1.f)
    cosine = 1.f;
 
  return std::acos(cosine);
}
 
template< class T >
inline T
acos_degree(T cosine)
{
  return Math::rad2deg(Geometry::acos< T >(cosine));
}
} // namespace Geometry
 
} // namespace Operators
} // namespace FEVV