ceph/src/boost/boost/geometry/srs/projections/impl/aasincos.hpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2 // This file is manually converted from PROJ4
   3
   4 // Copyright (c) 2008-2012 Barend Gehrels, Amsterdam, the Netherlands.
   5
   6 // This file was modified by Oracle on 2018.
   7 // Modifications copyright (c) 2018, Oracle and/or its affiliates.
   8 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
   9
  10 // Use, modification and distribution is subject to the Boost Software License,
  11 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  12 // http://www.boost.org/LICENSE_1_0.txt)
  13
  14 // This file is converted from PROJ4, http://trac.osgeo.org/proj
  15 // PROJ4 is originally written by Gerald Evenden (then of the USGS)
  16 // PROJ4 is maintained by Frank Warmerdam
  17 // PROJ4 is converted to Geometry Library by Barend Gehrels (Geodan, Amsterdam)
  18
  19 // Original copyright notice:
  20
  21 // Permission is hereby granted, free of charge, to any person obtaining a
  22 // copy of this software and associated documentation files (the "Software"),
  23 // to deal in the Software without restriction, including without limitation
  24 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
  25 // and/or sell copies of the Software, and to permit persons to whom the
  26 // Software is furnished to do so, subject to the following conditions:
  27
  28 // The above copyright notice and this permission notice shall be included
  29 // in all copies or substantial portions of the Software.
  30
  31 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  32 // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  33 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  34 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  35 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  36 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  37 // DEALINGS IN THE SOFTWARE.
  38
  39 #ifndef BOOST_GEOMETRY_PROJECTIONS_IMPL_AASINCOS_HPP
  40 #define BOOST_GEOMETRY_PROJECTIONS_IMPL_AASINCOS_HPP
  41
  42
  43 #include <cmath>
  44
  45 #include <boost/geometry/srs/projections/exception.hpp>
  46 #include <boost/geometry/srs/projections/impl/pj_strerrno.hpp>
  47 #include <boost/geometry/util/math.hpp>
  48
  49
  50 namespace boost { namespace geometry { namespace projections
  51 {
  52
  53 namespace detail
  54 {
  55
  56 namespace aasincos
  57 {
  58     template <typename T>
  59     inline T ONE_TOL() { return 1.00000000000001; }
  60     //template <typename T>
  61     //inline T TOL() { return 0.000000001; }
  62     template <typename T>
  63     inline T ATOL() { return 1e-50; }
  64 }
  65
  66 template <typename T>
  67 inline T aasin(T const& v)
  68 {
  69     T av = 0;
  70
  71     if ((av = geometry::math::abs(v)) >= 1.0)
  72     {
  73         if (av > aasincos::ONE_TOL<T>())
  74         {
  75             BOOST_THROW_EXCEPTION( projection_exception(error_acos_asin_arg_too_large) );
  76         }
  77         return (v < 0.0 ? -geometry::math::half_pi<T>() : geometry::math::half_pi<T>());
  78     }
  79
  80     return asin(v);
  81 }
  82
  83 template <typename T>
  84 inline T aacos(T const& v)
  85 {
  86     T av = 0;
  87
  88     if ((av = geometry::math::abs(v)) >= 1.0)
  89     {
  90         if (av > aasincos::ONE_TOL<T>())
  91         {
  92             BOOST_THROW_EXCEPTION( projection_exception(error_acos_asin_arg_too_large) );
  93         }
  94         return (v < 0.0 ? geometry::math::pi<T>() : 0.0);
  95     }
  96
  97     return acos(v);
  98 }
  99
 100 template <typename T>
 101 inline T asqrt(T const& v)
 102 {
 103     return ((v <= 0) ? 0 : sqrt(v));
 104 }
 105
 106 template <typename T>
 107 inline T aatan2(T const& n, T const& d)
 108 {
 109     return ((geometry::math::abs(n) < aasincos::ATOL<T>()
 110         && geometry::math::abs(d) < aasincos::ATOL<T>()) ? 0.0 : atan2(n, d));
 111 }
 112
 113
 114 } // namespace detail
 115
 116
 117 }}} // namespace boost::geometry::projections
 118
 119
 120 #endif // BOOST_GEOMETRY_PROJECTIONS_IMPL_AASINCOS_HPP