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>
ONE_TOL()59 inline T ONE_TOL() { return 1.00000000000001; }
60 //template <typename T>
61 //inline T TOL() { return 0.000000001; }
62 template <typename T>
ATOL()63 inline T ATOL() { return 1e-50; }
64 }
65
66 template <typename T>
aasin(T const & v)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>
aacos(T const & v)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>
asqrt(T const & v)101 inline T asqrt(T const& v)
102 {
103 return ((v <= 0) ? 0 : sqrt(v));
104 }
105
106 template <typename T>
aatan2(T const & n,T const & d)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
121