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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 | ||
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6 | // This file was modified by Oracle on 2017, 2018. |
7 | // Modifications copyright (c) 2017-2018, Oracle and/or its affiliates. | |
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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_PJ_TSFN_HPP | |
40 | #define BOOST_GEOMETRY_PROJECTIONS_PJ_TSFN_HPP | |
41 | ||
42 | #include <boost/geometry/util/math.hpp> | |
43 | ||
44 | namespace boost { namespace geometry { namespace projections { | |
45 | namespace detail { | |
46 | ||
47 | /* determine small t */ | |
48 | template <typename T> | |
49 | inline T pj_tsfn(T const& phi, T sinphi, T const& e) | |
50 | { | |
51 | sinphi *= e; | |
52 | return (tan (.5 * (geometry::math::half_pi<T>() - phi)) / | |
92f5a8d4 | 53 | math::pow((T(1) - sinphi) / (T(1) + sinphi), T(0.5) * e)); |
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54 | } |
55 | ||
56 | } // namespace detail | |
57 | }}} // namespace boost::geometry::projections | |
58 | #endif |