Imported Upstream version 1.67.0upstream/1.67.0

1 files changed, 73 insertions, 0 deletions

diff --git a/boost/geometry/srs/projections/impl/pj_phi2.hpp b/boost/geometry/srs/projections/impl/pj_phi2.hpp
new file mode 100644
index 0000000000..71f0cf1249
--- /dev/null
+++ b/boost/geometry/srs/projections/impl/pj_phi2.hpp
@@ -0,0 +1,73 @@
+// Boost.Geometry (aka GGL, Generic Geometry Library)
+// This file is manually converted from PROJ4
+
+// Copyright (c) 2008-2012 Barend Gehrels, Amsterdam, the Netherlands.
+
+// This file was modified by Oracle on 2017.
+// Modifications copyright (c) 2017, Oracle and/or its affiliates.
+// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
+
+// Use, modification and distribution is subject to the Boost Software License,
+// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// This file is converted from PROJ4, http://trac.osgeo.org/proj
+// PROJ4 is originally written by Gerald Evenden (then of the USGS)
+// PROJ4 is maintained by Frank Warmerdam
+// PROJ4 is converted to Geometry Library by Barend Gehrels (Geodan, Amsterdam)
+
+// Original copyright notice:
+
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+#ifndef BOOST_GEOMETRY_PROJECTIONS_PHI2_HPP
+#define BOOST_GEOMETRY_PROJECTIONS_PHI2_HPP
+
+#include <boost/geometry/util/math.hpp>
+
+namespace boost { namespace geometry { namespace projections {
+namespace detail {
+
+template <typename T>
+inline T pj_phi2(T const& ts, T const& e)
+{
+    static const T TOL = 1.0e-10;
+    static const int N_ITER = 15;
+
+    T eccnth, Phi, con, dphi;
+    int i;
+
+    eccnth = .5 * e;
+    Phi = geometry::math::half_pi<T>() - 2. * atan (ts);
+    i = N_ITER;
+    do {
+        con = e * sin (Phi);
+        dphi = geometry::math::half_pi<T>() - 2. * atan (ts * pow((1. - con) /
+           (1. + con), eccnth)) - Phi;
+        Phi += dphi;
+    } while ( geometry::math::abs(dphi) > TOL && --i);
+    if (i <= 0)
+        BOOST_THROW_EXCEPTION( projection_exception(-18) );
+    return Phi;
+}
+
+} // namespace detail
+}}} // namespace boost::geometry::projections
+
+#endif