Server : Apache/2.4.41 (Ubuntu) System : Linux absol.cf 5.4.0-198-generic #218-Ubuntu SMP Fri Sep 27 20:18:53 UTC 2024 x86_64 User : www-data ( 33) PHP Version : 7.4.33 Disable Function : pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_get_handler,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,pcntl_async_signals,pcntl_unshare, Directory :  /usr/include/boost/geometry/formulas/

Upload File : current_dir [ Writeable ] document_root [ Writeable ]

// Boost.Geometry

// Copyright (c) 2016, 2018 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)

#ifndef BOOST_GEOMETRY_FORMULAS_ECCENCRICITY_SQR_HPP
#define BOOST_GEOMETRY_FORMULAS_ECCENCRICITY_SQR_HPP

#include <boost/geometry/algorithms/not_implemented.hpp>

#include <boost/geometry/core/radius.hpp>
#include <boost/geometry/core/tag.hpp>
#include <boost/geometry/core/tags.hpp>

#include <boost/geometry/util/math.hpp>

namespace boost { namespace geometry
{

#ifndef DOXYGEN_NO_DISPATCH
namespace formula_dispatch
{

template <typename ResultType, typename Geometry, typename Tag = typename tag<Geometry>::type>
struct eccentricity_sqr
    : not_implemented<Tag>
{};

template <typename ResultType, typename Geometry>
struct eccentricity_sqr<ResultType, Geometry, srs_sphere_tag>
{
    static inline ResultType apply(Geometry const& /*geometry*/)
    {
        return ResultType(0);
    }
};

template <typename ResultType, typename Geometry>
struct eccentricity_sqr<ResultType, Geometry, srs_spheroid_tag>
{
    static inline ResultType apply(Geometry const& geometry)
    {
        // 1 - (b / a)^2
        return ResultType(1) - math::sqr(ResultType(get_radius<2>(geometry))
                                       / ResultType(get_radius<0>(geometry)));
    }
};

} // namespace formula_dispatch
#endif // DOXYGEN_NO_DISPATCH

#ifndef DOXYGEN_NO_DETAIL
namespace formula
{

template <typename ResultType, typename Geometry>
ResultType eccentricity_sqr(Geometry const& geometry)
{
    return formula_dispatch::eccentricity_sqr<ResultType, Geometry>::apply(geometry);
}

} // namespace formula
#endif // DOXYGEN_NO_DETAIL

}} // namespace boost::geometry

#endif // BOOST_GEOMETRY_FORMULAS_ECCENCRICITY_SQR_HPP