124 lines
4.2 KiB
C++
124 lines
4.2 KiB
C++
// Boost.Geometry
|
|
|
|
// Copyright (c) 2022 Barend Gehrels, Amsterdam, the Netherlands.
|
|
// Copyright (c) 2023 Adam Wulkiewicz, Lodz, Poland.
|
|
|
|
// 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_STRATEGIES_GEOGRAPHIC_BUFFER_JOIN_ROUND_HPP
|
|
#define BOOST_GEOMETRY_STRATEGIES_GEOGRAPHIC_BUFFER_JOIN_ROUND_HPP
|
|
|
|
#include <boost/range/value_type.hpp>
|
|
|
|
#include <boost/geometry/core/radian_access.hpp>
|
|
|
|
#include <boost/geometry/srs/spheroid.hpp>
|
|
#include <boost/geometry/strategies/buffer.hpp>
|
|
#include <boost/geometry/strategies/geographic/buffer_helper.hpp>
|
|
#include <boost/geometry/strategies/geographic/parameters.hpp>
|
|
#include <boost/geometry/util/math.hpp>
|
|
#include <boost/geometry/util/select_calculation_type.hpp>
|
|
|
|
|
|
namespace boost { namespace geometry
|
|
{
|
|
|
|
namespace strategy { namespace buffer
|
|
{
|
|
|
|
template
|
|
<
|
|
typename FormulaPolicy = strategy::andoyer,
|
|
typename Spheroid = srs::spheroid<double>,
|
|
typename CalculationType = void
|
|
>
|
|
class geographic_join_round
|
|
{
|
|
public :
|
|
|
|
//! \brief Constructs the strategy with a spheroid
|
|
//! \param spheroid The spheroid to be used
|
|
//! \param points_per_circle Number of points (minimum 4) that would be used for a full circle
|
|
explicit inline geographic_join_round(Spheroid const& spheroid,
|
|
std::size_t points_per_circle = default_points_per_circle)
|
|
: m_spheroid(spheroid)
|
|
, m_points_per_circle(get_point_count_for_join(points_per_circle))
|
|
{}
|
|
|
|
//! \brief Constructs the strategy
|
|
//! \param points_per_circle Number of points (minimum 4) that would be used for a full circle
|
|
explicit inline geographic_join_round(std::size_t points_per_circle = default_points_per_circle)
|
|
: m_points_per_circle(get_point_count_for_join(points_per_circle))
|
|
{}
|
|
|
|
#ifndef DOXYGEN_SHOULD_SKIP_THIS
|
|
//! Fills output_range with a rounded shape around a vertex
|
|
template <typename Point, typename DistanceType, typename RangeOut>
|
|
inline bool apply(Point const& /*ip*/, Point const& vertex,
|
|
Point const& perp1, Point const& perp2,
|
|
DistanceType const& buffer_distance,
|
|
RangeOut& range_out) const
|
|
{
|
|
using calc_t = typename select_calculation_type
|
|
<
|
|
Point,
|
|
typename boost::range_value<RangeOut>::type,
|
|
CalculationType
|
|
>::type;
|
|
|
|
using helper = geographic_buffer_helper<FormulaPolicy, calc_t>;
|
|
|
|
calc_t const lon_rad = get_as_radian<0>(vertex);
|
|
calc_t const lat_rad = get_as_radian<1>(vertex);
|
|
|
|
calc_t first_azimuth;
|
|
calc_t angle_diff;
|
|
if (! helper::calculate_angles(lon_rad, lat_rad, perp1, perp2, m_spheroid,
|
|
angle_diff, first_azimuth))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static calc_t const two_pi = geometry::math::two_pi<calc_t>();
|
|
calc_t const circle_fraction = angle_diff / two_pi;
|
|
std::size_t const n = (std::max)(static_cast<std::size_t>(
|
|
std::ceil(m_points_per_circle * circle_fraction)), std::size_t(1));
|
|
|
|
calc_t const diff = angle_diff / static_cast<calc_t>(n);
|
|
calc_t azi = math::wrap_azimuth_in_radian(first_azimuth + diff);
|
|
|
|
range_out.push_back(perp1);
|
|
|
|
// Generate points between 0 and n, not including them
|
|
// because perp1 and perp2 are inserted before and after this range.
|
|
for (std::size_t i = 1; i < n; i++)
|
|
{
|
|
helper::append_point(lon_rad, lat_rad, buffer_distance, azi, m_spheroid, range_out);
|
|
azi = math::wrap_azimuth_in_radian(azi + diff);
|
|
}
|
|
|
|
range_out.push_back(perp2);
|
|
return true;
|
|
}
|
|
|
|
template <typename NumericType>
|
|
static inline NumericType max_distance(NumericType const& distance)
|
|
{
|
|
return distance;
|
|
}
|
|
|
|
#endif // DOXYGEN_SHOULD_SKIP_THIS
|
|
|
|
private :
|
|
Spheroid m_spheroid;
|
|
std::size_t m_points_per_circle;
|
|
};
|
|
|
|
}} // namespace strategy::buffer
|
|
|
|
}} // namespace boost::geometry
|
|
|
|
#endif // BOOST_GEOMETRY_STRATEGIES_GEOGRAPHIC_BUFFER_JOIN_ROUND_HPP
|