projection.hpp

Go to the documentation of this file.

#ifndef OSMIUM_GEOM_PROJECTION_HPP
#define OSMIUM_GEOM_PROJECTION_HPP
 
/*
 
This file is part of Osmium (https://osmcode.org/libosmium).
 
Copyright 2013-2023 Jochen Topf <jochen@topf.org> and others (see README).
 
Boost Software License - Version 1.0 - August 17th, 2003
 
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
 
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
 
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, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
 
*/
 
#include <osmium/geom/coordinates.hpp>
#include <osmium/geom/mercator_projection.hpp>
#include <osmium/geom/util.hpp>
#include <osmium/osm/location.hpp>
#include <osmium/util/compatibility.hpp>
 
#ifdef ACCEPT_USE_OF_DEPRECATED_PROJ_API_H
# include <proj_api.h>
#else
# define ACCEPT_USE_OF_DEPRECATED_PROJ_API_H
# include <proj_api.h>
# undef ACCEPT_USE_OF_DEPRECATED_PROJ_API_H
#endif
 
#include <memory>
#include <string>
 
namespace osmium {
 
    namespace geom {
 
        class OSMIUM_DEPRECATED CRS {
 
            struct ProjCRSDeleter {
                void operator()(void* crs) {
                    pj_free(crs);
                }
            }; // struct ProjCRSDeleter
 
            std::unique_ptr<void, ProjCRSDeleter> m_crs;
 
        public:
 
            explicit CRS(const char* crs) :
                m_crs(pj_init_plus(crs), ProjCRSDeleter()) {
                if (!m_crs) {
                    throw osmium::projection_error{std::string{"creation of CRS failed: "} + pj_strerrno(*pj_get_errno_ref())};
                }
            }
 
            explicit CRS(const std::string& crs) :
                CRS(crs.c_str()) {
            }
 
            explicit CRS(int epsg) :
                CRS(std::string{"+init=epsg:"} + std::to_string(epsg)) {
            }
 
            projPJ get() const noexcept {
                return m_crs.get();
            }
 
            bool is_latlong() const noexcept {
                return pj_is_latlong(m_crs.get()) != 0;
            }
 
            bool is_geocent() const noexcept {
                return pj_is_geocent(m_crs.get()) != 0;
            }
 
        }; // class CRS
 
        inline OSMIUM_DEPRECATED Coordinates transform(const CRS& src, const CRS& dest, Coordinates c) {
            const int result = pj_transform(src.get(), dest.get(), 1, 1, &c.x, &c.y, nullptr);
            if (result != 0) {
                throw osmium::projection_error{std::string{"projection failed: "} + pj_strerrno(result)};
            }
            return c;
        }
 
        class OSMIUM_DEPRECATED Projection {
 
            int m_epsg;
            std::string m_proj_string;
            CRS m_crs_wgs84{4326};
            CRS m_crs_user;
 
        public:
 
            explicit Projection(std::string proj_string) :
                m_epsg(-1),
                m_proj_string(std::move(proj_string)),
                m_crs_user(proj_string) {
            }
 
            explicit Projection(const char* proj_string) :
                m_epsg(-1),
                m_proj_string(proj_string),
                m_crs_user(proj_string) {
            }
 
            explicit Projection(int epsg) :
                m_epsg(epsg),
                m_proj_string(std::string{"+init=epsg:"} + std::to_string(epsg)),
                m_crs_user(epsg) {
            }
 
            Coordinates operator()(osmium::Location location) const {
                if (m_epsg == 4326) {
                    return Coordinates{location.lon(), location.lat()};
                }
 
                if (m_epsg == 3857) {
                    return Coordinates{detail::lon_to_x(location.lon()),
                                       detail::lat_to_y(location.lat())};
                }
 
                Coordinates c{transform(m_crs_wgs84, m_crs_user, Coordinates{deg_to_rad(location.lon()),
                                                                             deg_to_rad(location.lat())})};
                if (m_crs_user.is_latlong()) {
                    c.x = rad_to_deg(c.x);
                    c.y = rad_to_deg(c.y);
                }
 
                return c;
            }
 
            int epsg() const noexcept {
                return m_epsg;
            }
 
            std::string proj_string() const {
                return m_proj_string;
            }
 
        }; // class Projection
 
    } // namespace geom
 
} // namespace osmium
 
#endif // OSMIUM_GEOM_PROJECTION_HPP