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https://github.com/mapnik/mapnik.git
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32e7202223
- add lonlat2merc, merc2lonlat overloads for single point - add stride argument to overloads for coordinate arrays - make all functions exported - change static string constants to exported - change static numeric constants to constexpr - remove superfluous numeric constants
74 lines
2.6 KiB
C++
74 lines
2.6 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2017 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#ifndef MAPNIK_WELL_KNOWN_SRS_HPP
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#define MAPNIK_WELL_KNOWN_SRS_HPP
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// mapnik
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#include <mapnik/enumeration.hpp>
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#include <mapnik/geometry/point.hpp>
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#include <mapnik/util/math.hpp>
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#pragma GCC diagnostic push
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#include <mapnik/warning_ignore.hpp>
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#include <boost/optional.hpp>
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#pragma GCC diagnostic pop
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// stl
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#include <vector>
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namespace mapnik {
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enum well_known_srs_enum : std::uint8_t {
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WGS_84,
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G_MERC,
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well_known_srs_enum_MAX
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};
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DEFINE_ENUM( well_known_srs_e, well_known_srs_enum );
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constexpr double EARTH_RADIUS = 6378137.0;
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constexpr double EARTH_CIRCUMFERENCE = EARTH_RADIUS * util::tau;
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constexpr double MERC_MAX_EXTENT = EARTH_RADIUS * util::pi;
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constexpr double MERC_MAX_LATITUDE = 85.0511287798065923778;
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// MERC_MAX_LATITUDE = degrees(2 * atan(exp(pi)) - pi / 2)
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extern MAPNIK_DECL std::string const MAPNIK_LONGLAT_PROJ;
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extern MAPNIK_DECL std::string const MAPNIK_GMERC_PROJ;
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MAPNIK_DECL boost::optional<bool> is_known_geographic(std::string const& srs);
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MAPNIK_DECL boost::optional<well_known_srs_e> is_well_known_srs(std::string const& srs);
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MAPNIK_DECL bool lonlat2merc(double & x, double & y);
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MAPNIK_DECL bool lonlat2merc(double * x, double * y, std::size_t point_count,
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std::size_t stride = 1);
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MAPNIK_DECL bool lonlat2merc(std::vector<geometry::point<double>> & ls);
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MAPNIK_DECL bool merc2lonlat(double & x, double & y);
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MAPNIK_DECL bool merc2lonlat(double * x, double * y, std::size_t point_count,
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std::size_t stride = 1);
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MAPNIK_DECL bool merc2lonlat(std::vector<geometry::point<double>> & ls);
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}
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#endif // MAPNIK_WELL_KNOWN_SRS_HPP
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