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#ifndef SQL_GIS_LONGITUDE_RANGE_NORMALIZER_H_INCLUDED
#define SQL_GIS_LONGITUDE_RANGE_NORMALIZER_H_INCLUDED
// Copyright (c) 2021, 2025, Oracle and/or its affiliates.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License, version 2.0,
// as published by the Free Software Foundation.
//
// This program is designed to work with certain software (including
// but not limited to OpenSSL) that is licensed under separate terms,
// as designated in a particular file or component or in included license
// documentation. The authors of MySQL hereby grant you an additional
// permission to link the program and your derivative works with the
// separately licensed software that they have either included with
// the program or referenced in the documentation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License, version 2.0, for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
/// @file
///
/// Implements a longitude normalizer that converts longitude coordinates
/// outside the range such that geometries wrap correctly across
/// the 180/-180 boundary on the globe.
#include <cmath> // M_PI
#include "sql/dd/types/spatial_reference_system.h" // dd::Spatial_reference_system
#include "sql/gis/geometry_visitor.h"
namespace gis {
class Longitude_range_normalizer : public Nop_visitor {
private:
const dd::Spatial_reference_system *m_srs;
public:
/// Construct a new longitude range normalizer.
///
/// @param srs The spatial reference system of the geometry.
explicit Longitude_range_normalizer(const dd::Spatial_reference_system *srs)
: m_srs(srs) {}
using Nop_visitor::visit;
bool visit(Point *pt) override {
double lon = pt->x() - m_srs->prime_meridian() * m_srs->angular_unit();
if (!m_srs->positive_east()) lon *= -1.0;
if (lon <= -M_PI) {
// Longitude -180 or less, so we add 360 (2*pi): e.g. -182 + 360 = 178
pt->x(lon + 2.0 * M_PI);
} else if (lon > M_PI) {
// Longitude over 180, so we subtract 360 (2*pi): e.g. 181 - 360 = -179
pt->x(lon - 2.0 * M_PI);
}
return false;
}
};
} // namespace gis
#endif // SQL_GIS_LONGITUDE_RANGE_NORMALIZER_H_INCLUDED
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