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module;
#include <boost/geometry/geometries/geometries.hpp>
#include <cassert>
export module routemon:geo.utm;
import std;
import :geo;
import :geo.wgs84;
namespace routemon::geo::utm {
class zonable_wgs84_point
{
wgs84::normalized_point p_;
explicit inline zonable_wgs84_point(wgs84::normalized_point p) : p_{p} {}
public:
inline zonable_wgs84_point() : p_{} {}
inline static auto from(wgs84::normalized_point p)
-> std::optional<zonable_wgs84_point>
{
if (p.lat() < -80 || p.lat() > 84)
return std::nullopt;
return zonable_wgs84_point{p};
}
inline auto lat() const -> double { return p_.lat(); }
inline auto lon() const -> double { return p_.lon(); }
inline auto lon(double lon) -> void { p_.lon(lon); }
inline auto lat(double lat) -> void
{
if (lat < -80 || lat > 84)
throw std::range_error{"latitude out of range for UTM"};
p_.lat(lat);
}
};
} // namespace routemon::geo::utm
namespace boost::geometry::traits {
namespace {
using zonable_wgs84_point = routemon::geo::utm::zonable_wgs84_point;
} // namespace
template <>
struct tag<zonable_wgs84_point>
{
using type = point_tag;
};
template <>
struct dimension<zonable_wgs84_point> : boost::mpl::int_<2>
{
};
template <>
struct coordinate_type<zonable_wgs84_point>
{
using type = double;
};
template <>
struct coordinate_system<zonable_wgs84_point>
{
using type = routemon::geo::wgs84::cs;
};
template <std::size_t index>
struct access<zonable_wgs84_point, index>
{
static inline auto get(zonable_wgs84_point const& p) -> double
{
if constexpr (index == 0)
return p.lon();
else if constexpr (index == 1)
return p.lat();
else
static_assert(false, "Out of range");
}
static inline auto set(zonable_wgs84_point& p, double v) -> void
{
if constexpr (index == 0)
p.lon(v);
else if constexpr (index == 1)
p.lat(v);
else
static_assert(false, "Out of range");
}
};
} // namespace boost::geometry::traits
namespace routemon::geo::utm {
using zonable_wgs84_linestring =
bgeo::model::linestring<zonable_wgs84_point, std::vector>;
// In the sense of the common WGS84 subdivisions by simple northing
// and easting (so no Norway/Svalbard exceptions).
class zone
{
// Note: calculations heavily depend on the values of the variants.
enum class hemisphere : std::uint8_t
{
northern = 0,
southern = 1,
};
// Negative if in the southern hemisphere
// Equal to (zone_no - 1) * 2 + hemisphere
// In range [0, 119]
std::uint8_t zone_;
static constexpr auto zone_no_valid(std::uint8_t zone_no) -> bool
{
return 0 < zone_no && zone_no <= 60;
}
static constexpr auto from(std::uint8_t zone_no, hemisphere h) -> std::uint8_t
{
if (!zone_no_valid(zone_no))
throw std::invalid_argument{"invalid UTM zone number"};
return (zone_no - 1) * 2 + static_cast<std::uint8_t>(h);
}
public:
explicit constexpr zone(std::uint8_t zone_no, hemisphere h)
: zone_{from(zone_no, h)}
{
}
constexpr auto hemisphere() const -> enum hemisphere
{
return static_cast<enum hemisphere>(zone_ % 2);
}
// Return value in range [1, 60]
constexpr auto zone_no() const -> std::uint8_t { return 1 + zone_ / 2; }
// Return value in range [min(), max()]
constexpr auto as_index() const -> std::uint8_t { return zone_; }
static auto for_wgs84_point(zonable_wgs84_point p) noexcept -> zone
{
auto zone_no = static_cast<std::uint8_t>(1 + (p.lon() + 180.0) / 6.0);
auto northern = p.lat() >= 0.0;
return zone{
zone_no, northern ? hemisphere::northern : hemisphere::southern
};
}
constexpr auto wgs84_proj_epsg() const -> int
{
switch (hemisphere())
{
case hemisphere::northern:
return 32600 + zone_no();
case hemisphere::southern:
return 32700 + zone_no();
}
}
// Guarantee: min().as_index() == 0.
static constexpr auto min() noexcept -> zone
{
return zone{1, hemisphere::northern};
}
static constexpr auto max() noexcept -> zone
{
return zone{60, hemisphere::southern};
}
constexpr auto next() const -> zone
{
assert(zone_ <= max().as_index());
if (zone_ == max().as_index())
throw std::range_error{"cannot take next of greatest UTM zone"};
auto copy = zone{*this};
copy.zone_++;
return copy;
}
constexpr auto operator==(zone rhs) const -> bool
{
return zone_ == rhs.zone_;
}
};
static_assert(zone::min().as_index() == 0);
static_assert(zone::max().as_index() == 119);
} // namespace routemon::geo::utm
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