euroscope-sys 0.0.1

Raw FFI bindings and C++ glue shim for the EuroScope plugin SDK
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// Rust -> EuroScope wrappers for CPosition.
//
// CPosition is a value type (two public doubles + geodesic helpers), not a
// handle. Rust holds the lat/lon itself; these wrappers only expose EuroScope's
// distance/bearing formulas, which are computed inside EuroScope.

#include "common.h"

static CPosition make(double lat, double lon)
{
    CPosition p;
    p.m_Latitude = lat;
    p.m_Longitude = lon;
    return p;
}

extern "C" double es_position_distance(double lat1, double lon1, double lat2, double lon2)
{
    return make(lat1, lon1).DistanceTo(make(lat2, lon2));
}

extern "C" double es_position_direction(double lat1, double lon1, double lat2, double lon2)
{
    return make(lat1, lon1).DirectionTo(make(lat2, lon2));
}

// Parse EuroScope coordinate strings ("N047.25.24.615" / "E019.17.35.260").
// Returns whether parsing succeeded; on success fills *lat / *lon.
extern "C" bool es_position_from_strings(const char* longitude, const char* latitude, double* lat,
                                         double* lon)
{
    CPosition p;
    // NOTE: LoadFromStrings takes (longitude, latitude) in that order.
    if (!p.LoadFromStrings(longitude, latitude))
    {
        return false;
    }
    *lat = p.m_Latitude;
    *lon = p.m_Longitude;
    return true;
}