longitude_radians_normalize()

double longitude_radians_normalize

(

double

lon

)

Convert a longitude to the range of -PI,PI.

Definition at line 50 of file lwgeodetic.c.

Referenced by geographic_point_init(), lwgeom_project_spheroid(), and point_deg2rad().

{
        if ( lon == -1.0 * M_PI )
                return M_PI;
        if ( lon == -2.0 * M_PI )
                return 0.0;

        if ( lon > 2.0 * M_PI )
                lon = remainder(lon, 2.0 * M_PI);

        if ( lon < -2.0 * M_PI )
                lon = remainder(lon, -2.0 * M_PI);

        if ( lon > M_PI )
                lon = -2.0 * M_PI + lon;

        if ( lon < -1.0 * M_PI )
                lon = 2.0 * M_PI + lon;

        if ( lon == -2.0 * M_PI )
                lon *= -1.0;

        return lon;
}

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