longitude_degrees_normalize()

double longitude_degrees_normalize

(

double

lon

)

Convert a longitude to the range of -180,180.

Parameters

lon	longitude in degrees

Definition at line 106 of file lwgeodetic.c.

Referenced by gbox_centroid(), and ptarray_force_geodetic().

{
        if ( lon > 360.0 )
                lon = remainder(lon, 360.0);

        if ( lon < -360.0 )
                lon = remainder(lon, -360.0);

        if ( lon > 180.0 )
                lon = -360.0 + lon;

        if ( lon < -180.0 )
                lon = 360 + lon;

        if ( lon == -180.0 )
                return 180.0;

        if ( lon == -360.0 )
                return 0.0;

        return lon;
}

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