crosses_dateline()

int crosses_dateline	(	const GEOGRAPHIC_POINT *	s,
		const GEOGRAPHIC_POINT *	e
	)

Definition at line 662 of file lwgeodetic.c.

References FP_EQUALS, GEOGRAPHIC_POINT::lon, LW_FALSE, LW_TRUE, and SIGNUM.

Referenced by ptarray_area_spheroid().

{
        double sign_s = SIGNUM(s->lon);
        double sign_e = SIGNUM(e->lon);
        double ss = fabs(s->lon);
        double ee = fabs(e->lon);
        if ( sign_s == sign_e )
        {
                return LW_FALSE;
        }
        else
        {
                double dl = ss + ee;
                if ( dl < M_PI )
                        return LW_FALSE;
                else if ( FP_EQUALS(dl, M_PI) )
                        return LW_FALSE;
                else
                        return LW_TRUE;
        }
}

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