lwpoly_has_orientation()

int lwpoly_has_orientation	(	const LWPOLY *	poly,
		int	orientation
	)

Definition at line 287 of file lwpoly.c.

{
        if (lwpoly_is_empty(poly))
                return LW_TRUE;
 
        /* Exterior ring matches orientation? */
        if(!ptarray_has_orientation(poly->rings[0], orientation))
                return LW_FALSE;
 
        /* Interior rings are opposite of orientation? */
        for (uint32_t i = 1; i < poly->nrings; i++)
                if (!ptarray_has_orientation(poly->rings[i], -1 * orientation))
                        return LW_FALSE;
 
        return LW_TRUE;
}

References LW_FALSE, LW_TRUE, lwpoly_is_empty(), LWPOLY::nrings, ptarray_has_orientation(), and LWPOLY::rings.

Referenced by lwgeom_has_orientation().

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