lwpoly_force_orientation()

void lwpoly_force_orientation	(	LWPOLY *	poly,
		int	orientation
	)

Definition at line 268 of file lwpoly.c.

{
        /* No-op no orientation */
        if (orientation == LW_NONE) return;
 
        /* No-op empties */
        if (lwpoly_is_empty(poly)) return;
 
        /* External ring */
        if (!ptarray_has_orientation(poly->rings[0], orientation))
                ptarray_reverse_in_place(poly->rings[0]);
 
        /* Internal rings must run opposite to external */
        for (uint32_t i = 1; i < poly->nrings; i++)
                if (!ptarray_has_orientation(poly->rings[i], -1 * orientation))
                        ptarray_reverse_in_place(poly->rings[i]);
}

References LW_NONE, lwpoly_is_empty(), LWPOLY::nrings, ptarray_has_orientation(), ptarray_reverse_in_place(), and LWPOLY::rings.

Referenced by lwgeom_force_orientation().

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