lwpoly_force_clockwise()

void lwpoly_force_clockwise

(

LWPOLY *

poly

)

Definition at line 270 of file lwpoly.c.

References lwpoly_is_empty(), LWPOLY::nrings, ptarray_isccw(), ptarray_reverse(), and LWPOLY::rings.

Referenced by lwgeom_force_clockwise().

{
        int i;

        /* No-op empties */
        if ( lwpoly_is_empty(poly) )
                return;

        /* External ring */
        if ( ptarray_isccw(poly->rings[0]) )
                ptarray_reverse(poly->rings[0]);

        /* Internal rings */
        for (i=1; i<poly->nrings; i++)
                if ( ! ptarray_isccw(poly->rings[i]) )
                        ptarray_reverse(poly->rings[i]);

}

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