lwpoly_is_clockwise()

int lwpoly_is_clockwise

(

LWPOLY *

poly

)

Definition at line 290 of file lwpoly.c.

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

Referenced by lwgeom_is_clockwise().

{
        int i;

        if ( lwpoly_is_empty(poly) )
                return LW_TRUE;

        if ( ptarray_isccw(poly->rings[0]) )
                return LW_FALSE;

        for ( i = 1; i < poly->nrings; i++)
                if ( !ptarray_isccw(poly->rings[i]) )
                        return LW_FALSE;

        return LW_TRUE;
}

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