ST_IsPolygonCCW()

Datum ST_IsPolygonCCW

(

PG_FUNCTION_ARGS

)

Definition at line 1303 of file lwgeom_functions_analytic.c.

{
        GSERIALIZED* geom;
        LWGEOM* input;
        bool is_ccw;
 
        if (PG_ARGISNULL(0))
                PG_RETURN_NULL();
 
        geom = PG_GETARG_GSERIALIZED_P_COPY(0);
        input = lwgeom_from_gserialized(geom);
        lwgeom_reverse_in_place(input);
        is_ccw = lwgeom_is_clockwise(input);
        lwgeom_free(input);
        PG_FREE_IF_COPY(geom, 0);
 
        PG_RETURN_BOOL(is_ccw);
}

References lwgeom_free(), lwgeom_from_gserialized(), lwgeom_is_clockwise(), and lwgeom_reverse_in_place().

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