ST_LineCrossingDirection()

Datum ST_LineCrossingDirection

(

PG_FUNCTION_ARGS

)

Definition at line 469 of file lwgeom_functions_analytic.c.

{
        int type1, type2, rv;
        LWLINE *l1 = NULL;
        LWLINE *l2 = NULL;
        GSERIALIZED *geom1 = PG_GETARG_GSERIALIZED_P(0);
        GSERIALIZED *geom2 = PG_GETARG_GSERIALIZED_P(1);
 
        gserialized_error_if_srid_mismatch(geom1, geom2, __func__);
 
        type1 = gserialized_get_type(geom1);
        type2 = gserialized_get_type(geom2);
 
        if ( type1 != LINETYPE || type2 != LINETYPE )
        {
                elog(ERROR,"This function only accepts LINESTRING as arguments.");
                PG_RETURN_NULL();
        }
 
        l1 = lwgeom_as_lwline(lwgeom_from_gserialized(geom1));
        l2 = lwgeom_as_lwline(lwgeom_from_gserialized(geom2));
 
        rv = lwline_crossing_direction(l1, l2);
 
        PG_FREE_IF_COPY(geom1, 0);
        PG_FREE_IF_COPY(geom2, 1);
 
        PG_RETURN_INT32(rv);
 
}

References gserialized_error_if_srid_mismatch(), gserialized_get_type(), LINETYPE, lwgeom_as_lwline(), lwgeom_from_gserialized(), and lwline_crossing_direction().

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