geography_shortestline()

Datum geography_shortestline

(

PG_FUNCTION_ARGS

)

Definition at line 1443 of file geography_measurement.c.

{
        GSERIALIZED* g1 = PG_GETARG_GSERIALIZED_P(0);
        GSERIALIZED* g2 = PG_GETARG_GSERIALIZED_P(1);
        bool use_spheroid = PG_GETARG_BOOL(2);
        LWGEOM *line, *lwgeom1, *lwgeom2;
        GSERIALIZED* result;
        SPHEROID s;
 
        gserialized_error_if_srid_mismatch(g1, g2, __func__);
 
        lwgeom1 = lwgeom_from_gserialized(g1);
        lwgeom2 = lwgeom_from_gserialized(g2);
 
        /* Return NULL on empty/bad arguments. */
        if ( !lwgeom1 || !lwgeom2 || lwgeom_is_empty(lwgeom1) || lwgeom_is_empty(lwgeom2) )
        {
                PG_FREE_IF_COPY(g1, 0);
                PG_FREE_IF_COPY(g2, 1);
                PG_RETURN_NULL();
        }
 
        /* Initialize spheroid */
        spheroid_init_from_srid(gserialized_get_srid(g1), &s);
 
        /* Set to sphere if requested */
        if ( ! use_spheroid )
                s.a = s.b = s.radius;
 
        line = geography_tree_shortestline(lwgeom1, lwgeom2, FP_TOLERANCE, &s);
 
        if (lwgeom_is_empty(line))
                PG_RETURN_NULL();
 
        result = geography_serialize(line);
        lwgeom_free(line);
 
        PG_FREE_IF_COPY(g1, 0);
        PG_FREE_IF_COPY(g2, 1);
        PG_RETURN_POINTER(result);
}

References FP_TOLERANCE, geography_tree_shortestline(), gserialized_error_if_srid_mismatch(), gserialized_get_srid(), lwgeom_free(), lwgeom_from_gserialized(), lwgeom_is_empty(), result, and s.

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