ST_BoundingDiagonal()

Datum ST_BoundingDiagonal

(

PG_FUNCTION_ARGS

)

Definition at line 3103 of file lwgeom_functions_basic.c.

{
        GSERIALIZED *geom_out;
        bool fits = PG_GETARG_BOOL(1);
        LWGEOM *lwgeom_out = NULL;
 
        GBOX gbox = {0};
        int hasz;
        int hasm;
        int32_t srid;
 
        POINT4D pt;
        POINTARRAY *pa;
 
        if (fits)
        {
                GSERIALIZED *geom_in = PG_GETARG_GSERIALIZED_P(0);
                LWGEOM *lwgeom_in = lwgeom_from_gserialized(geom_in);
                lwgeom_calculate_gbox(lwgeom_in, &gbox);
                hasz = FLAGS_GET_Z(lwgeom_in->flags);
                hasm = FLAGS_GET_M(lwgeom_in->flags);
                srid = lwgeom_in->srid;
        }
        else
        {
                uint8_t type;
                lwflags_t flags;
                int res = gserialized_datum_get_internals_p(PG_GETARG_DATUM(0), &gbox, &flags, &type, &srid);
                hasz = FLAGS_GET_Z(flags);
                hasm = FLAGS_GET_M(flags);
                if (res == LW_FAILURE)
                {
                        lwgeom_out = lwgeom_construct_empty(LINETYPE, srid, hasz, hasm);
                }
        }
 
        if (!lwgeom_out)
        {
                pa = ptarray_construct_empty(hasz, hasm, 2);
                pt.x = gbox.xmin;
                pt.y = gbox.ymin;
                pt.z = gbox.zmin;
                pt.m = gbox.mmin;
                ptarray_append_point(pa, &pt, LW_TRUE);
                pt.x = gbox.xmax;
                pt.y = gbox.ymax;
                pt.z = gbox.zmax;
                pt.m = gbox.mmax;
                ptarray_append_point(pa, &pt, LW_TRUE);
                lwgeom_out = lwline_as_lwgeom(lwline_construct(srid, NULL, pa));
        }
 
        geom_out = geometry_serialize(lwgeom_out);
        lwgeom_free(lwgeom_out);
 
        PG_RETURN_POINTER(geom_out);
}

References LWGEOM::flags, FLAGS_GET_M, FLAGS_GET_Z, gserialized_datum_get_internals_p(), LINETYPE, LW_FAILURE, LW_TRUE, lwgeom_calculate_gbox(), lwgeom_construct_empty(), lwgeom_free(), lwgeom_from_gserialized(), lwline_as_lwgeom(), lwline_construct(), POINT4D::m, GBOX::mmax, GBOX::mmin, ptarray_append_point(), ptarray_construct_empty(), LWGEOM::srid, POINT4D::x, GBOX::xmax, GBOX::xmin, POINT4D::y, GBOX::ymax, GBOX::ymin, POINT4D::z, GBOX::zmax, and GBOX::zmin.

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