ST_BoundingDiagonal()

Datum ST_BoundingDiagonal

(

PG_FUNCTION_ARGS

)

Definition at line 2902 of file lwgeom_functions_basic.c.

{
        GSERIALIZED *geom_in = PG_GETARG_GSERIALIZED_P(0);
        GSERIALIZED *geom_out;
        bool fits = PG_GETARG_BOOL(1);
        LWGEOM *lwgeom_in = lwgeom_from_gserialized(geom_in);
        LWGEOM *lwgeom_out;
        const GBOX *gbox;
        int hasz = FLAGS_GET_Z(lwgeom_in->flags);
        int hasm = FLAGS_GET_M(lwgeom_in->flags);
        int32_t srid = lwgeom_in->srid;
        POINT4D pt;
        POINTARRAY *pa;
 
        if (fits)
        {
                /* unregister any cached bbox to ensure it's recomputed */
                lwgeom_in->bbox = NULL;
        }
 
        gbox = lwgeom_get_bbox(lwgeom_in);
 
        if (!gbox)
        {
                lwgeom_out = lwgeom_construct_empty(LINETYPE, srid, hasz, hasm);
        }
        else
        {
                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));
        }
 
        lwgeom_free(lwgeom_in);
        PG_FREE_IF_COPY(geom_in, 0);
 
        geom_out = geometry_serialize(lwgeom_out);
        lwgeom_free(lwgeom_out);
 
        PG_RETURN_POINTER(geom_out);
}

References LWGEOM::bbox, LWGEOM::flags, FLAGS_GET_M, FLAGS_GET_Z, geometry_serialize(), LINETYPE, LW_TRUE, lwgeom_construct_empty(), lwgeom_free(), lwgeom_from_gserialized(), lwgeom_get_bbox(), 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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