ST_BoundingDiagonal()

Datum ST_BoundingDiagonal

(

PG_FUNCTION_ARGS

)

Definition at line 2884 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);
  int 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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