_lwt_EdgeRingGetBbox()

static GBOX* _lwt_EdgeRingGetBbox ( LWT_EDGERING *  ring )

static

Definition at line 6476 of file lwgeom_topo.c.

{
  int i;
 
  if ( ! ring->env )
  {
    LWDEBUGF(2, "Computing GBOX for ring %p", ring);
    for (i=0; i<ring->size; ++i)
    {
      LWT_EDGERING_ELEM *elem = ring->elems[i];
      LWLINE *g = elem->edge->geom;
      const GBOX *newbox = lwgeom_get_bbox(lwline_as_lwgeom(g));
      if ( ! i ) ring->env = gbox_clone( newbox );
      else gbox_merge( newbox, ring->env );
    }
  }
 
  return ring->env;
}

References LWT_EDGERING_ELEM_T::edge, LWT_EDGERING_T::elems, LWT_EDGERING_T::env, gbox_clone(), gbox_merge(), LWT_ISO_EDGE::geom, LWDEBUGF, lwgeom_get_bbox(), lwline_as_lwgeom(), and LWT_EDGERING_T::size.

Referenced by _lwt_FindFaceContainingRing(), and _lwt_RegisterFaceOnEdgeSide().

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