PostGIS  2.5.1dev-r@@SVN_REVISION@@

◆ _lwt_EdgeRingGetBbox()

static GBOX* _lwt_EdgeRingGetBbox ( LWT_EDGERING ring)
static

Definition at line 6388 of file lwgeom_topo.c.

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().

6389 {
6390  int i;
6391 
6392  if ( ! ring->env )
6393  {
6394  LWDEBUGF(2, "Computing GBOX for ring %p", ring);
6395  for (i=0; i<ring->size; ++i)
6396  {
6397  LWT_EDGERING_ELEM *elem = ring->elems[i];
6398  LWLINE *g = elem->edge->geom;
6399  const GBOX *newbox = lwgeom_get_bbox(lwline_as_lwgeom(g));
6400  if ( ! i ) ring->env = gbox_clone( newbox );
6401  else gbox_merge( newbox, ring->env );
6402  }
6403  }
6404 
6405  return ring->env;
6406 }
LWLINE * geom
int gbox_merge(const GBOX *new_box, GBOX *merge_box)
Update the merged GBOX to be large enough to include itself and the new box.
Definition: g_box.c:264
LWT_ISO_EDGE * edge
Definition: lwgeom_topo.c:5951
LWGEOM * lwline_as_lwgeom(const LWLINE *obj)
Definition: lwgeom.c:330
const GBOX * lwgeom_get_bbox(const LWGEOM *lwgeom)
Get a non-empty geometry bounding box, computing and caching it if not already there.
Definition: lwgeom.c:734
LWT_EDGERING_ELEM ** elems
Definition: lwgeom_topo.c:5961
GBOX * gbox_clone(const GBOX *gbox)
Definition: g_box.c:52
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:88
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