PostGIS  2.5.0dev-r@@SVN_REVISION@@
static GBOX* _lwt_EdgeRingGetBbox ( LWT_EDGERING ring)
static

Definition at line 6618 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().

6619 {
6620  int i;
6621 
6622  if ( ! ring->env )
6623  {
6624  LWDEBUGF(2, "Computing GBOX for ring %p", ring);
6625  for (i=0; i<ring->size; ++i)
6626  {
6627  LWT_EDGERING_ELEM *elem = ring->elems[i];
6628  LWLINE *g = elem->edge->geom;
6629  const GBOX *newbox = lwgeom_get_bbox(lwline_as_lwgeom(g));
6630  if ( ! i ) ring->env = gbox_clone( newbox );
6631  else gbox_merge( newbox, ring->env );
6632  }
6633  }
6634 
6635  return ring->env;
6636 }
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:6181
LWGEOM * lwline_as_lwgeom(const LWLINE *obj)
Definition: lwgeom.c:329
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:727
LWT_EDGERING_ELEM ** elems
Definition: lwgeom_topo.c:6191
GBOX * gbox_clone(const GBOX *gbox)
Definition: g_box.c:52
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:88

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