PostGIS  2.1.10dev-r@@SVN_REVISION@@
 static CIRC_NODE* lwcollection_calculate_circ_tree ( const LWCOLLECTION * lwcol )
static

Definition at line 865 of file lwgeodetic_tree.c.

Referenced by lwgeom_calculate_circ_tree().

866 {
867  int i = 0, j = 0;
868  CIRC_NODE** nodes;
869  CIRC_NODE* node;
870
871  /* One geometry? Done! */
872  if ( lwcol->ngeoms == 1 )
873  return lwgeom_calculate_circ_tree(lwcol->geoms[0]);
874
875  /* Calculate a tree for each sub-geometry*/
876  nodes = lwalloc(lwcol->ngeoms * sizeof(CIRC_NODE*));
877  for ( i = 0; i < lwcol->ngeoms; i++ )
878  {
879  node = lwgeom_calculate_circ_tree(lwcol->geoms[i]);
880  if ( node )
881  nodes[j++] = node;
882  }
883  /* Put the trees into a spatially correlated order */
884  circ_nodes_sort(nodes, j);
885  /* Merge the trees pairwise up to a parent node and return */
886  node = circ_nodes_merge(nodes, j);
887  /* Don't need the working list any more */
888  lwfree(nodes);
889
890  node->geom_type = lwgeom_get_type((LWGEOM*)lwcol);
891
892  return node;
893 }
Note that p1 and p2 are pointers into an independent POINTARRAY, do not free them.
void lwfree(void *mem)
Definition: lwutil.c:190
uint32_t lwgeom_get_type(const LWGEOM *geom)
Return LWTYPE number.
Definition: lwgeom.c:785
CIRC_NODE * lwgeom_calculate_circ_tree(const LWGEOM *lwgeom)
LWGEOM ** geoms
Definition: liblwgeom.h:465
static CIRC_NODE * circ_nodes_merge(CIRC_NODE **nodes, int num_nodes)
static void circ_nodes_sort(CIRC_NODE **nodes, int num_nodes)
Given a list of nodes, sort them into a spatially consistent order, then pairwise merge them up into ...
void * lwalloc(size_t size)
Definition: lwutil.c:175

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