_lwt_UpdateEdgeRingSideFace()

static int _lwt_UpdateEdgeRingSideFace ( LWT_TOPOLOGY *  topo, LWT_EDGERING *  ring, LWT_ELEMID  face  )

static

Definition at line 6347 of file lwgeom_topo.c.

{
  LWT_ISO_EDGE *forward_edges = NULL;
  int forward_edges_count = 0;
  LWT_ISO_EDGE *backward_edges = NULL;
  int backward_edges_count = 0;
  int i, ret;
 
  /* Make a list of forward_edges and backward_edges */
 
  forward_edges = lwalloc(sizeof(LWT_ISO_EDGE) * ring->size);
  forward_edges_count = 0;
  backward_edges = lwalloc(sizeof(LWT_ISO_EDGE) * ring->size);
  backward_edges_count = 0;
 
  for ( i=0; i<ring->size; ++i )
  {
    LWT_EDGERING_ELEM *elem = ring->elems[i];
    LWT_ISO_EDGE *edge = elem->edge;
    LWT_ELEMID id = edge->edge_id;
    if ( elem->left )
    {
      LWDEBUGF(3, "Forward edge %d is %d", forward_edges_count, id);
      forward_edges[forward_edges_count].edge_id = id;
      forward_edges[forward_edges_count++].face_left = face;
      edge->face_left = face;
    }
    else
    {
      LWDEBUGF(3, "Backward edge %d is %d", forward_edges_count, id);
      backward_edges[backward_edges_count].edge_id = id;
      backward_edges[backward_edges_count++].face_right = face;
      edge->face_right = face;
    }
  }
 
  /* Update forward edges */
  if ( forward_edges_count )
  {
    ret = lwt_be_updateEdgesById(topo, forward_edges,
                                 forward_edges_count,
                                 LWT_COL_EDGE_FACE_LEFT);
    if ( ret == -1 )
    {
      lwfree( forward_edges );
      lwfree( backward_edges );
      lwerror("Backend error: %s", lwt_be_lastErrorMessage(topo->be_iface));
      return -1;
    }
    if ( ret != forward_edges_count )
    {
      lwfree( forward_edges );
      lwfree( backward_edges );
      lwerror("Unexpected error: %d edges updated when expecting %d (forward)",
              ret, forward_edges_count);
      return -1;
    }
  }
 
  /* Update backward edges */
  if ( backward_edges_count )
  {
    ret = lwt_be_updateEdgesById(topo, backward_edges,
                                 backward_edges_count,
                                 LWT_COL_EDGE_FACE_RIGHT);
    if ( ret == -1 )
    {
      lwfree( forward_edges );
      lwfree( backward_edges );
      lwerror("Backend error: %s", lwt_be_lastErrorMessage(topo->be_iface));
      return -1;
    }
    if ( ret != backward_edges_count )
    {
      lwfree( forward_edges );
      lwfree( backward_edges );
      lwerror("Unexpected error: %d edges updated when expecting %d (backward)",
              ret, backward_edges_count);
      return -1;
    }
  }
 
  lwfree( forward_edges );
  lwfree( backward_edges );
 
  return 0;
}

References LWT_TOPOLOGY_T::be_iface, LWT_EDGERING_ELEM_T::edge, LWT_ISO_EDGE::edge_id, LWT_EDGERING_T::elems, LWT_ISO_EDGE::face_left, LWT_ISO_EDGE::face_right, LWT_EDGERING_ELEM_T::left, lwalloc(), LWDEBUGF, lwerror(), lwfree(), lwt_be_lastErrorMessage(), lwt_be_updateEdgesById(), LWT_COL_EDGE_FACE_LEFT, LWT_COL_EDGE_FACE_RIGHT, and LWT_EDGERING_T::size.

Referenced by _lwt_RegisterFaceOnEdgeSide(), and lwt_Polygonize().

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