_lwt_AddPoint()

static LWT_ELEMID _lwt_AddPoint ( LWT_TOPOLOGY *  topo, LWPOINT *  point, double  tol, int  findFace, int *  moved, int *  numSplitEdges  )

static

Definition at line 6754 of file lwgeom_topo.c.

{
  uint64_t num, i;
  double mindist = FLT_MAX;
  LWT_ISO_NODE *nodes, *nodes2;
  LWT_ISO_EDGE *edges;
  LWGEOM *pt = lwpoint_as_lwgeom(point);
  scored_pointer *sorted;
  int flds;
  LWT_ELEMID id = 0;
 
  /* Get tolerance, if 0 was given */
  if ( tol == -1 )
    tol = _LWT_MINTOLERANCE(topo, pt);
 
  LWDEBUGG(1, pt, "Adding point");
 
  /*
  -- 1. Check if any existing node is closer than the given precision
  --    and if so pick the closest
  TODO: use WithinBox2D
  */
  flds = LWT_COL_NODE_NODE_ID | LWT_COL_NODE_GEOM;
  nodes = lwt_be_getNodeWithinDistance2D(topo, point, tol, &num, flds, 0);
  if (num == UINT64_MAX)
  {
    PGTOPO_BE_ERROR();
    return -1;
  }
 
  if ( numSplitEdges ) *numSplitEdges = 0;
 
  if ( num )
  {
    LWDEBUGF(1, "New point is within %.15g units of %llu nodes", tol, num);
    /* Order by distance if there are more than a single return */
    if ( num > 1 )
    {{
      sorted = lwalloc(sizeof(scored_pointer)*num);
      for (i=0; i<num; ++i)
      {
        sorted[i].ptr = nodes+i;
        sorted[i].score = lwgeom_mindistance2d(lwpoint_as_lwgeom(nodes[i].geom), pt);
        LWDEBUGF(1, "Node %" LWTFMT_ELEMID " distance: %.15g",
          ((LWT_ISO_NODE*)(sorted[i].ptr))->node_id, sorted[i].score);
      }
      qsort(sorted, num, sizeof(scored_pointer), compare_scored_pointer);
      nodes2 = lwalloc(sizeof(LWT_ISO_NODE)*num);
      for (i=0; i<num; ++i)
      {
        nodes2[i] = *((LWT_ISO_NODE*)sorted[i].ptr);
      }
      lwfree(sorted);
      lwfree(nodes);
      nodes = nodes2;
    }}
 
    for ( i=0; i<num; ++i )
    {
      LWT_ISO_NODE *n = &(nodes[i]);
      LWGEOM *g = lwpoint_as_lwgeom(n->geom);
      double dist = lwgeom_mindistance2d(g, pt);
      /* TODO: move this check in the previous sort scan ... */
      /* must be closer than tolerated, unless distance is zero */
      if ( dist && dist >= tol ) continue;
      if ( ! id || dist < mindist )
      {
        id = n->node_id;
        mindist = dist;
      }
    }
    if ( id )
    {
      /* found an existing node */
      if ( nodes ) _lwt_release_nodes(nodes, num);
      if ( moved ) *moved = mindist == 0 ? 0 : 1;
      return id;
    }
  }
 
  initGEOS(lwnotice, lwgeom_geos_error);
 
  /*
  -- 2. Check if any existing edge falls within tolerance
  --    and if so split it by a point projected on it
  TODO: use WithinBox2D
  */
  flds = LWT_COL_EDGE_ALL; /* EDGE_ID|LWT_COL_EDGE_GEOM;*/
  edges = lwt_be_getEdgeWithinDistance2D(topo, point, tol, &num, flds, 0);
  if (num == UINT64_MAX)
  {
    PGTOPO_BE_ERROR();
    return -1;
  }
  LWDEBUGF(1, "New point is within %.15g units of %llu edges", tol, num);
  if ( num )
  {
    id = _lwt_SplitAllEdgesToNewNode(topo, edges, num, lwgeom_as_lwpoint(pt), tol, moved);
    _lwt_release_edges(edges, num);
    if ( numSplitEdges ) *numSplitEdges = num;
  }
 
  if ( id == 0 )
  {
    /* The point is isolated, add it as such */
    /* TODO: pass 1 as last argument (skipChecks) ? */
    id = _lwt_AddIsoNode(topo, -1, point, 0, findFace);
    if ( moved ) *moved = 0;
    if ( -1 == id )
    {
      /* should have invoked lwerror already, leaking memory */
      _lwt_release_edges(edges, num);
      lwerror("lwt_AddIsoNode failed");
      return -1;
    }
  }
 
  return id;
}

References _lwt_AddIsoNode(), _LWT_MINTOLERANCE, _lwt_release_edges(), _lwt_release_nodes(), _lwt_SplitAllEdgesToNewNode(), compare_scored_pointer(), LWT_ISO_NODE::geom, lwalloc(), LWDEBUGF, LWDEBUGG, lwerror(), lwfree(), lwgeom_as_lwpoint(), lwgeom_geos_error(), lwgeom_mindistance2d(), lwnotice(), lwpoint_as_lwgeom(), lwt_be_getEdgeWithinDistance2D(), lwt_be_getNodeWithinDistance2D(), LWT_COL_EDGE_ALL, LWT_COL_NODE_GEOM, LWT_COL_NODE_NODE_ID, LWTFMT_ELEMID, LWT_ISO_NODE::node_id, PGTOPO_BE_ERROR, scored_pointer_t::ptr, and scored_pointer_t::score.

Referenced by _lwt_AddLineEdge(), lwt_AddPoint(), and lwt_LoadPoint().

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