_lwt_AddIsoNode()

static LWT_ELEMID _lwt_AddIsoNode ( LWT_TOPOLOGY *  topo, LWT_ELEMID  face, LWPOINT *  pt, int  skipISOChecks, int  checkFace  )

static

Parameters

checkFace

if non zero will check the given face for really containing the point or determine the face when given face is -1. Use 0 to simply use the given face value, no matter what (effectively allowing adding a non-isolated point when used with face=-1).

Definition at line 517 of file lwgeom_topo.c.

{
  LWT_ELEMID foundInFace = -1;
 
  if ( lwpoint_is_empty(pt) )
  {
    lwerror("Cannot add empty point as isolated node");
    return -1;
  }
 
 
  if ( ! skipISOChecks )
  {
    if ( lwt_be_ExistsCoincidentNode(topo, pt) ) /*x*/
    {
      lwerror("SQL/MM Spatial exception - coincident node");
      return -1;
    }
    if ( lwt_be_ExistsEdgeIntersectingPoint(topo, pt) ) /*x*/
    {
      lwerror("SQL/MM Spatial exception - edge crosses node.");
      return -1;
    }
  }
 
  if ( checkFace && ( face == -1 || ! skipISOChecks ) )
  {
    foundInFace = lwt_be_getFaceContainingPoint(topo, pt); /*x*/
    if ( foundInFace == -2 ) {
      lwerror("Backend error: %s", lwt_be_lastErrorMessage(topo->be_iface));
      return -1;
    }
    if ( foundInFace == -1 ) foundInFace = 0;
  }
 
  if ( face == -1 ) {
    face = foundInFace;
  }
  else if ( ! skipISOChecks && foundInFace != face ) {
#if 0
    lwerror("SQL/MM Spatial exception - within face %d (not %d)",
            foundInFace, face);
#else
    lwerror("SQL/MM Spatial exception - not within face");
#endif
    return -1;
  }
 
  LWT_ISO_NODE node;
  node.node_id = -1;
  node.containing_face = face;
  node.geom = pt;
  if ( ! lwt_be_insertNodes(topo, &node, 1) )
  {
    lwerror("Backend error: %s", lwt_be_lastErrorMessage(topo->be_iface));
    return -1;
  }
 
  return node.node_id;
}

References LWT_TOPOLOGY_T::be_iface, LWT_ISO_NODE::containing_face, LWT_ISO_NODE::geom, lwerror(), lwpoint_is_empty(), lwt_be_ExistsCoincidentNode(), lwt_be_ExistsEdgeIntersectingPoint(), lwt_be_getFaceContainingPoint(), lwt_be_insertNodes(), lwt_be_lastErrorMessage(), and LWT_ISO_NODE::node_id.

Referenced by _lwt_AddPoint(), and lwt_AddIsoNode().

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