lwt_MoveIsoNode()

int lwt_MoveIsoNode	(	LWT_TOPOLOGY *	topo,
		LWT_ELEMID	node,
		LWPOINT *	pt
	)

Move an isolated node.

For ST_MoveIsoNode

Parameters

topo	the topology to operate on
node	the identifier of the nod to be moved
pt	the new node position

Returns

0 on success, -1 on error (liblwgeom error handler will be invoked with error message)

Definition at line 3644 of file lwgeom_topo.c.

{
  LWT_ISO_NODE *node;
  int ret;
  int newPointFace;
 
  node = _lwt_GetIsoNode( topo, nid );
  if ( ! node ) return -1;
 
  if ( lwt_be_ExistsCoincidentNode(topo, pt) )
  {
    lwfree(node);
    lwerror("SQL/MM Spatial exception - coincident node");
    return -1;
  }
 
  if ( lwt_be_ExistsEdgeIntersectingPoint(topo, pt) )
  {
    lwfree(node);
    lwerror("SQL/MM Spatial exception - edge crosses node.");
    return -1;
  }
 
  /* Check that the new point is in the same containing face !
   * See https://trac.osgeo.org/postgis/ticket/3232 */
  newPointFace = lwt_GetFaceContainingPoint(topo, pt);
  if ( newPointFace == -1 ) {
    lwerror("Backend error: %s", lwt_be_lastErrorMessage(topo->be_iface));
    return -1;
  }
  if ( node->containing_face != newPointFace )
  {
    lwfree(node);
    lwerror("Cannot move isolated node across faces");
    return -1;
  }
 
  node->node_id = nid;
  node->geom = pt;
  ret = lwt_be_updateNodesById(topo, node, 1,
                               LWT_COL_NODE_GEOM);
  if ( ret == -1 ) {
    lwfree(node);
    lwerror("Backend error: %s", lwt_be_lastErrorMessage(topo->be_iface));
    return -1;
  }
 
  lwfree(node);
  return 0;
}

References _lwt_GetIsoNode(), LWT_TOPOLOGY_T::be_iface, LWT_ISO_NODE::containing_face, LWT_ISO_NODE::geom, lwerror(), lwfree(), lwt_be_ExistsCoincidentNode(), lwt_be_ExistsEdgeIntersectingPoint(), lwt_be_lastErrorMessage(), lwt_be_updateNodesById(), LWT_COL_NODE_GEOM, lwt_GetFaceContainingPoint(), and LWT_ISO_NODE::node_id.

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