Dot.TViewtype vertex = Tree.V.ttype edge = Tree.E.ttype cluster = clusterval view : 
  ?aa:bool ->
  ?delay_node:(vertex -> bool) ->
  ?delay_edge:(edge -> bool) ->
  ?delay_cluster:(cluster -> bool) ->
  ?border_width:int ->
  ?width:int ->
  ?height:int ->
  ?packing:(GObj.widget -> unit) ->
  ?show:bool ->
  (vertex, edge, cluster) Graph.DGraphModel.abstract_model ->
  (vertex, edge, cluster) DGraphView.viewView as a Gnome Canvas. Support zooming and scrolling.