ParaView/Python/SavePipelineAsGraph

Summary

The simple API provides functions to manipulate the sources, using graphviz we can save and even show the current Pipeline as a graph, in order to obtain images like this

Script

<source lang="python"> def SavePipelineGraph(path, format="png", view=False):

   """Save the state of the pipelines (aka Sources and Filters) as a graph.
   Specify the path to save the graph to, Optionaly, specify the format to save it to,
   default is "png" but it can be "pdf" for instance. If you want to show it right away,
   set view parameter to True, default is False.
   This method is using graphviz and will save two files. One will be save in the graphviz
   format (.gv), the other one to the specified format.
   """
   try:
     import graphviz
   except ImportError:
     print("Graphviz could not be imported", file=sys.stderr)
     return

   d = graphviz.Digraph()
   activeSource = GetActiveSource()
   sources = GetSources()
   if len(sources) == 0:
     print("Pipeline is empty")
   else:
     for item in sources.items():
       key = item[0]
       source = item[1]
       color = "red" if source == activeSource else "black"
       d.node(key[1], label=key[0], color=color)
       proxy = source.SMProxy
       for i in range(proxy.GetNumberOfProducers()):
         prod = proxy.GetProducerProxy(i)
         if prod.IsTypeOf("vtkSMSourceProxy"):
           d.edge(str(proxy.GetProducerProxy(i).GetGlobalID()), str(key[1]))
     d.format = format
     d.render(path, view=view)

</source>

Then simply call it: <source lang="python">

 SavePipelineGraph("~/pipeline", "pdf")

</source>