Add engine attribute to Graph, and default to 'dot' layout #41
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On #38, we noticed that some position-related attributes are not working (e.g., rankdir). Apparently, the code is using the layout "neato", and the layout that we want to use is "dot".
I've added a field to
Graph
to allow changing the engine. I don't know the details on GraphViz, so I am not sure how adequate the implementation is.I also changed the default to "dot", but I can change it if desired.
I have created a test and an example on the README.