Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2077#issuecomment-53654943
I'd be interesting to see what you come up with for rendering DAGs with
tree layouts. I faced a similar problem last year when working on a
visualization class project called
[DeepViz](https://github.com/bruckner/deepViz). In our project, we wanted to
display a DAG that described the layers of a multi-layer neutral network while
supporting interaction with the DAG (e.g. click on a layer to change the main
display).
We ended up using GraphViz to render a SVG and used JQuery to attach event
handlers to the rendered SVG elements. I think that there may be libraries
that use the output of GraphViz's layout engine (running on the server side)
but render the actual graph in D3.
I recently used a Graphviz + SVG + Javascript setup in a research prototype
(we were visualizing large program lineage graphs); I chose this solution
instead of the pure-Javascript `.dot`-to-SVG libraries because our graphs were
fairly complicated and those libraries didn't support many features of the DOT
language.
My guess is that we won't want to pull in GraphViz as a dependency, though.
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