Added interactive mode

[ixkael]

I’ve added a few functions to make possible the interactive modification of the graph once it is rendered. Just set pgm.render(interactive=True). All the demos work as usual. There are a few new classes and functions because I want to drag and drop Nodes and Plates only, with an automatic move of the labels and also the arrows. Finally, one can do print(pgm) to get the new positions of the Nodes/Plates.

[davidwhogg]

The horror!

[drphilmarshall]

I don't see any tutorial/user guide documentation on interactive drawing in this branch - what's the plan here? It looks like you are using the matplotlib gui, is that right? Will I be able to make interactive diagrams in a notebook?

[ixkael]

All the examples can be run with pgm.render(interactive=True) in the Terminal.

Good point about the notebook - I can add an example / tutorial.

[drphilmarshall]

Cool, thanks! If you tweet it working interactively in mybinder I'll buy you a kwak.

[ixkael]

Quick update: I've added a notebook example (just the classic example but in a notebook)

[drphilmarshall]

@ixkael If you know this is going to work, I guess we should change all these drphilmarshall URLs to dfm ones instead...

[drphilmarshall]

@ixkael I still see drphilmarshall URLs... but you must be so close to that Kwak by now! :-)