Define custom artists

[ColCarroll]

Apparently this can give us very close control over drawing, binning, and aggregating. This does not look like the right tutorial, but might be close.

https://matplotlib.org/users/artists.html

[ColCarroll]

There's an example of a custom artist here: https://github.com/networkx/grave/blob/master/grave/grave.py#L221

[ColCarroll]

And here: https://github.com/pyviz/datashader/pull/200

https://github.com/astrofrog/mpl-scatter-density