connection style for arrows

[chaffra]

It would be nice to have orthogonal and other types of connection style arrows when adding annotations. Matplotlib has something like:

import matplotlib.pyplot as plt

fig, ax = plt.subplots()

ax.plot([1, 2, 3], [4, 5, 2])

# Annotate with a connection line
ax.annotate("Important Point", xy=(2, 5), xytext=(1.5, 5.5),
            arrowprops=dict(arrowstyle="->", connectionstyle="arc3,rad=0.2"))

plt.show()

This would be useful for linking bars in timeline for example. Right now if you annotate the bar chart you can only add straight arrows.

[gvwilson]

Thanks for the feature request @chaffra - I've added it to our backlog, but realistically we're not going to get to this any time soon. If you would like to craft a pull request, we can try to prioritize review. Thanks - @gvwilson