Annotation Feature

I think having an annotation feature that lets you put some extra data available on the chart would be very helpful. It could be a target with callbacks similar to tooltips, so you could choose to have extra data displayed on hover. There are a lot of different ways to make annotations, here are a few:

Axis Marker

Axis marker annotation

Series Marker

Axis marker annotation

Horizontal / Vertical Lines

I’m torn on whether these should exist in a data series, but that usually only works for either horizontal or vertical
Horizontal marker annotation

Vertical marker annotation

Alternative implementations

Google Charts has implemented this by adding Role as an option – @etimberg & @tannerlinsley – I think we should seriously take a look at how we plan on supporting those options beyond just annotations while we still have some API flexibility.

Author: Fantashit

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