It would be useful to have a graphic that just creates a bunch of inf lines to display things a like stim onsets/offsets etc.

There's a few ways to do this. Specify the positions of pairs of points for each line? Could also just give a 1d array of values and specify to render an inf line at each of these values along the x, y or z axis?

@clewis7 @apasarkar @FlynnOConnell would this be useful for any of your stuff? I came up with this because it's useful for behavior data in the NDWidget, instead of using dots to display timepoints for behavior or stimulus events.