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I'm building an app that renders a line graph of the user's wellness over time.

(For example:)

line graph

It also needs to mark the days they took medication. Originally, I wanted to place a dot at the bottom of the graph on any day the user took meds, but I also don't want to limit the number of medications they're tracking, and stacking dots doesn't work too well.

How would you represent that concept?

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Cursor hover tooltips appear at a pre-set distance from the cursor, so you can move them both away to see the obscured part. Why not use that? – user1306322 Feb 1 '14 at 14:32
The user needs to be able to compare treatments to wellness at a glance, no tooltip-hunting – logan m Feb 1 '14 at 16:15
Then half-transparent mark and half-transparent contrast outline. Like white subtitles with black outline, only somewhat transparent, so as not to occlude the graph behind it. – user1306322 Feb 1 '14 at 18:40

I don't know what the two different lines (orange, blue) represent. But as an indicator you could highlight the data point from that particular day in a different color and add the number of medications inside. Scribble

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