For a line chart, I would like the user to be able to drill-down and look at how specific groups are fairing over time. First, there is the selection of dimension and then groups within that dimension. I could use a single menu, two dropdowns, a combination of dropdown and buttons or possibly other more creative solutions.
Do you get any ideas on what would be an interesting/user-friendly way to navigate these?
(The idea is that the actual lines animate when you select a group/click a button.)