[tor-bugs] #3239 [Metrics Website]: Provide per-country graphs for multiple countries at once

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#3239: Provide per-country graphs for multiple countries at once
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 Reporter:  karsten          |          Owner:  karsten
     Type:  enhancement      |         Status:  new    
 Priority:  minor            |      Milestone:         
Component:  Metrics Website  |        Version:         
 Keywords:                   |         Parent:         
   Points:                   |   Actualpoints:         
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 We have a few graphs showing
 [https://metrics.torproject.org/users.html?graph=direct-users&country=de
 #direct-users statistics per country].  We should allow users to select
 multiple countries to generate a graph with statistics for all selected
 countries.

 The first question is how an intuitive interface for selecting multiple
 countries would look like.  Is a multi-select list box with 247 entries
 even manageable?  What other options are there that don't require
 JavaScript?

 The next question is whether lines should be drawn in different colors
 using a single y axis or as multiple stacked y axes.  The former makes it
 easier to compare absolute numbers to each other, the latter allows to
 compare trends even if absolute numbers have different orders of
 magnitudes.  Both approaches are probably limited to something around 5
 countries at a time before graphs become incomprehensible.  Of course, we
 might offer the user to select one of the graph types without much
 additional effort.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/3239>
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