Provide an option to render arrows between points instead of lines
For example, an arrow would be drawn from each element in a series to the subsequent element.
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kzoon commented
One arrow at the end.
Now I come to think of it: an arrow between the first point of Series 1 and the first point of series 2 (and between second points, third points, etc.) would be very useful too. It could indicate the development between two years.
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It would probably be best implemented as a small plugin. Where would you like your arrows? In the middle of the lines, at the start, at the end? One arrow or multiple arrows?
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kzoon commented
This would be useful with score cards where you can connect a number of scores (through time)
See http://jsfiddle.net/kzoon/uQMCA/2/ for example