[interface(?)]: Plot key game statistics after scenario

[Telcontar]

Some strategy games such as Age of Empires show a plot of the key statistics after a game:



I think this would be nice to have for Wesnoth as well. It would also be suitable as a Google Summer of Code project, as it's not too difficult to implement.

Some ideas for statistics to plot:

• Number of units
• Overall strength of units (for example, number multiplied by level multiplied by % of max HP)
• Area "controlled" by player (to simplify, number of tiles reachable in next turn)
• Total gold accumulated over the game (including spent gold)
• Total gold value of all units

I know that this does not show at all, for example, how well a player has used units on given terrain. However, it may give some players a general feel of how a battle evolved, and provides some eye candy after a game (being prettier than a text-based summary). Of course some players may not care much, but if the graph is generated without much run-time overhead, those players can just skip the screen.