[spiel2001]

True... but to be able to do the display information, you have to have the data, which means you have to do the work of a damage meter to collect it in the first place... or try to scrape the data off of another program (such as Skada or Recount)

If you try to scrape it off the other apps, then you have to make your code much more complex and you are at the mercy of the "other" programmers... if they change their mod, they break your mod without warning.

So... in order to present much of the data you're requesting, you first have to collect the damage and heal data in which case you're already doing pretty much all of the work of a Recount/Skada type app.

It is possible to use algorithms as you mention, but they're actually unreliable for a host of reasons... which is why damage meters don't do that either. It also would be impossible to, for example, tell the difference between the heals the tank is receiving versus the damage he is taking... all you have is his current health with no differentiation between how much of that is the result of damage and healing.