Adding up several units Mana or Health bar

Hey hey! I'm being thorough and asking here if there is a possibility to (with a macro?) sum several units Mana points, or Health Points and display the result? I wish to simulate maintenance cost, and was going to use the Health or Mana bar to have the individual units maintenance cost, most units with a negative value, and some city tokens with a positive value. Is this already implemented in some way, or should I head to the API forum to start coding? :D

You would have to use the target feature but you will have a set number of targets per macro. The standard targeting system is pretty limited that way. So say that bar 1 is the Mana points and bar 2 is the Health points and you have 5 tokens representing your resources we would write a macro targeting 5 tokens and summing those bars up.  &{template:default} {{name=Resources (5) total}} {{Mana Total=[[@{target|target1|bar1} + @{target|target2|bar1} + @{target|target3|bar1} + @{target|target4|bar1} + @{target|target5|bar1}]]}} {{Health Total=[[@{target|target1|bar2} + @{target|target2|bar2} + @{target|target3|bar2} + @{target|target4|bar2} + @{target|target5|bar2}]]}} I added a space in the header for a second line there. Hope that helps. edit: removed the extra +'s 

Thanks Ed! That was pretty instructive,  there is an extra "+" sign at the end of each sum that would be nice if you could edit in your post for posterity :) Otherwise, this is more than what I was expecting macros to be capable of, but still less than what's asked of them by me :), I'll head over to the API forum in search of automatic selection of all tokens for this sum Cheers!

Aah, yes, copy past fever there