I basically did the same thing with the rage bar that i did with the HP bar, plus a few extra things. Rage is calculated off of damage like the hp bars basically.
 ____  _____  __  __  _  _  ___  _  _ 
(  _ \(  _  )(  )(  )( \( )/ __)( \/ )
 ) _ < )(_)(  )(__)(  )  (( (__  \  / 
(____/(_____)(______)(_)\_)\___) (__)