The Addon BarTracker logs the changes of the health and mana/rage/energy bars, and logs them. After a fight, it draws a diagram. The newest versions also log combat text, and allow detailed analysis with a filter. It's movable (shift click) and resizable (alt click), and can show a tooltip with additional statistics. Some commands can be reached with the right click menu. More commands are available with the /bartracker slash command:

    * /bartracker show [on|off]
    * /bartracker scale <num>
    * /bartracker timescale <num>, auto when 0
    * /bartracker timeout <num>
    * /bartracker combatlog [on|off]
    * /bartracker combatfade [on|off]
    * /bartracker targethealth [on|off]
    * /bartracker liveupdate [on|off]
    * /bartracker load <numame>
    * /bartracker store <numame>
    * /bartracker list
    * /bartracker delete <numame>
    * /bartracker start
    * /bartracker pause

    *  r2
          o Fixed Live-Update's scrolling and text/marks
          o Fixed target health scale to be in percent
    *  r1
          o Changed to a new version number scheme
          o Added multi-power support for druids that switch forms
          o Added runic power support for death knights
          o Code redesign
          o Incompatible log format
    *  0.90
          o Changed handlers from using globals to using local parameters
          o Changed UIDropDown menu to deal with additional self parameter
          o TOC change for WotLK
    *  0.80
          o Support for new Combat log in 2.4.
          o Uses blizzard combat log formating function and settings.
    *  0.72
          o Redrawing is now faster with large datasets and small scaling.
    *  0.71
          o Now also tracks enemy health
    *  0.70
          o Live update of graph in combat
    *  0.60
          o Fixed some bugs which have been forgotten to be fixed again...
