Composing wakeup criterion

• A behavior can wake up when a set of criterion occur:

  • Criterion are ANDed and ORed together to form wakeup conditions

• For example:

  • Wakeup on any of several AWT events (mouse press, release, or drag)

  • Wakeup on viewer proximity OR after some time has elapsed

• Wakeup conditions can be complex and changing, for example:

  • In a game, the user must press two buttons within a time limit to open a door

    • Behavior's initial wakeup conditions are:

      • Viewer near button 1 or viewer near button 2

  • After button 1 is pressed, conditions become:

    • Viewer near button 2 or time elapsed

  • If time elapses, conditions revert back to the initial one

  • If button 2 is pressed in time, behavior sends event to wakeup door-opening behavior, then exits without rescheduling