anchor.diff:  
   === Trigger
   
  -If you build up your game world's activites from Action, Trigger is the brick to build Gameplay. It's the combination of : Event + Condition → Action 
  +If you build up your game world's activites from Action, Trigger is the brick to build Gameplay. It's the combination of : Event + Condition → Action
   
   The concept of trigger can be describle like this: When an Event happen, if it's passed a Condition check, the Action is taken. A more detailed description envolve: the Enviroment - a specific Context of those 3 (E - C - A), Durations , Threaded or not, Executor … But here we concern the most simple form, the Context is the single specific that procedure the Event and its Global awareness.
   
   In Groovy,
   
   *  Event is Class based, mentioned in the chapter above.
  -*  Condition can be modeled with a Closure 
  +*  Condition can be modeled with a Closure
   *  Action also very suitable with a Closure representation.
   
   
  -===== Example1:
  +==== Example1:
   
   [source,java]
   ----
  
positive.code: }
  
  class CustomEvent{
      
  }
  handler = new EventHandler();
  eventBus.register(handler);
  
negative.code: = groovy_event
  :author:
  :revnumber:
  :revdate: 2016/03/17 20:48
  :relfileprefix: ../../
  :imagesdir: ../..
  