   @name beforeDraw
   @methodOf Engine#
   @event
-
   @params {PowerCanvas} canvas A reference to the canvas to draw on.
   ###
 

  @name beforeAdd
  @methodOf Engine#
  @event

  @param {Object} entityData
  ###


  @name overlay
  @methodOf Engine#
  @event
  @params {PowerCanvas} canvas A reference to the canvas to draw on. 
  ###

