var AnimatedView = View.extend({

  _animating: false,
  last_t: 0,
  
  startAnimating: function(){
    if (this._animating) return
    this._animating = true
    this._animate()
  },

	stopAnimating: function(){
	  this._animating = false
	},

	_animate: function(t){
	  if (! this._animating) return

    requestAnimationFrame(this._animate.bind(this))
    
    var dt = t - this.last_t
    this.last_t = t

    if (! t) return
    
    this.animate(t, dt)
	},
	
	animate: function(t, dt){},

})