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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){},
})
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