         this._stack = []
         this._step = -1
         this._prefixes = {}
+        this._loop = 1
+        this._direction = true
 
         return this
 

            this._callback = undefined
            this._step = -1
            this._stack = []

    window.Moon = Moon

        # play function for intern use
        _play: ->
            this._step += 1
            if this._direction
                step = this._step
            else
                step = this._stack.length - 1 - this._step

            
            anm = this._stack[step]
            if anm?
                # before animation function
                anm.beforeAnimation() if typeof anm.beforeAnimation == "function"
