The main animation interface. It can take a single option object or an array of option objects if you want to chain animations without falling into Callback Hell.

Use this method to extend the private Easing collection.

The customEasings object should like this :

    {
        "easingName": function(p) { easing algorithm }
    }

When used, easing functions are passed the following arguments :

• percent
• percent * duration

Easing functions are obviously expected to return the eased percent.

Use this method to extend _tweenPropHooks.

The customHooks object should like this :

    {
        "propertyName": {
            set: function() {},
            get: function() {},
            ease: function() {}
        }
    }

Each hook can contain a get, set and ease functions. When these functions are used, they are passed only one argument : the Tween object, exept for the ease() function which gets the eased percent as second parameter.

• The get() function must return the current value of the Tween.item's property.
• The set() function must set the value of the Tween.item's property with Tween.now (which will most likely be the result of get() or ease())
• The ease() function must return the eased value. The second parameter is the eased percent.

Stops all animations on the item. If goToEnd is true, the animated properties will be set to their final values.