Yahoo! UI Library

/**
 * Adds support for the <code>xy</code> property in <code>from</code> and 
 * <code>to</code> attributes.
 * @module anim
 * @submodule anim-xy
 */

var NUM = Number;

Y.Anim.behaviors.xy = {
    set: function(anim, att, from, to, elapsed, duration, fn) {
        anim._node.setXY([
            fn(elapsed, NUM(from[0]), NUM(to[0]) - NUM(from[0]), duration),
            fn(elapsed, NUM(from[1]), NUM(to[1]) - NUM(from[1]), duration)
        ]);
    },
    get: function(anim) {
        return anim._node.getXY();
    }
};