/*
Script: Fx.Elements.js
  Effect to change any number of CSS properties of any number of Elements.
 
License:
  MIT-style license.
*/
 
Fx.Elements = new Class({
 
  Extends: Fx.CSS,
 
  initialize: function(elements, options){
    this.elements = this.subject = $$(elements);
    this.parent(options);
  },
 
  compute: function(from, to, delta){
    var now = {};
    for (var i in from){
      var iFrom = from[i], iTo = to[i], iNow = now[i] = {};
      for (var p in iFrom) iNow[p] = this.parent(iFrom[p], iTo[p], delta);
    }
    return now;
  },
 
  set: function(now){
    for (var i in now){
      var iNow = now[i];
      for (var p in iNow) this.render(this.elements[i], p, iNow[p], this.options.unit);
    }
    return this;
  },
 
  start: function(obj){
    if (!this.check(arguments.callee, obj)) return this;
    var from = {}, to = {};
    for (var i in obj){
      var iProps = obj[i], iFrom = from[i] = {}, iTo = to[i] = {};
      for (var p in iProps){
        var parsed = this.prepare(this.elements[i], p, iProps[p]);
        iFrom[p] = parsed.from;
        iTo[p] = parsed.to;
      }
    }
    return this.parent(from, to);
  }
 
});