/**
 * VERSION: 1.6
 * DATE: 10/19/2009
 * ACTIONSCRIPT VERSION: 3.0 
 * UPDATES AND DOCUMENTATION AT: http://www.TweenMax.com
 **/
package com.greensock.plugins {
    import com.greensock.*;
    
    import flash.display.*;
/**
 * Tweens numbers in an Array. <br /><br />
 * 
 * <b>USAGE:</b><br /><br />
 * <code>
 *         import com.greensock.TweenLite; <br />
 *         import com.greensock.plugins.TweenPlugin; <br />
 *         import com.greensock.plugins.EndArrayPlugin; <br />
 *         TweenPlugin.activate([EndArrayPlugin]); //activation is permanent in the SWF, so this line only needs to be run once.<br /><br />
 * 
 *         var myArray:Array = [1,2,3,4];<br />
 *         TweenLite.to(myArray, 1.5, {endArray:[10,20,30,40]}); <br /><br />
 * </code>
 * 
 * <b>Copyright 2010, GreenSock. All rights reserved.</b> This work is subject to the terms in <a href="http://www.greensock.com/terms_of_use.html">http://www.greensock.com/terms_of_use.html</a> or for corporate Club GreenSock members, the software agreement that was issued with the corporate membership.
 * 
 * @author Jack Doyle, jack@greensock.com
 */    
    public class EndArrayPlugin extends TweenPlugin {
        /** @private **/
        public static const API:Number = 1.0; //If the API/Framework for plugins changes in the future, this number helps determine compatibility
        
        /** @private **/
        protected var _a:Array;
        /** @private **/
        protected var _info:Array = [];
        
        /** @private **/
        public function EndArrayPlugin() {
            super();
            this.propName = "endArray"; //name of the special property that the plugin should intercept/manage
            this.overwriteProps = ["endArray"];
        }
        
        /** @private **/
        override public function onInitTween(target:Object, value:*, tween:TweenLite):Boolean {
            if (!(target is Array) || !(value is Array)) {
                return false;
            }
            init(target as Array, value);
            return true;
        }
        
        /** @private **/
        public function init(start:Array, end:Array):void {
            _a = start;
            var i:int = end.length;
            while (i--) {
                if (start[i] != end[i] && start[i] != null) {
                    _info[_info.length] = new ArrayTweenInfo(i, _a[i], end[i] - _a[i]);
                }
            }
        }
        
        /** @private **/
        override public function set changeFactor(n:Number):void {
            var i:int = _info.length, ti:ArrayTweenInfo;
            if (this.round) {
                var val:Number;
                while (i--) {
                    ti = _info[i];
                    val = ti.start + (ti.change * n);
                    _a[ti.index] = (val > 0) ? int(val + 0.5) : int(val - 0.5); //4 times as fast as Math.round()
                }
            } else {
                while (i--) {
                    ti = _info[i];
                    _a[ti.index] = ti.start + (ti.change * n);
                }
            }
        }
        
    }
}

internal class ArrayTweenInfo {
    public var index:uint;
    public var start:Number;
    public var change:Number;
    
    public function ArrayTweenInfo(index:uint, start:Number, change:Number) {
        this.index = index;
        this.start = start;
        this.change = change;
    }
}