Jangaroo等宽高瀑布流算法

[code]
//data.json
{
"items": [{
"img_url": "imgs/anjuke.png",
"link_url": "http://www.amyflash.com",
"intro": "it is a message"
}, {
"img_url": "imgs/yile.png",
"link_url": "http://www.amyflash.com",
"intro": "it is a message"
}, {
"img_url": "imgs/ctrip.png",
"link_url": "http://www.amyflash.com",
"intro": "it is a message"
}, {
"img_url": "imgs/lifevc.png",
"link_url": "http://www.amyflash.com",
"intro": "it is a message"
}, {
"img_url": "imgs/xdf.png",
"link_url": "http://www.amyflash.com",
"intro": "it is a message"
}, {
"img_url": "imgs/taoche.png",
"link_url": "http://www.amyflash.com",
"intro": "it is a message"
}, {
"img_url": "imgs/fanke.png",
"link_url": "http://www.amyflash.com",
"intro": "it is a message"
}

]

}
[/code]

package com.acme.jooflash
{
	import flash.display.DisplayObject;
	import flash.display.Loader;
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.events.MouseEvent;
	import flash.external.ExternalInterface;
	import flash.net.URLLoader;
	import flash.net.URLRequest;
	import flash.text.TextField;

	import joo.getQualifiedObject;
	import js.Document;

	/**
	 * ...
	 * @author harriet
	 */
	[SWF( backgroundColor='0xFFFFFF', frameRate='30', width='640', height='480')]
	public class Main extends Sprite 
	{
		private var sw:Number = 800;
		private var sh:Number = 700;

		private var dataloader:URLLoader = new URLLoader();
		private var count:Number = 0;

		private var top:int = 100;
		private var left:int = 100;

		public function Main() 
		{
			if (ExternalInterface.available) {
				sw = ExternalInterface.call("getw");
				sh = ExternalInterface.call("geth");
			}

			this.stage.stageWidth = sw;
			this.stage.stageHeight = sh;

			var surl:String = "data.json";
			var surlr:URLRequest = new URLRequest(surl);
			dataloader.load(surlr);
			dataloader.addEventListener(Event.COMPLETE, getData);

		}

		private function getData(e:Event):void
		{
			 var sMyString:String = dataloader.data;
			 var t:Object = window['JSON'].parse(sMyString);
			 count = t.items.length;

			for each(var item in t.items )
			{

				var url:String = item.img_url;

				var urlr:URLRequest = new URLRequest(url);
				var loader:Loader = new Loader();
				loader.load(urlr);
				loader.contentLoaderInfo.addEventListener(Event.COMPLETE, doShow);
			}
		}

		private var right:Number;

		private var viewi:int = 0;
		private var pviewi:int = 0;
		private var dx:int = 10;
		private var dy:int = 10;
		private var pline:int = -1;
		private function doShow(e:Event):void
		{

			var t:DisplayObject = (e.target.loader as Loader).content;
			 right = sw - left - t.width;
			addChild(t);

			t.x = left + (t.width + dx) * viewi++;
			t.y = top;
			if (t.x > right)
			{
				if(pline==-1)
				{
					pline = viewi-1;
					trace(pline);//求出多少列
				}

				pviewi = viewi-1;
				if (pline != 0)
				{
					t.y = top+Math.floor(pviewi / pline) * (t.height + dy);
					t.x = left + (t.width + dx) * (pviewi % pline);
				}else
				{
					t.x = 5;
					t.y = 5 + pviewi * (t.height + dy);
				}	
			}

		}

	}
}