package
{
	import flash.display.Bitmap;
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.text.TextField;
	import flash.text.TextFieldAutoSize;
	import flash.utils.getTimer;
	import flash.system.Capabilities;
	
	[SWF(width="800", height="600", frameRate="900", backgroundColor="#FFFFFF")]
	public class ImageScrollerTest extends Sprite
	{
		// fps counting
		private var fpsTF:TextField;
		public  var fps:Number = 0;
		private var fpsArray:Array;
		private var lastTime:Number;
		
		private var display:Bitmap;
		private var scrollX:Number = 0;
		private var scrollY:Number = 0;
		private var scrollZoom:Number = 1;
		private var browser:String;
		
		[Embed(source="grafitti.jpg")]
        private var img:Class;
        
        private var scroller:ImageScroller;
        
		public function ImageScrollerTest()
		{
			// Grab embedded bitmap
			display = new img() as Bitmap;
			this.addChild(display);
			scroller = new ImageScroller(display.bitmapData);
			display.bitmapData = scroller.data;
			
			// debug
			fpsTF = new TextField();
			fpsTF.autoSize = TextFieldAutoSize.LEFT;
			fpsTF.selectable = false;
			fpsTF.background = true;
			fpsTF.selectable = true;
			addChild(fpsTF);
			fpsArray = new Array();
			browser = "OS: "+Capabilities.os+" - Player Version: "+Capabilities.version;
			
			this.addEventListener(Event.ENTER_FRAME,enterFrame);
		}
		private function enterFrame(e:Event):void
		{
			// change bitmap
			scrollX += 1;
			scrollY += 1;
			scroller.panToAngle(scrollX);
			scroller.tiltToAngle(scrollY);
			scroller.scroll();
			
			// Update the fps variable
			var fps:Number = Math.floor( 1000/(getTimer()-lastTime) );
			fpsArray.push(fps);
			if(fpsArray.length > 200){ fpsArray.shift(); }
			fpsTF.text = browser+" - FPS: "+averageFps();
			lastTime = getTimer();
		}
		/**
        * Calculates the average of an array
        * @method averageFps
        * @return Number
        */
		private function averageFps(): Number
		{
		    var sum:Number = 0;
		    for (var i:uint = 0; i < fpsArray.length; i++) {
		        sum += fpsArray[i];
		    }
		    return Math.floor(sum / fpsArray.length);
		}
	}
}