package {

	import flash.display.Bitmap;
	import flash.display.BitmapData;
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.utils.getTimer;

	[SWF(width=400, height=300, backgroundColor=0x000000)]

	/**
	* Demonstrates BitmapData's noise() method by creating animated television white noise.
	*/
	public class graphic_flex_image_effects_04_Flex_NoiseTest extends Sprite {

		private var _bitmapData:BitmapData;

		/**
		* Constructor. Creates bitmap and handler for ENTER_FRAME for animation.
		*/
		public function graphic_flex_image_effects_04_Flex_NoiseTest() {
			_bitmapData = new BitmapData(stage.stageWidth, stage.stageHeight);
			makeNoise();
			addChild(new Bitmap(_bitmapData));
			addEventListener(Event.ENTER_FRAME, onSpriteEnterFrame);
		}

		/**
		* Generates noise in the bitmap data.
		*/
		private function makeNoise():void {
			_bitmapData.noise(getTimer(), 100, 255, 7, true);
		}

		/**
		* Generates new noise every frame.
		*/
		private function onSpriteEnterFrame(event:Event):void {
			makeNoise();
		}

	}

}