flipbook.as3

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" applicationComplete="init()">
	<mx:Canvas id="cnv" />
	<mx:Script>
		<![CDATA[
		
			[Embed(source="../assets/spritesheet.png")]
			private var Sheet:Class;

			private static const FRAME_WIDTH:uint = 65;
			private static const FRAME_HEIGHT:uint = 100;			
			private static const NUM_FRAMES:uint = 3;

			private var source:Bitmap;
			private var clip:Bitmap;
			
			private var current_frame:uint = 0;
			
			private function update_frame():void {
				clip.bitmapData = new BitmapData(FRAME_WIDTH, FRAME_HEIGHT, true, 0);
				clip.bitmapData.copyPixels(source.bitmapData, new Rectangle(current_frame * FRAME_WIDTH, 0, FRAME_WIDTH, FRAME_HEIGHT), new Point(0, 0));
			}
			
			private function next_frame(e:Event):void {
				current_frame = (current_frame + 1) % NUM_FRAMES;
				update_frame();
			}
			
			private function set_timer():void {
				var t1:Timer = new Timer(1000);
				t1.addEventListener(TimerEvent.TIMER, next_frame);
				t1.start();
			}

		
			private function init():void {
				source = new Sheet();
				clip = new Bitmap(new BitmapData(FRAME_WIDTH, FRAME_HEIGHT));
				
				current_frame = 0;
				
				
				update_frame();
				cnv.rawChildren.addChild(clip);
				cnv.invalidateDisplayList(); 
				set_timer(); 
				
				
			}
			
		]]>
	</mx:Script>
	
</mx:Application>