/**
 * マウスドラッグでもっと渦巻き
 */
package {
	
	import com.flashdynamix.utils.SWFProfiler;
	import flash.display.Bitmap;
	import flash.display.BitmapData;
	import flash.display.BitmapDataChannel;
	import flash.display.Loader;
	import flash.display.Sprite;
	import flash.display.StageAlign;
	import flash.display.StageScaleMode;
	import flash.events.Event;
	import flash.events.MouseEvent;
	import flash.filters.BitmapFilter;
	import flash.filters.DisplacementMapFilter;
	import flash.filters.DisplacementMapFilterMode;
	import flash.geom.Matrix;
	import flash.geom.Point;
	import flash.net.URLRequest;
	import flash.system.LoaderContext;
	
	[SWF(backgroundColor="0xFFFFFF", width="465", height="465", frameRate="60")]
	public class Main7 extends Sprite {
		
		private static const WIDTH_STAGE:uint = 465;
		private static const HEIGHT_STAGE:uint = 465;
		
		public function Main7() {
			if (stage) init();
			else addEventListener(Event.ADDED_TO_STAGE, init);
		}
		
		private var _jpeg:Bitmap;
		private var _canvas:Sprite = new Sprite();
		private var _nowDmfsValue:uint = 0;
		private var _mapBitmaps:Vector.<BitmapData> =  new Vector.<BitmapData>();
		private var _mapBitmapNo:uint = 0;
		private var _radius:Number = 100;
		private var _dmf:DisplacementMapFilter;
		private var _maxDistance:Number;
		
		private function init(e:Event = null):void {
    
			removeEventListener(Event.ADDED_TO_STAGE, init);
			stage.align = StageAlign.TOP_LEFT;
			stage.scaleMode = StageScaleMode.NO_SCALE;    		

			SWFProfiler.init(this);
                        Wonderfl.capture_delay( 3 );	
			var context:LoaderContext = new LoaderContext();
			context.checkPolicyFile = true;
			
			var loader:Loader = new Loader();
			loader.load(new URLRequest("http://miniapp.org/wonderfl/image/beck.jpg"), context);
			loader.contentLoaderInfo.addEventListener(Event.COMPLETE, function():void { 
				_jpeg = Bitmap(loader.content);
				loader.contentLoaderInfo.removeEventListener(this, arguments.callee);
				start();
			});
		}
		
		private function start():void { 
			_canvas.addChild(_jpeg);
			_canvas.x = (WIDTH_STAGE - _canvas.width) / 2;
			_canvas.y = (HEIGHT_STAGE - _canvas.height) / 2;
			addChild(_canvas);
			
			_maxDistance = _radius * 1.2;//適当 適宜調整
			_dmf = new DisplacementMapFilter(
				null,
				new Point(),
				BitmapDataChannel.BLUE,//x方向の移動に使う色
				BitmapDataChannel.GREEN,//y方向の移動に使う色
				_maxDistance * 2,
				_maxDistance * 2,
				DisplacementMapFilterMode.COLOR
			);
			
			_mapBitmaps.push(createMapBitmap(180));
			_mapBitmaps.push(createMapBitmap(360));
			
			stage.addEventListener(MouseEvent.MOUSE_UP, mouseUpHandler);
			stage.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
			addEventListener(Event.ENTER_FRAME, enterFrameHandler);
		}
		
		private function createMapBitmap(maxRaddian:Number):BitmapData {
			var mapBitmap:BitmapData = new BitmapData(_radius * 2, _radius * 2, false);
			
			var yMax:int = _radius * 2;
			var xMax:int = _radius * 2;
			var center:Number = _radius;
			
			var maxRaddian:Number = (Math.PI / 180) * maxRaddian;
			
			var m:Matrix = new Matrix();
			var p:Point = new Point();
			
			mapBitmap.lock();
			for (var xx:Number = 0; xx < xMax; ++xx) {
				for (var yy:Number = 0; yy < yMax; ++yy) {
					var dx:Number = xx - center;
					var dy:Number = yy - center;
					var distance:Number = Math.sqrt(dx * dx + dy * dy);
					
					if(distance < _radius){
						var powerRate:Number = 1 - (distance / _radius);
						//円の真ん中を中心として、回転させる行列をつくる。
						//円の中心に行くにしたがって回転が強くなるようにする。
						m.identity();
						m.translate(-center, -center);
						m.rotate(maxRaddian * powerRate);
						m.translate(center, center);
						
						//現在の(xx, yy)の地点が移動先と考える。
						//移動前の座標を求めるので、逆行列を求める
						m.invert();
						
						p.x = xx;
						p.y = yy;
						
						var applyPoint:Point = m.transformPoint(p);
						var rateX:Number = (applyPoint.x - xx) / _maxDistance;
						var rateY:Number = (applyPoint.y - yy) / _maxDistance;
						
						var colorX:Number = Math.round(rateX * 0x7F) + 0x80;
						var colorY:Number = Math.round(rateY * 0x7F) + 0x80;
						
						var color:uint = colorY << 8 | colorX;
					}
					else {
						color = 0x808080;
					}
					mapBitmap.setPixel(xx, yy, color);
				}
			}
			
			mapBitmap.unlock();
			return mapBitmap;
		}
		
		private function mouseDownHandler(e:MouseEvent):void {
			_mapBitmapNo = 1;
		}
		
		private function mouseUpHandler(e:MouseEvent):void {
			_mapBitmapNo = 0;
		}
		
		//マウス中心に動かす
		private function enterFrameHandler(e:Event):void {
			_dmf.mapBitmap = _mapBitmaps[_mapBitmapNo];
			
			var p:Point = _dmf.mapPoint;
			p.x = _canvas.mouseX - _radius;
			p.y = _canvas.mouseY - _radius;
			_dmf.mapPoint = p;
			
			_jpeg.filters = [_dmf];
		}
	}
}