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////////////////////////////////////////////////////////////////////////////////
// DisplacementMapFilter + PerlinNoise [BitmapData.applyFilter版]
//
// 置き換えマップ効果 (3)
// http://www.project-nya.jp/modules/weblog/details.php?blog_id=480
// BitmapDataでノイズ生成 (3)
// http://www.project-nya.jp/modules/weblog/details.php?blog_id=481
// [AS3.0] PerlinNoiseクラスに挑戦！
// http://www.project-nya.jp/modules/weblog/details.php?blog_id=1114
//
// 動作を軽くするための方法 (東京てらこ7 @trick7)
// Bitmap.filters を使わず、BitmapData.applyFilter() を用いる
////////////////////////////////////////////////////////////////////////////////

package {

import flash.display.Sprite;
    import flash.display.Shape;
    import flash.display.StageScaleMode;
    import flash.display.StageAlign;
    import flash.display.BitmapData;
    import flash.display.Bitmap;
    import flash.geom.Rectangle;
    import flash.geom.Point;
    import flash.events.Event;
    import flash.filters.DisplacementMapFilter;
    import flash.display.BitmapDataChannel;
    import flash.filters.DisplacementMapFilterMode;

[SWF(backgroundColor="#000000", width="465", height="465", frameRate="30")]

public class Main extends Sprite {
        private var loader:PhotoLoader;
        private var bitmapData:BitmapData;
        private var bitmap:Bitmap;
        private var basePath:String = "http://assets.wonderfl.net/images/related_images/";
        private var filePath:String = "5/56/5650/56506dfb5d1599c626cd2762a095ba6c57f4b29d";
        private var map:DisplacementMapFilter;
        private static var color:uint = BitmapDataChannel.RED;
        private var scale:Number = 10;
        private var noise:PerlinNoise;
        private var speeds:Array;

public function Main() {
            //Wonderfl.capture_delay(1);
            init();
        }

private function init():void {
            graphics.beginFill(0x000000);
            graphics.drawRect(0, 0, 465, 465);
            graphics.endFill();
            var rect:Rectangle = new Rectangle(0, 0, 400, 400);
            var octaves:uint = 2;
            //ノイズ生成
            noise = new PerlinNoise(rect, 32, 32, octaves, false, color);
            speeds = new Array();
            for (var n:uint = 0; n < octaves; n++) {
                var sx:Number = (Math.random() - 0.5)*4;
                var sy:Number = (Math.random() - 0.5)*4;
                speeds.push(new Point(sx, sy));
            }
            map = new DisplacementMapFilter(noise, new Point(), color, color, scale, scale, DisplacementMapFilterMode.CLAMP);
            loader = new PhotoLoader();
            loader.addEventListener(Event.INIT, initialize, false, 0, true);
            loader.load(basePath + filePath, true);
            bitmap = new Bitmap(new BitmapData(400, 400, true, 0x00000000));
            addChild(bitmap);
            bitmap.x = 32;
            bitmap.y = 32;
            var circle:Shape = new Shape();
            addChild(circle);
            circle.graphics.beginFill(0x000000);
            circle.graphics.drawCircle(232, 232, 145);
            circle.graphics.endFill();
        }
        private function initialize(evt:Event):void {
            bitmapData = Bitmap(evt.target.content).bitmapData;
            bitmap.bitmapData = bitmapData.clone();
            addEventListener(Event.ENTER_FRAME, update, false, 0, true);
        }
        private function update(evt:Event):void {
            //ノイズ生成
            noise.update(speeds);
            //フィルタ適用
            //loader.filters = [map];
            bitmap.bitmapData.lock();
            bitmap.bitmapData.applyFilter(bitmapData, bitmapData.rect, new Point(), map);
            bitmap.bitmapData.unlock();
        }

}

//////////////////////////////////////////////////
// PhotoLoaderクラス
//////////////////////////////////////////////////

import flash.display.Sprite;
import flash.display.Loader;
import flash.display.LoaderInfo;
import flash.net.URLRequest;
import flash.events.Event;
import flash.events.IOErrorEvent;
import flash.events.HTTPStatusEvent;
import flash.events.SecurityErrorEvent;
import flash.display.Bitmap;
import flash.system.LoaderContext;

class PhotoLoader extends Sprite {
    private var loader:Loader;
    private var info:LoaderInfo;
    public var content:Bitmap;
    private var smoothing:Boolean;
    public static const IO_ERROR:String = IOErrorEvent.IO_ERROR;
    public static const HTTP_STATUS:String = HTTPStatusEvent.HTTP_STATUS;
    public static const SECURITY_ERROR:String = SecurityErrorEvent.SECURITY_ERROR;
    public static const INIT:String = Event.INIT;
    public static const COMPLETE:String = Event.COMPLETE;

public function PhotoLoader() {
        loader = new Loader();
        info = loader.contentLoaderInfo;
    }

public function load(file:String, s:Boolean = false):void {
        smoothing = s;
        info.addEventListener(IOErrorEvent.IO_ERROR, ioerror, false, 0, true);
        info.addEventListener(HTTPStatusEvent.HTTP_STATUS, httpstatus, false, 0, true);
        info.addEventListener(SecurityErrorEvent.SECURITY_ERROR, securityerror, false, 0, true);
        info.addEventListener(Event.INIT, initialize, false, 0, true);
        info.addEventListener(Event.COMPLETE, complete, false, 0, true);
        try {
            loader.load(new URLRequest(file), new LoaderContext(true));
        } catch (err:Error) {
            trace(err.message);
        }
    }
    public function unload():void {
        loader.unload();
    }
    private function ioerror(evt:IOErrorEvent):void {
        loader.unload();
        dispatchEvent(new Event(PhotoLoader.IO_ERROR));
    }
    private function httpstatus(evt:HTTPStatusEvent):void {
        dispatchEvent(new Event(PhotoLoader.HTTP_STATUS));
    }
    private function securityerror(evt:SecurityErrorEvent):void {
        dispatchEvent(new Event(PhotoLoader.SECURITY_ERROR));
    }
    private function initialize(evt:Event):void {
        content = Bitmap(info.content);
        if (smoothing) content.smoothing = true;
        dispatchEvent(new Event(PhotoLoader.INIT));
    }
    private function complete(evt:Event):void {
        info.removeEventListener(IOErrorEvent.IO_ERROR, ioerror);
        info.removeEventListener(HTTPStatusEvent.HTTP_STATUS, httpstatus);
        info.removeEventListener(SecurityErrorEvent.SECURITY_ERROR, securityerror);
        info.removeEventListener(Event.INIT, initialize);
        info.removeEventListener(Event.COMPLETE, complete);
        addChild(loader);
        dispatchEvent(new Event(PhotoLoader.COMPLETE));
    }

}

//////////////////////////////////////////////////
// PerlinNoiseクラス
//////////////////////////////////////////////////

import flash.display.BitmapData;
import flash.geom.Rectangle;
import flash.geom.Point;

class PerlinNoise extends BitmapData {
    private var bx:uint;
    private var by:uint;
    private var octaves:uint;
    private var seed:uint;
    private var stitch:Boolean = true;
    private var fractalNoise:Boolean = true;
    private var channel:uint = 0;
    private var grayScale:Boolean = true;
    private var offsets:Array = new Array();

public function PerlinNoise(rect:Rectangle, x:uint, y:uint, o:uint = 1, g:Boolean = true, c:uint = 0, s:uint = 1, st:Boolean = false, f:Boolean = true) {
        super(rect.width, rect.height, false, 0xFF000000);
        bx = x;
        by = y;
        octaves = o;
        grayScale = g;
        channel = c;
        if (grayScale) channel = 0;
        for (var n:uint = 0; n < octaves; n++) {
            var point:Point = new Point();
            offsets.push(point);
        }
        stitch = st;
        fractalNoise = f;
        create(s, offsets);
    }

private function create(s:uint, o:Array = null):void {
        seed = s;
        offsets = o;
        if (offsets == null) offsets = [new Point()];
        lock();
        perlinNoise(bx, by, octaves, seed, stitch, fractalNoise, channel, grayScale, offsets);
        draw(this);
        unlock();
    }
    public function update(speeds:Array):void {
        for (var n:uint = 0; n < octaves; n++) {
            var offset:Point = offsets[n];
            var speed:Point = speeds[n];
            offset.x += speed.x;
            offset.y += speed.y;
        }
        lock();
        perlinNoise(bx, by, octaves, seed, stitch, fractalNoise, channel, grayScale, offsets);
        draw(this);
        unlock();
    }

}

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