MilkyWay (perlinNoise)

by yd_niku 06 Jul 2010

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/**
 * Copyright yd_niku ( http://wonderfl.net/user/yd_niku )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/gVN8
 */

package {
    import flash.events.*;
    import flash.geom.*;
    import flash.display.*;
    import flash.filters.*;
    [SWF(backgroundColor=0x000000)]
    public class FlashTest extends Sprite {
        private var _seed:Number;
        
        private var _twinkles:BitmapData;
        private var _noise:BitmapData;
        private var _milkyway:BitmapData;
        
        private var _canvas:BitmapData;
        
        private var _blur :BlurFilter
        
        public function FlashTest() {
            // write as3 code here..
            _milkyway = new BitmapData(465,465,true,0x00);
            
            _canvas = _milkyway.clone();
            addChild( new Bitmap(_canvas) );
            
            _noise = _canvas.clone();
            _noise.noise(Math.random(),0,255,1,true);
            
            _twinkles = new BitmapData(465>>1,465>>1,false,0x00);
            var tw:Bitmap = new Bitmap(_twinkles);
            tw.smoothing = true;
            tw.scaleX = tw.scaleY= 2;
            addChildAt(tw,0 );
            
            _offset = new Point();
            _seed = Math.random();
            
            _blur = new BlurFilter(8,8,3);
            
            addEventListener(Event.ENTER_FRAME,update);
        }
        private var _orgPoint:Point = new Point();
        private var _offset:Point;
        private var _ctf:ColorTransform = new ColorTransform(0.95,0.95,0.98,0.97); 
        private function update(e:Event):void{
            _offset.x += -(mouseX/465-0.5)*5;
            _offset.y += -(mouseY/465-0.5)*5;
            //_canvas.fillRect(_canvas.rect,0x00);
            _milkyway.perlinNoise(128,256,2,_seed,true,true,1, true, [ _offset ]);
            
            _milkyway.draw(_noise,null,null,BlendMode.OVERLAY);
            _milkyway.threshold(_milkyway,_milkyway.rect,_orgPoint,"<",0xFFE50000,0x00000000,0xFFFFFFFF,false);
            
            _canvas.applyFilter(_canvas,_canvas.rect,_orgPoint,_blur );
            _canvas.draw(_milkyway);
            _canvas.colorTransform(_canvas.rect,_ctf);
            
            //_twinkles.fillRect(_twinkles.rect,0x00);
            //_twinkles.draw(_milkyway, new Matrix(0.5,0,0,0.5)); 
        }

    }
}