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FORKED
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Sierpiński Glitch #1 forked from: Sierpiński Glitch #1 [diff(1)]

  1. // forked from shapevent's Sierpiński Glitch #1
  2. package {
  4.     import flash.display.*;
  5.     import flash.geom.*;
  6.     import flash.events.*;
  7.         import flash.filters.*;
  10.     [SWF(frameRate=60, backgroundColor=0x000000, width=500, height=500)]
  12.        public class SierpinskiGlitch extends MovieClip {
  13.         private var canvas:BitmapData;
  14.         private var clone:BitmapData;
  15.         private var canvasRect:Rectangle;
  16.         private var w:int;
  17.         private var w2:Number;
  18.         private var w10:Number;
  19.         private var convert:Number;
  20.         private var size:int;
  21.         private var pix:Vector.<uint>;
  22.         private var gray:ColorMatrixFilter;
  23.         private var m:Matrix;
  24.         private var sin:Number;
  25.         private var cos:Number;
  26.         private var dx:Number;
  27.         private var dy:Number;
  28.         private var pnt:Point;
  29.         private var blur:BlurFilter;
  32.                public function SierpinskiGlitch(){
  33.                   // init
  34.             canvas = new BitmapData(500,500,false, 0x000000);
  35.             addChild(new Bitmap(canvas));
  36.             clone = new BitmapData(500,500,false, 0x000000);
  37.             canvasRect = canvas.rect;
  38.             w = canvas.width;
  39.             w2 = 1/w;
  40.             w10 = 1/(w * 80);
  41.             convert = Math.PI/180;
  42.             size = canvas.width * canvas.height;
  43.             pix = new Vector.<uint>(size, true);
  44.             gray = new ColorMatrixFilter([1, 0.55, 0.55, 0,0,0.55, 0.9, 0.55, 0,0,0.55, 0.55, 0.550,0, 0,0,0,1,0]);
  45.             m = new Matrix();
  46.             m.scale(1,-1);
  47.             m.translate(0,canvas.height);
  48.             sin = 0, cos = 0;
  49.             dx = 0, dy = 0;
  50.             pnt = new Point();
  51.             blur = new BlurFilter(10,10,1);
  52.             addEventListener(Event.ENTER_FRAME, onLoop);
  53.             
  55.                }
  56.                // private methods
  58.         private function onLoop(evt:Event):void {
  59.             canvas.lock();
  60.             dx += (mouseX * 10 - 3000 - dx) / 8;
  61.             dy += (mouseY * 4 - dy) / 8;
  62.             for (var i:int = 0; i<size; i++){
  63.                 var xp:int = i % w;
  64.                 var yp:int = int(i * w2);
  65.                 var xp2:int = xp <<1;
  66.                 var t:Number;
  67.                 t = ((yp|xp) * (xp + dx) *w10) % 6.14687;
  68.                 
  69.                 //compute sine
  70.                 // technique from http://lab.polygonal.de/2007/07/18/fast-and-accurate-sinecosine-approximation/
  71.                 // by Michael Baczynski
  72.                 if (t<0) {
  73.                     sin=1.27323954*t+.405284735*t*t;
  74.                 } else {
  75.                     sin=1.27323954*t-0.405284735*t*t;
  76.                 }
  77.                 // compute cosine
  78.                 t = (xp2 + dy) * convert % 6.28;
  79.                 t+=1.57079632;
  80.                 if (t>3.14159265) {
  81.                     t-=6.28318531;
  82.                 }
  83.                 if (t<0) {
  84.                     cos=1.27323954*t+0.405284735*t*t;
  85.                 } else {
  86.                     cos=1.27323954*t-0.405284735*t*t;
  87.                 }
  88.                 var c1:int = 31 * (sin - cos);
  89.                 if (c1 <0) c1 = 256 - c1;
  90.                 c1 = (c1 <<3 | c1) ;
  91.                 pix[i] = c1 <<15 | c1 <<8 | c1;
  92.             }
  93.             canvas.setVector(canvasRect, pix);
  94.             clone.copyPixels(canvas, canvasRect, pnt);
  95.             canvas.draw(clone, m, null, BlendMode.SUBTRACT);
  96.             clone.copyPixels(canvas, canvasRect, pnt);
  97.             clone.applyFilter(clone, canvasRect, pnt, blur);
  98.             canvas.draw(clone, null, null, BlendMode.ADD);
  99.             canvas.unlock();
  100.         }
  101.         
  103.        }
  105. }
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