Sierpiński Glitch Texture #2

Actionscript:
  1. [SWF(frameRate=60, backgroundColor=0x000000, width=500, height=500)]
  2. var canvas:BitmapData = new BitmapData(500,500,false, 0x000000);
  3. addChild(new Bitmap(canvas));
  4. var clone:BitmapData = new BitmapData(500,500,false, 0x000000);
  5. var canvasRect:Rectangle = canvas.rect;
  6. var w:int = canvas.width;
  7. var w2:Number = 1/w;
  8. var w10:Number = 1/(w * 80);
  9. var convert:Number = Math.PI/180;
  10. var size:int = canvas.width * canvas.height;
  11. var pix:Vector.<uint> = new Vector.<uint>(size, true);
  12. var gray:ColorMatrixFilter = 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]);
  13. var m:Matrix = new Matrix();
  14. m.scale(1,-1);
  15. m.translate(0,canvas.height);
  16. var sin:Number = 0, cos:Number = 0;
  17. var dx:Number = 0, dy:Number = 0;
  18. var pnt:Point = new Point();
  19. var blur:BlurFilter = new BlurFilter(10,10,1);
  20. addEventListener(Event.ENTER_FRAME, onLoop);
  21. function onLoop(evt:Event):void {
  22.     canvas.lock();
  23.     dx += (mouseX * 10 - 3000 - dx) / 8;
  24.     dy += (mouseY * 4 - dy) / 8;
  25.     for (var i:int = 0; i<size; i++){
  26.         var xp:int = i % w;
  27.         var yp:int = int(i * w2);
  28.         var xp2:int = xp <<1;
  29.         var t:Number;
  30.         t = ((yp|(xp + yp)) * (xp + dx) *w10) % 6.14687;
  31.         //compute sine
  32.         // technique from http://lab.polygonal.de/2007/07/18/fast-and-accurate-sinecosine-approximation/
  33.         // by Michael Baczynski
  34.         if (t<0) {
  35.             sin=1.27323954*t+.405284735*t*t;
  36.         } else {
  37.             sin=1.27323954*t-0.405284735*t*t;
  38.         }
  39.         // compute cosine
  40.         t = (xp2|(yp+xp/dx) + dy) * convert % 6.28;
  41.         t+=1.57079632;
  42.         if (t>3.14159265) {
  43.             t-=6.28318531;
  44.         }
  45.         if (t<0) {
  46.             cos=1.27323954*t+0.405284735*t*t;
  47.         } else {
  48.             cos=1.27323954*t-0.405284735*t*t;
  49.         }
  50.         var c1:int = 31 * (sin - cos);
  51.         if (c1 <0) c1 = 256 - c1;
  52.         c1 = (c1>>1  | c1) ;
  53.         pix[i] = c1 <<17 | c1 <<8 | c1;
  54.     }
  55.     canvas.setVector(canvasRect, pix);
  56.     clone.copyPixels(canvas, canvasRect, pnt);
  57.     canvas.draw(clone, m, null, BlendMode.SUBTRACT);
  58.     clone.copyPixels(canvas, canvasRect, pnt);
  59.     clone.applyFilter(clone, canvasRect, pnt, blur);
  60.    
  61.     canvas.draw(clone, null, null, BlendMode.LIGHTEN);
  62.     canvas.applyFilter(canvas, canvasRect, pnt, gray);
  63.     canvas.unlock();
  64. }

More texture experimentation...

Have a look at the swf over at wonderfl.net...

This entry was posted in BitmapData, Operators, Vector, pixel manipulation and tagged , , . Bookmark the permalink. Post a comment or leave a trackback: Trackback URL.

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