forked from: forked from: Sierpiński Glitch #1
/**
* Copyright .156789 ( http://wonderfl.net/user/.156789 )
* MIT License ( http://www.opensource.org/licenses/mit-license.php )
* Downloaded from: http://wonderfl.net/c/zpq8
*/
// forked from miketucker's forked from: Sierpiński Glitch #1
// forked from shapevent's Sierpiński Glitch #1
package {
import flash.display.*;
import flash.geom.*;
import flash.events.*;
import flash.filters.*;
[SWF(frameRate=60, backgroundColor=0x000000, width=500, height=500)]
public class SierpinskiGlitch extends MovieClip {
private var canvas:BitmapData;
private var clone:BitmapData;
private var canvasRect:Rectangle;
private var w:int;
private var w2:Number;
private var w10:Number;
private var convert:Number;
private var size:int;
private var pix:Vector.<uint>;
private var gray:ColorMatrixFilter;
private var m:Matrix;
private var sin:Number;
private var cos:Number;
private var dx:Number;
private var dy:Number;
private var pnt:Point;
private var blur:BlurFilter;
public function SierpinskiGlitch(){
// init
canvas = new BitmapData(500,500,false, 0x000000);
addChild(new Bitmap(canvas));
clone = new BitmapData(500,500,false, 0x000000);
canvasRect = canvas.rect;
w = canvas.width;
w2 = 1/w;
w10 = 1/(w * 80);
convert = Math.PI/180;
size = canvas.width * canvas.height;
pix = new Vector.<uint>(size, true);
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]);
m = new Matrix();
m.scale(1,-1);
m.translate(0,canvas.height);
sin = 0, cos = 0;
dx = 0, dy = 0;
pnt = new Point();
blur = new BlurFilter(10,10,1);
addEventListener(Event.ENTER_FRAME, onLoop);
}
// private methods
private function onLoop(evt:Event):void {
canvas.lock();
dx += (mouseX * 10 - 3000 - dx) / 8;
dy += (mouseY * 4 - dy) / 8;
for (var i:int = 0; i<size; i++){
var xp:int = i % w;
var yp:int = int(i * w2);
var xp2:int = xp <<1;
var t:Number;
t = ((yp|xp) * (xp + dx) *w10) % 6.14687;
//compute sine
// technique from http://lab.polygonal.de/2007/07/18/fast-and-accurate-sinecosine-approximation/
// by Michael Baczynski
if (t<0) {
sin=1.27323954*t+.405284735*t*t;
} else {
sin=1.27323954*t-0.405284735*t*t;
}
// compute cosine
t = (xp2 + dy) * convert % 6.28;
t+=1.57079632;
if (t>3.14159265) {
t-=6.28318531;
}
if (t<0) {
cos=1.27323954*t+0.405284735*t*t;
} else {
cos=1.27323954*t-0.405284735*t*t;
}
var c1:int = 31 * (sin - cos);
if (c1 <0) c1 = 256 - c1;
c1 = (c1 <<3 | c1) ;
pix[i] = c1 <<15 | c1 <<8 | c1;
}
canvas.setVector(canvasRect, pix);
clone.copyPixels(canvas, canvasRect, pnt);
canvas.draw(clone, m, null, BlendMode.SUBTRACT);
clone.copyPixels(canvas, canvasRect, pnt);
clone.applyFilter(clone, canvasRect, pnt, blur);
canvas.draw(clone, null, null, BlendMode.ADD);
canvas.unlock();
}
}
}