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ActionScript

package {
    import flash.display.*;
    import flash.events.*;
    
    public class FlashTest extends Sprite {
        public function FlashTest() {
            // write as3 code here..
            
          
var a:Number = 0.02;
var b:Number = .9998;
 
var xn1:Number = 5;
var yn1:Number = 0;
var xn:Number, yn:Number;
 
var scale:Number = 10;
var iterations:Number = 20000;
 
function f(x:Number):Number{
    var x2:Number = x * x;
    return a * x + (2 * (1 - a) * x2) / (1 + x2);
}
 
var canvas:BitmapData = Bitmap(addChild(new Bitmap(new BitmapData(600,600,false,0xEFEFEF)))).bitmapData;
                                                                       
addEventListener(Event.ENTER_FRAME, onLoop);
function onLoop(evt:Event):void {
   
    canvas.fillRect(canvas.rect, 0xEFEFEF);
    a = mouseY / 1000;
    xn1 = mouseX / 30;
    yn1 = 0;
    for (var i:int = 0; i<iterations; i++){
          xn = xn1;
          yn = yn1;
         
          xn1 = b * yn + f(xn);
          yn1 =  -xn + f(xn1);
          canvas.setPixel( 230 + xn1 * scale, 250 + yn1 * scale, 0x000000);
    }
}

}
    }
}

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