1/f ゆらぎで円運動

円運動の角速度に1/f　ゆらぎを適用。
ずっと円の動きを眼で追っていると眠くなる？？




1/f ゆらぎ参考

package{
    import flash.display.*;
    import flash.events.*;
    import flash.geom.*;
    import flash.utils.*;
    import flash.filters.*;

    [SWF(width="400", height="400",backgroundColor="0x0")]

        public class f22 extends Sprite{
            private var balls:Array = [];
            private var timer:Timer = null;
            private var tick:Number = 0;
            private var rad:Number = 0;
            private var colors:Array = [0xFF0000, 0xFFFF00, 0xFFFFFF];
            private var alphas:Array = [0, 0.5, 1];
            private var ratios:Array = [0, 192, 255];
            private var gradientGlowFilter:GradientGlowFilter = new GradientGlowFilter(0, 0, colors, alphas, ratios, 32, 32, 3, 3, "outer", false);


            private var ball:Ball = new Ball(0xffffff, 30);

            public function f22(){
                ball.alpha = 0.6;
                ball.filters = [gradientGlowFilter];
                addChild(ball);


                timer = new Timer(50);
                timer.addEventListener(TimerEvent.TIMER, cal);
                timer.start();

            }

            private function cal(e:Event) :void{
                var x:Number = Math.PI*2*tick - Math.PI;
                var fx:Number = 0;
                for(var i:Number = 0 ; i < 11 ; i++){
                    fx += Math.pow(2, -i)*Math.sin(Math.pow(2,i)*x);
                }
                fx = (fx+1.5)/3;
                trace(fx);
                rad += fx/10.0;
                ball.alpha = fx;
                ball.x = Math.cos(rad)*150 + 200;
                ball.y = Math.sin(rad)*150 + 200;

                tick += 0.01;
                if(tick > 1)
                    tick =  0;
            }

}

import flash.display.*;

internal class Ball extends Sprite{
    public function Ball(color:int, radius:int){
        graphics.beginFill(color);
        graphics.drawCircle(0,0,radius);
        graphics.endFill();
    }
}