Tunnel: Iteration

contests
1

This code simulates traveling through a tunnel.

This is a very early work I did (I had known flash for maybe only a month at the time). Since then I have reduced the code from around 50 lines to 25 with a bit more knowledge on actionscript, I’m still an actionscript newbie.

Just posting for some feedback. Thanks.

df = 1.015;
_root.onEnterFrame = function() {
    createIter = function() {
        i = 200;
        x=y=550;
        xi = -2;
        yi = -5;
        var iter = _root.createEmptyMovieClip("iteration", 1);
        with (iter) {
            lineStyle(1, 0xFF0000, 100);
            moveTo(x+50,y+100);
            while(i > 0) {
                lineTo((x/=xi)+50, y+100);
                lineTo(x+50, (y/=yi)+100);
                xi/=df;
                yi/=df;
                lineTo((x*=xi)+50, y+100);
                lineTo(x+50, (y*=yi)+100);
                xi*=df;
                yi*=df;
                i--;
            }
        }
        iteration._x = 150;
        df -= .0001;
    }
    createIter();
    iteration._alpha = (df-1)/.000045;
};