Game Programming (swishmax 4) – Retro Star Field – advanced

onFrame (1) {
// starfield
    i=0; 
    _x=275; 
    _y=200;
     m=Math; onEnterFrame=function(){     
         star=createEmptyMovieClip("star"+i,++i);     
         star.lineStyle(2,0xFFFFFF);     
         star.lineTo(1,0);     
         star._alpha=0;     
         star.d=1;     
         star.r=m.random()*m.PI*2;     
         star.onEnterFrame=function(){  
             StarCol = Math.round( Math.random()*0xFFFFFF );
             StarColoredObject = new Color (star);
             StarColoredObject.setRGB(StarCol);       
             with(this){             
                 d*=1.1;             
                 if(d>300)removeMovieClip();             
                 _alpha=d/2;             
                 _x=m.cos(r)*d;             
                 _y=m.sin(r)*d;         
                 }     
} 
} 
// 
}