# Basic anim slightly jerky

**URL:** <https://forum.kirupa.com/t/basic-anim-slightly-jerky/85567>\
**Category:** Uncategorized\
**Created:** [April 5, 2005, 7:05pm UTC](https://forum.kirupa.com/t/basic-anim-slightly-jerky/85567 "2005-04-05T19:05:39Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![intrinsik](https://avatars.discourse-cdn.com/v4/letter/i/e36b37/32.png) [@intrinsik](https://forum.kirupa.com/u/intrinsik)\
**Post date:** [April 5, 2005, 7:05pm UTC](https://forum.kirupa.com/t/basic-anim-slightly-jerky/85567/1 "2005-04-05T19:05:39Z")

</div>

Stick this in a frame on a new document at 30fps:

```php
MovieClip.prototype.scaleIt=function(me){
if (me._xscale < 300) {
	 me._xscale = me._yscale += 1;
	}else{
	 me.clearInterval(this.intrvl);
}
};
MovieClip.prototype.startScale=function(){
this.intrvl=setInterval(this.scaleIt,5,this);
 
};
this.createEmptyMovieClip('box',1);
box.beginFill(0xe000000,100);
box.moveTo(50,50);
box.lineTo(50,100);
box.lineTo(100,100);
box.lineTo(100,50);
box.lineTo(50,50);
box.endFill();
box.startScale();

```

Could somebody explain to me why it is jerky? I just dont understand why the anim is all jittery…esp on the left/right side (top/bottom seem fine)… Moving it faster makes it worse as well.

Many Thanks