Hummm.... tweening with actionscipt

1

Hey I’ve known about this for a while, but just today I was told it can reduce file size… this caught my eye as my current big project is getting to be a big fla… So how much can the file be reduced? And also, where do I learn this technique? I know some basic action script, if someone would point me in the way of a tutorial I’d be much appreciative.

2

I wouldnt call it tweening,i’d call it .asp movement

onClipEvent (enterFrame) {
_x+=10;
}

onClipEvent (enterFrame) {
_y+=10;
}

onClipEvent (enterFrame) {
_width+=10;
}

onClipEvent (enterFrame) {
_height+=10;
}

onClipEvent (enterFrame) {
_alpha-=10;
}

onClipEvent (enterFrame) {
_rotation+=10;
}

onClipEvent (enterFrame) {
_xscale+=10;
}

onClipEvent (enterFrame) {
_yscale+=10;
}

put each of these actions in seperate MC’s and watch the fun.asp movement

3

Ah yes, I see how that works… then to stop it I could create a loop that ends after however many frames I need… the only problem is that you don’t know where it ends up at… that leads to a lot of trial and error and testing.

At least I think so…

hmmm how much will that really reduce filesize?

4

no trial an error… or at least not much

something like this could help.

onClipEvent(enterFrame){
If(_x<200){
_x++;
}
}

Mind you this is not optimal. There are better ways of doing this… but not many so simple.

Mostly a/s is used to move things in regular patterns, rather than from point a to b.

It will reduce your file size a lot.

5

d’oh… sounds like I need to incorporate some…

But I shouldn’t be too worried… My file cannot be over 5MB… it’s currently 1MB published with all sound and I’m about half done.

Man I wish I had optimaze!

6

You can create a tweenTo function or prototype to do the job for you. Something I did based on Supra’s code:

MovieClip.prototype.tweenTo=function(x,y,speed){
   var deltax=x-this._x;
   var deltay=y-this._y;
   var distance=Math.sqrt(deltax*deltax+deltay*deltay);
   var norm=speed/distance;
   var diffx=deltax*norm;
   var diffy=deltay*norm;
   if (distance>speed){
      this._x+=diffx;
      this._y+=diffy;
   } else {
      this._x=x;
      this._y=y;
   }
}

You can use that with any movie clip:

onClipEvent(enterFrame){
   this.tweenTo(300,400);
}

pom :asian: