Tween Class acting up

Im getting some very odd effects with the Tween class,
particularly with alpha tweens. Alpha tweens seem to be freezing up
sometimes, but they won't always. When I put in the tween:
function ani():void{
var holderTween:Tween = new Tween(holder, "alpha",
Strong.easeOut, 0, 1, 20, false);
It would often freeze, and then several of my other Tweens
started to freeze. I thought maybe it was cause I was redeclaring
the tween with the same variable name over and over (in the example
above rerunning ani() before the first tween finished), the old
tweens were being marked for garbage collection as they no longer
had a referrence. Is this possible??? If so is there an easy way
around that? Still doesnt explain why it would effect my other
Tweens though. Is it cause im redeclaring the variable? would
declaring the variable outside the function make a
difference?

yeah, if you want 54% you put .54
I appear to have found a solution the the problem. I could
have used whenMotionFinished, but I dont want to have to wait till
then. If I use an array to keep track of the variouse tweens then I
can stop the old ones before redeclaring new ones. I think I should
be able to just delete them as well, but im just stopping them for
the moment. I guess the garbage collection doesnt happen fast
enouph... or it misses it cause they had the same name. It only
seemed to happen when you repeated the same Tween class very
quickly.

Similar Messages

Tween Class fails

Hi,
i was looking for some help with tween class beacuse i have a strange problem. I'm working with AS3, when i test my project, sometimes the Tween fails, sometimes it works. It's really strange, i don't know why. The animation stops before the end point. The most strange for me is why sometimes it works and sometimes no?
My code is geting a little complex, then i tried to do the same process in a simple model, and the result was the same, i run the model many times, in 5 or 3 % the animation finished before the correct end point. Does anybody with the same problem?
Thanks in advanced!
Henrique.

Thanks clbeech!
In fact, i was using one code line (var nameTween:Tween = new Tween(...)) and calling this line many times by a Timer event. But, how can i use diferent names for the tween var? May i use a counter like var nameTween[counter]:Tween = new Tween(...)?
My code is a little big and confuse, i'll try to solve the problem without publish the code. If i don't find a solution, i'll organize it and them put it here.
Thanks a lot!
H.

Is there a bug in the as3 tween class

Is there a bug in the as3 tween class that causes tweens to stop before completing. I read that there is and that a 3rd party tween class should be used. I'm just starting out learning as3 and experimenting but this would be good to know when I move onto more complex projects.
Also the solution for this was to make your function global. Does this simply mean place your function in the top level of your movie.
I have done research on this topic but I found many conflicting answers.
Any assistance is welcome thanks in advance.

the tween declaration (if you need one) must be placed within the scope of the function. so, if the below function f() is defined in a movieclip, you can use any of the 3 (but don't use the last):
///////// most common use ////////////////////////////////////////
var t:Tween;
function f(){
t=new Tween(...)
/////// next most common use /////////////////////////////////////////
//no declaration needed because the tween is not referenced anywhere outside the function so need not be assigned a variable
function f(){
new Tween(...)
/////////// least common, not good coding, but possible ////////////
// var t:Tween; // declared on the root timeline, for example
function f(){
MovieClip(root).t=new Tween(...)
p.s. please mark correct/helpful answers

Making a complex button with the Tween class...not sure why this isn't working.

Hi all,
I'm trying to make a button which scales up on rollover and
scales down on rollout and I wanted to use the Tween class to do it
because I'm going to be making a bunch of these buttons and I want
the code to be as efficient as possible.
So right now I have a circle in a movie clip, and here's what
I have on the first frame of that circle's actions layer:
import mx.transitions.Tween;
import mx.transitions.easing.*;
function grow(who) {
var tw:Tween = new Tween(who, "_xscale", Strong.easeOut,
100, 400, 1, true);
var tw2:Tween = new Tween(who, "_yscale", Strong.easeOut,
100, 400, 1, true);
function shrink(who) {
var tw3:Tween = new Tween(who, "_xscale", Strong.easeOut,
400, 100, 1, true);
var tw4:Tween = new Tween(who, "_yscale", Strong.easeOut,
400, 100, 1, true);
this.onEnterFrame = function() {
trace(rewind);
if (rewind == true) {
shrink(this);
this.onRollOver = function() {
rewind = false;
grow(this);
this.onRollOut = function() {
rewind = true;
The circle scales up just fine but when I rollout it doesn't
scale back down. I did a trace to see if my tween was being called
and sure enough it was. So I did another trace to see if the
_xscale or _yscale was changing and they both were going down to
around 290 on rollOut although there's no noticeable difference in
the size of the button, it just looks like it's sitting there.
I was also wondering if importing the whole class library
will add very much to my file size?
Also, since I'm going to have a lot of these buttons on the
stage at the same time (these buttons will be like markers all over
a map so there'll probably be around 50+) would it be a bad idea to
have that many onEnterFrame checks running simultaneously? Is that
going to slow the user's CPU way down?

Thanks for the suggestions guys.
I tried your code and got the rollOut to work but the button
blinks rapidly if the user rolls out and then rolls back in
quickly. Here is a link to the swf:
http://www.stationarynotes.com/studioI/buttonTest.swf
It also has to reach a complete stop the first time the
button expands or else it won't run the shrink function on rollOut.
I put all of my code on the first frame of the movie clip's
actions layer so here's what mine looks like:
import mx.transitions.Tween;
import mx.transitions.easing.*;
function grow(who) {
var tw:Tween = new Tween(who, "_xscale", Strong.easeOut,
100, 400, 1, true);
var tw2:Tween = new Tween(who, "_yscale", Strong.easeOut,
100, 400, 1, true);
tw.onMotionFinished=function():Void{
who.onRollOut = function() {
shrink(who);
function shrink(who) {
var tw3:Tween = new Tween(who, "_xscale", Strong.easeOut,
400, 100, 1, true);
var tw4:Tween = new Tween(who, "_yscale", Strong.easeOut,
400, 100, 1, true);
this.onRollOver = function() {
grow(this);

Adobe air 2.6 iPhone animation tween class vs onEnterframe

Hi, Does anyone knows what's better to create alpha or slide animations on iPhone applications, using a tween class like Tweener or use the classic onEnterframe. What's the better choice, who's the better performance . Thanks, Nuno

Use Tween Class,
http://www.greensock.com/tweenlite/

External swf and the tween class

i have an external swf which i import into my main swf using
the loadMovie command. my external swf has some tween class
animations in it. if i run the main movie, the external swf movie
runs fine of course...but the tween classes are not loaded. am i
missing somthing?
here is the code from the external swf file which is applied
to a clickable movie clip of course.
this.onRollOver = function() {
rewind = false;
play();
var squaretween = new mx.transitions.Tween(previewthumb,
"_xscale", mx.transitions.easing.Elastic.easeOut, 0, 1200, .5,
true);
var squaretween = new mx.transitions.Tween(previewthumb,
"_yscale", mx.transitions.easing.Elastic.easeOut, 0, 1200, .5,
true);
squaretween.onMotionFinished = function() {
loadMovie("hotairlarge.swf",
"_root.homecontainer.printworkcontainer");
any help would be great!

try inserting the following to line 1,frame 1 your main swf:

Is it flash bug? Tween Class

I've been working on a bit big project. I've some components on the stage. There are basically 4 frames. Each frame has some components. What I've done is, I've used tween class. Workflow is something like this:
Frame 1:
--used Tween class to get fade effect for List component.
--used Tween.MOTION_FINISH event to fire an event when it is finished.
--when it is finished, applied eventListener
--on Change event, remove eventListeners and use Tween class again to get reverse fade effect.
--again used Tween.MOTION_FINISH event to fire an event when finished.
--in that evenHandler, gotoAndStop(2);
Frame 2:
//similar
Frame 3:
//similar
and so on.. now, what happens, is, if i play with my scene, sometimes tween class failed to work. sometimes it does not display List component, sometimes it displays List component with alpha 0.2. sometimes it happens with movieClip also. Is it flash bug or problem with my code?

probably a coding problem. the most common error that seems like a flash bug would be to define a tween within a function body allowing flash to gc that tween, possibly before it starts and/or completes.

Tween Class - calling Function

What am I doing wrong? I have been using the Tween Class in AS2 for years. This is how I have been using it.
//Beginning of my Flash file
import mx.transitions.Tween;
import mx.transitions.easing.*;
function fadeon(mcname:String) {
    new Tween(mcname, "_alpha", Strong.easeOut, 0, 100, 1.5, true);
//This is placed on Frames where I want to call this particular Tween
fadeon(mymovieclipsname);
Similiar setup for AS3 with no errors when I run it. The only problem is it doens't work.
import fl.transitions.Tween;
import fl.transitions.easing.*;
function fadeon(mcname:String):void {
    new Tween(mcname, "alpha", Strong.easeOut, 0, 100, 1.5, true);
//on Frames where I want to call this particular Tween
mymovieclipsname.fadeon();
if I run this portion the same as AS2 I get this lovely Compiler Error message.
1067: Implicit coercion of a value of type flash.display:MovieClip to an unrelated type String.
Any thoughts or help wold be greatly appreciated.

Note that a better solution for AS3 is to simply create a Class that does the tween (to itself), then apply that to each bullet and leave the parent out of it. I'd probably have done the same thing in AS2 as well, but I learned As1>As3>As2, so my experience is not representative.
Here's the Class that I use to do this (note I didn't use a Tween for this task as they have the danger to go out of memory before the tween is done unless you store a reference to them):
package view.effects {
import flash.display.Sprite;
import flash.events.Event;
//view.effects.SimpleFadeIn
public class SimpleFadeIn extends Sprite {
public function SimpleFadeIn() {
   super();
   addEventListener(Event.ADDED_TO_STAGE, startFade);
protected function startFade(e:Event):void {
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   addEventListener(Event.ENTER_FRAME, doFade);
   addEventListener(Event.REMOVED_FROM_STAGE, cleanUp);
protected function doFade(e:Event):void {
   if (alpha < 1) {
    alpha += .04;
   } else {
    cleanUp(e);
protected function cleanUp(e:Event):void {
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   removeEventListener(Event.REMOVED_FROM_STAGE, cleanUp);
Note that the reason the path to the Class is there in a comment is so team members can copy and paste it into the Base Class for a MC they want to apply this behavior to.

Tween class trouble

I don't use Tween class often, so don't scold me if this is
an obvious question.
When I set up a simple Tween, it works if I assign a specific
object's instance name as the object to tween. But when doing it
inside a for loop, it doesn't work. Yet everything else within the
for loop works. I've tested every variable, and it's the object
name that doesn't work. Here is a simplified version of the code.
Someone please tell me what I've done wrong.

Walter,
> When I set up a simple Tween, it works if I assign a
specific
> object's instance name as the object to tween. But when
> doing it inside a for loop, it doesn't work.
Interesting. Honestly, your code looks fine. I just
copy/pasted,
literally, and it worked as expected.
I did notice one parameter that might cause some confusion.
In this
line:
var letterUp:Tween = new Tween(this, "_x", Bounce.easeOut,
this._x,
this.startX, 2000);
... that last parameter, 2000, means the tween will progress
*very* slowly,
as it will transpire over the duration of 2000 frames. In a
standard 12dps
movie, the full tween would take over 166 seconds. I'm
wondering if you
meant 2000 in terms of milliseconds? For that, you could drop
it to 2, and
add one more parameter, true, to indicate you want the tween
to transpire in
terms of seconds (true), rather than frames.
David Stiller
Adobe Community Expert
Dev blog,
http://www.quip.net/blog/
"Luck is the residue of good design."

Tween class - tweening from curent position

Hi, I've been looking at the tween classes and I was
wondering how I could use it to tween an object that i already
placed on the stage? So using it's current position and tweening to
a new position. Is there a way of doing it by simply using a term
that flash understands (eg _xPosition)?
Cheers
Ray
import mx.transitions.Tween;
import mx.transitions.easing.*;
new Tween(ball_mc, "_x", Elastic.easeOut, 300, 50, 3, true);
new Tween(ball_mc, "_y", Elastic.easeOut, 100, 50, 3,
true);

I think I asked for help a little quick there.
this._x
it looks like that is what I was after.
Ray

Tween Class Unreliable?

1 out of 4 function calls from a MouseEvent results in the
MovieClip getting 'stuck' somewhere in the tween. As if it's not
finishing. Has anyone else experienced this? Or am I using the
Tween class wrong?
addEventListener(MouseEvent.CLICK, tweenStyle)
private function tweenStyle(event:Event):void
var scaleYTween:Tween = new Tween( MovieClip, "scaleY",
Strong.easeOut, 0, 1, .5, true );

Just hit this:
Note: Consider variable scope when using the Tween class. If
a tween is created in a function, it is important that the
variable's scope exists beyond the function itself. If a tween is
stored to a variable of local scope, ActionScript garbage
collection removes the tween as the function completes, which will
likely be before the tween has even begun.
Yeah, after making my Tweens class members, no
problemo!

Tween Class Help

Hi everyone. I'm doing a website and I'm having trouble with
something. I have a movieclip that I want to animate using the
tween class. however, I want thetween to occur once the frame that
the code is on loads. This is a problem because I can't use
onEnterFrame because it will play thetween continuously. I need it
to play oncethe frame loads and only once. I tried using the
movieclip.onLoad function but it's not working for me. What am I
doing wrong? Here is the code that I'm using...

If the code is in an externally loaded Movie you need to
determine when the frame is available and the general way to go is
using the MovieClipLoader class.
If the code is in a already loaded movie then follow
naomind's recommendation

Tween class - yoyo()

Hi
I was wondering what the opposit function is of the yoyo()
funtion.
I now have a animation running from right to left using the
tween class.
Instead of running the animation at the end going
backwardswith the yoyo() funtion (from left to right). I just want
to start it all over again, so that it runs again from right to
left
gr
Tom

you're welcome.

Tween class animations - modifying elasticity

I am fairly new to Flash, and couldn't find the help I needed through a search.
I am using the Tween class to move objects when buttons are clicked. I am using elastic easing as the animation ends, and it looks ok. But am I able to modify the elasticity at all? I like the effect, but it is a little strong and I would like to reduce the bounce at the end.
Can I do this, or by using this method of animation am I losing the fine control that I would have by using the timeline and I just have to suck it up?

Well the easing you provide for the tween is just a reference to a function. So you can search the web and find your own functions. Robert Penner is famous for a large number of really great easing methods. Or you can just muck a bit with the built in functions. I put two small clips on the stage, clip0 and clip1. Then this code:
import fl.transitions.*;
import fl.transitions.easing.*;
var myTween0:Tween=new Tween(clip0,"x",Elastic.easeOut,100,500,2,true);
myTween0.start();
var myTween1:Tween=new Tween(clip1,"x",myEase,100,500,2,true);
myTween1.start();
function myEase(t:Number, b:Number, c:Number, d:Number):Number {
return Elastic.easeOut(t, b, c, d, .5, .9);
The the top one is the default and the lower one is my "modified" version. If you check out the help files for the Elastic classes easeOut method it requires the first four arguments (time, start value, end value of the prop, and duration) as do all tween functions. But the last two a and p are specific to elastic easing. The first is the amplitude of the sine wave and p is the period of the sine wave. I don't know what the units are on either of those, but I'm guessing pixels (or twips) and either seconds or milliseconds. So you could just fiddle with those numbers.
I'm not sure if there is anyway to send those numbers directly through the Tween constructor -- regardless of whether I used the built in functions or made my own.

Tween class in loaded mcs

I can't seem to find anything that says you can't use the
tween class in movie clips that will be loaded into other movie
clips that also use the tween class. Can anyone shed some light on
this subject for me? My tweens are not working in my loaded swfs
but do as stand alones. I do not have any _root references in my
clips.

aniebel wrote:
> I can't seem to find anything that says you can't use
the tween class in movie
> clips that will be loaded into other movie clips that
also use the tween class.
> Can anyone shed some light on this subject for me? My
tweens are not working in
> my loaded swfs but do as stand alones. I do not have any
_root references in my
> clips.
>
>
>
There is no problem with using tweens in nested clips. Check
that you
use either fully qualified calls (e.g. var tween = new
mx.transitions.Tween(...); ) or that you import the classes
you need
inside your clips (e.g. import mx.transitions.Tween;)
James O'Reilly - JOR
www.jamesor.com

Tween Class acting up

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