1

I'm trying to create a function (called by a mouseover event) which will play the movie backwards while the mouse is over the instance, and stop while it's not.

This is what I have so far:

var b2:rightButton = new rightButton(); //new instance
b2.X = 550; //instances position
addChild(b2); //add instance to stage
b2.alpha = .4; // set instances alpha
var num = 0; // new variable called 'num'
b2.addEventListener(MouseEvent.ROLL_OVER, rightScroll); //mouse event for roll over 

function rightScroll(event:MouseEvent) { //the function
    num = 1; //set num to 1
    b2.alpha = .8; //set alpha to 80%
}

b2.addEventListener(MouseEvent.ROLL_OUT, no_rightScroll); //event for roll out

function no_rightScroll(event:MouseEvent){ //roll- out function
    num = 0; //set num back to 0
    b2.alpha = .4; //set alpha back to 40%
}

while (num == 1){ // while num =1 (while mouse is over)
    prevFrame(); //goto previous frame
}

Does anyone knows how to fix that, or a better way to do this?

Improve this question
2
  • Is this encapsulated in a class, or is it a frame script? If it's a framescript, you're probably running into serious scope issues. Commented Nov 15, 2011 at 14:42
  • I don't see any scope issues here, but using any kind of loop for animation is a bad idea. Commented Nov 15, 2011 at 14:50

2 Answers 2

Reset to default
4

The problem with your code at the moment is that loops do not execute in line with the framerate of your movie, so your code will call prevFrame() many, many times in a single frame. This can result in endless loops, which will cause your program to crash, and is completely useless in terms of animation.

The best approach is to listen to the ENTER_FRAME event of your movie, and move the playhead back one frame each time the event is dispatched. By adding and removing the listener in your button actions, you will get the effect you're looking for:

var b2:rightButton = new rightButton(); //new instance
b2.X = 550; //instances position
addChild(b2); //add instance to stage
b2.alpha = .4; // set instances alpha

b2.addEventListener(MouseEvent.ROLL_OVER, rightScroll); //mouse event for roll over 
function rightScroll(event:MouseEvent):void { //the function
    stage.addEventListener(Event.ENTER_FRAME,moveBackwards); //add stage listener
    b2.alpha = .8; //set alpha to 80%
}

b2.addEventListener(MouseEvent.ROLL_OUT, no_rightScroll); //event for roll out
function no_rightScroll(event:MouseEvent):void { //roll- out function
    stage.removeEventListener(Event.ENTER_FRAME,moveBackwards); //remove stage listener
    b2.alpha = .4; //set alpha back to 40%
}

function moveBackwards(evt:Event):void {
    prevFrame();
}
Improve this answer
Sign up to request clarification or add additional context in comments.

4 Comments

can you please post the full syntax for that? Thnks for answering anyway:D
What do you mean by full syntax? I'm on my phone currently so can't easily edit the code, but if you tell me what you need I'll update the answer later.
just the full code for that (like how to add the frame enter event) if you could. please.
I've updated the answer to use the code from your question. The ENTER_FRAME listener is added and removed in the mouse event handler.
2

You'd probably find it much easier to write and read if you use the Greensock TweenLite library. Tweenlite can tween frames just as easily as other numeric values.

Inside your event listener, try adding this:

TweenLite.to( targetMC, 1, { frame:1, ease:fl.transitions.easing.None.easeNone } );

It will tween your movieclip (targetMC in this example) to frame 1 linearly with a duration of 1 second. You can play around with it using any of the other Tweenlite parameters as well.

Improve this answer

Comments

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.