actionscript _alpha effect

[jonsaul]

I was just wondering if anyone could explain how to add a fade up or in effect to _alpha (ie. when the _alpha code is run instead of going straight from "_alpha = 0;" to "_alpha = 100;" there is some kind of fade in/out effect, like with a tween)

I am using a very simple _alpha value in a button to show and hide Movieclips on the stage.(but at the moment it goes from invisible to visible with no in-between)


please let me know if you can help.

Thanx for any posts!!!

JonSaul

[tobyw_1969]

You would need to use a repeating function, like an onEnterFrame, or a setInterval, so that you can adjust the _alpha value incrementally.

myClip_mc.fade = function(step:Number){
this.fadeStep = step;
this.onEnterFrame = function(){
this._alpha += this.step;
if(this._alpha>100 || this.alpha<0){
delete this.onEnterFrame;
delete this.fadeStep;
}
}
}

myClip_mc.fade(-5);


You could also define one function to control any clip you want to fade in and out, like this


function fadeClip(clip_mc:MovieClip, step:Number){
//create an empty mc to avoid conflicting with any existing onEnterFrame
var depth = clip_mc.getNextHighestDepth();
var fader_mc = clip_mc.createEmptyMovieClip("faderClip",depth);
fader_mc.step = step;
fader_mc.onEnterFrame = function(){
this._parent._alpha += step;
if(this._parent._alpha>100 || this._parent._alpha<0){
this.removeMovieClip();
}
}
}

fadeClip(myClip_mc,-5);

[devilmaycry]

import mx.transitions.Tween;
function fadein(who:MovieClip,easeType:Function,Time:Number ){
who._alpha=0;
TweenID = new Tween(who, "_alpha", easeType, who._alpha, 100, Time, true);
}

use:

fadein(_root,mx.transitions.easing.Regular.easeOut ,1);