alpha tween in actionscript

[Vikana]

Hi

I am trying to create an alpha tween in actionscript

I have created the mc and asked it to go through a loop adding to the alpha at every increment.

I manage to get it to go through the loop, but it is not changing the alpha value.

_root.createEmptyMovieClip( "tween", 1 );

with ( _root.tween )

{

lineStyle( 20, 0xff00ff, 10 );

moveTo( 0, 0 );

lineTo( 100,0);

}

fadeUp = function(){

temp = false

while(temp != true){

for(i>=0; i<100; i++){

trace("has this gone through loop");

_root.tween._alpha++;

}

temp = true;

}

}

fadeUp();

Once I get the fadeup working, I will then create another loop for the fadeDown.

Any ideas on what I am doing wrong

Cheers

Vikana :cool:

[Xeef]

O = _root.createEmptyMovieClip("tween", 1);
with (_root.tween) {
//i change the Alpha of the line it will also work whit a lover one
//BUT expect NOT that this line will by SOLID when you set the alpha of the movie clip to 100
//if you set the Alpha of the MC to 100 the alpha of this line will by to what ever you set it
//let's say "20"
//so woud you set the alpha of the MC to 50
//the resulting alpha of the LINE woud by 10 !!!!
//i dont think you can set (change) the alpha of a line afterwards
lineStyle(20, 0xff00ff, 100);
moveTo(0, 0);
lineTo(100, 0);
}
O._alpha = 0;
fadeUp = function () {
_root.tween._alpha++;
if (_root.tween._alpha>=100) {
trace("INTERVAL CLEARED")
clearInterval(IntVal);
}
};
//setInterval is returning a number it's countinous counted up ward (warning BAD english)
//so IntVal will have the ID "1" next line woud you execute a setinterval somewhere else
//it's return woud by 2 then next time 3 and so on ...
//whit this ID you can stop the interval
//setinterval is executing the function after each "100" milliseconds (in this case coud by any number)
IntVal = setInterval(fadeUp, 100);
//as you had it
//the hole loop is executed on ONE frame so you woudnt see any tween at all because
//frames are redrawen each frame
//but the hole loop is just ONE frame
//other option is to use onEnterFrame
//BY CAREFULY WGIT BOTH TO STOP THEM AFTER YOU NOT NEED THEM
//outher it will cause performace problems
//AND it will by a nightmare to find the problem

[mdeligt]

}onClipEvent(enterFrame){
if(this._alpha < 100) this._alpha += 1;
}

[Taff]

Once I get the fadeup working, I will then create another loop for the fadeDown.

This line got me thinking....Why? Lots of us do it, but with a little (and it doesnt get much less) Math we can avoid having a fadeOut and a fadeIn function . This is it, I chose to do without and if statements, because that is something I try to do at the moment.


function changeAlpha (target, speed) {
target.onEnterFrame = function () {
return ((target._alpha <= 100) && (target._alpha >= 0)) ? target._alpha += speed : assign (target);
};
function assign (target) {
target.onEnterFrame = null;
return (target._alpha < 0) ? target._alpha = 0 : target._alpha = 100;
}
}

//USAGE

//set a speed we want to use to fade in
speed = 10;

_root.orange.onRelease = function () {
//invert the speed for example from 10 to -10
//thus making our button toggle on or off
speed = -speed;
changeAlpha (this, speed);
};


Any ideas on how to reduce it some more?

Taff

[Vikana]

I would like to thank you guys for the quick response.

I shall come here more often

Respect

Vikana :cool:

[Vikana]

hi guys

came up with another solution (managed to get some time to play with it)




_root.attachMovie("ballMc","ballMc",0,{_x:100, _y:100});

ballMc._alpha =0;


fadeUpProc = function(){
temp = false;

if(temp != true){
fadeUp = function(){
if(ballMc._alpha<=100){
ballMc._alpha++;
updateAfterEvent();
}else{
clearInterval(upInterval);
fadeDownProc();
temp = true;
}

}
upInterval = setInterval(fadeUp,1);

}
}

fadeDownProc = function(){
temp = false;

if(temp != true){
fadeDown = function(){
if(ballMc._alpha>=0){

ballMc._alpha--;
updateAfterEvent();
}else{
clearInterval(downInterval);
fadeUpProc();
temp = true;
}

}
downInterval = setInterval(fadeDown,1);

}
}


fadeUpProc();

cheers for the help

Vikana :cool:

[senocular]

[useastags]
.

[Vikana]

Thanks for the tip

Adjusted code as requested

Vikana :cool: