Fading bitmapData trail problem

programming flash
1

Hello,

I trying to create a fade to transparent trail/follower and I’m doing this using ColorTransform.
The problem is that it simply sets the alpha value of the bitmap to 0.7 al the time, it doesn’t fade at all.


import caurina.transitions.*;

var bmd:BitmapData = new BitmapData(550, 400, true, 0x00000000);
var bm:Bitmap = new Bitmap(bmd);
addChild(bm);

var bf:BlurFilter = new BlurFilter(5, 5, 3);
var cTransform:ColorTransform = new ColorTransform(1,1,1,0.7,0,0,0,0);

var ai:MovieClip = new MovieClip();
ai.graphics.beginFill(0xFF794B);
ai.graphics.drawCircle(50, 50, 30);
ai.graphics.endFill();
addChild(ai);

function mover():void
{
    Tweener.addTween(ai, {x:Math.random()*550,
                            y:Math.random()*400-100,
                            time:1,
                            onComplete:mover});
}

mover();

addEventListener(Event.ENTER_FRAME, loop);

function loop(e:Event):void
{
    bmd.draw(this);
    //bmd.applyFilter(bmd, bmd.rect, new Point(0,0), bf);
    bmd.colorTransform(bmd.rect,cTransform);
}

How can I make it so it fades to nothing after a while?

Harm