//This array will contain all the numbers seen on stage
var numbers:Array = new Array();
 
//We want 8 rows
for (var i=0; i < 8; i++) {
 
        //We want 21 columns
        for (var j=0; j < 21; j++) {
 
                //Create a new BitNumber
                var myNumber:BitNumber = new BitNumber();
 
                //Assign a starting position
                myNumber.x = myNumber.width * j;
                myNumber.y = myNumber.height * i;
 
                //Give it a random speed (2-7 pixels per frame)
                myNumber.speedY = Math.random() * 5 + 2;
 
                //Add the number to the stage
                addChild (myNumber);
 
                //Add the number to the array
                numbers.push (myNumber);
 
        }
}
 
//Add ENTER_FRAME so we can animate the numbers (move them down)
addEventListener (Event.ENTER_FRAME, enterFrameHandler);
 
/* This function is repsonsible for moving the numbers down the stage. The alpha animation is done inside of the myNumberMC movieclip. */
function enterFrameHandler (e:Event):void {
 
        //Loop through the numbers
        for (var i = 0; i < numbers.length; i++) {
 
                //Update the y position
                numbers[i].y += numbers[i].speedY;
 
                //If the BitNumber is below the stage, move it up again
                if (numbers[i].y > stage.stageHeight) {
                        numbers[i].y = 0;
                }
        }
}

//This variable tells us should we increase the alpha
var increaseAlpha:Boolean;
 
//We want the number to be invisible at the beginning
numberInside.alpha = 0;
 
//Calculate a random timer delay (how often we increase the alpha)
var timerDelay:Number = Math.random() * 4000 + 2000;
 
//Create and start a timer
var timer:Timer = new Timer(timerDelay, 0);
timer.addEventListener (TimerEvent.TIMER, timerHandler);
timer.start ();
 
//Add ENTER_FRAME so we can animate the alpha change
addEventListener (Event.ENTER_FRAME, enterFrameHandler);
 
/* Timer calls this function. Timer delay defines how often this is called. */
function timerHandler (e:Event):void {
 
        //Update the increaseAlpha value
        increaseAlpha = true;
 
        //Calculate a random number (0 or 1)
        var newNumber:int = Math.floor(Math.random() * 2);
 
        //If the random number is 1, we insert "1" into the text box
        if (newNumber == 1) {
                numberInside.myText.text = "1";
        }
        //Else we insert "0" into the text box
        else {
                numberInside.myText.text = "0";
        }
}
 
//This function animates the alpha
function enterFrameHandler (e:Event):void {
 
        //Increase the alpha if increaseAlpha is true
        if (increaseAlpha == true) {
                numberInside.alpha += 0.02;
        }
 
        //Else we want to decrease the alpha
        else {
                numberInside.alpha -= 0.02;
        }
 
        //We don't want the alpha to be over one, so we assign increaseAlpha to be false
        if (numberInside.alpha > 1) {
                increaseAlpha = false;
        }
        //If the alpha is negative, set it to zero
        if(numberInside.alpha < 0) {
                numberInside.alpha = 0;
        }
}