FlashMyMind - Flash and ActionScript 3 Tutorials

//The number of bubbles we will have on the stage
const NUMBER_OF_BUBBLES:uint = 60;
 
//Save the stage width and height
var stageWidth:Number = stage.stageWidth;
var stageHeight:Number = stage.stageHeight;
 
//This array will contain all the bubbles
var bubbles:Array = new Array();
 
//This loop creates and positions the bubbles to random locations
for (var i:uint = 0; i < NUMBER_OF_BUBBLES; i++) {
 
        //Create a new bubble
        var bubble:Bubble = new Bubble();
 
        //Assign a random y coordinate (from 0 to 300)
        bubble.y = Math.random() * stageHeight;
 
        //Calculate the horizontal distance from the mouse cursor to the center of the stage
        var distanceFromCenter:Number = mouseX - stageWidth / 2;
 
        //Calculate the x coordinate (from -400 to 800)
        bubble.x = Math.random()*stageWidth-Math.random()*distanceFromCenter*2;
 
        //Assign a random scale
        bubble.scaleX = bubble.scaleY = Math.random() + 0.3;
 
        //Assign a random alpha
        bubble.alpha = Math.random() + 0.5;
 
        //Assign a random current angle for the bubble
        bubble.currentAngle = Math.random() * Math.PI * 2;
 
        //Assign a random angle speed
        bubble.angleSpeed = Math.random() * 0.1;
 
        //Assign a random radius for the bubble
        bubble.radius = Math.random() * 5;
 
        //Assign a random y speed
        bubble.ySpeed =  -  Math.random() * 0.5;
 
        //Assign a random y acceleration speed
        bubble.acceleration =  -  Math.random() * 0.2;
 
        //Add the bubble to the bubbles array
        bubbles.push(bubble);
 
        //Add the bubble to the stage
        addChild(bubble);
}
 
//Add ENTER_FRAME listener for animating the bubbles
addEventListener(Event.ENTER_FRAME, moveBubbles);
 
//This function is called in each frame
function moveBubbles(e:Event):void {
 
        //Calculate the horizontal distance from the mouse cursor to the center of the stage
        var distanceFromCenter:Number = mouseX - stageWidth / 2;
 
        //Calculate a new x speed for the bubbles
        var xSpeed:Number = distanceFromCenter / 32;
 
        //Loop through the bubbles array
        for (var i:uint = 0; i < bubbles.length; i++) {
 
                //Save the bubble to a local variable
                var bubble:Bubble = (Bubble)(bubbles[i]);
 
                //Update the ySpeed of the bubble (accelerate)
                bubble.ySpeed += bubble.acceleration;
 
                //Update the y coorinate
                bubble.y+=bubble.ySpeed;
 
                //Update the current angle of the bubble
                bubble.currentAngle+=bubble.angleSpeed;
 
                //Update the x coordinate
                bubble.x+=Math.sin(bubble.currentAngle)*bubble.radius+xSpeed;
 
                //Check if the bubble is over the top of the stage
                if (bubble.y<0) {
 
                        //Assign a new random x coordinate
                        bubble.y=stageHeight;
                        bubble.x=Math.random()*stageWidth-Math.random()*distanceFromCenter*2;
 
                        //Assign a new random current angle
                        bubble.currentAngle=Math.random()*Math.PI*2;
 
                        //Assign a new random ySpeed
                        bubble.ySpeed= -Math.random()*0.5;
                }
        }
}