Criando um jogo de tiro pequeno

//importing tween classes
import fl.transitions.easing.*;
import fl.transitions.Tween;

//hiding the cursor
Mouse.hide();

//creating a new Star instance
var star:Star = new Star();
//creating the timer
var timer:Timer = new Timer(1000);
//we create variables for random X and Y positions
var randomX:Number;
var randomY:Number;
//variable for the alpha tween effect
var tween:Tween;
//we check if a star instance is already added to the stage
var starAdded:Boolean = false;
//we count the points
var points:int = 0;

//adding event handler on mouse move
stage.addEventListener(MouseEvent.MOUSE_MOVE, cursorMoveHandler);
//adding event handler to the timer
timer.addEventListener(TimerEvent.TIMER, timerHandler);
//starting the timer
timer.start();

function cursorMoveHandler(e:Event):void{
 //sight position matches the mouse position
 sight.x = mouseX;
 sight.y = mouseY;
}

function timerHandler(e:TimerEvent):void{
 //first we need to remove the star from the stage if already added
 if(starAdded){
  removeChild(star);
 }

 //positioning the star on a random position
 randomX = Math.random()*500;
 randomY = Math.random()*300;
 star.x = randomX;
 star.y = randomY;
 //adding the star to the stage
 addChild(star);
 //changing our boolean value to true
 starAdded = true;
 //adding a mouse click handler to the star
 star.addEventListener(MouseEvent.CLICK, clickHandler);
 //animating the star's appearance
 tween = new Tween(star, "alpha", Strong.easeOut, 0, 1, 3, true);
}

function clickHandler(e:Event):void{
 //when we click/shoot a star we increment the points
 points ++;
 //showing the result in the text field
 points_txt.text = points.toString();
}