ADDED_TO_STAGE Event doesn't work in certain frame? - actionscript-3

Question

This is Heli's Class and it'll called in main class ,the target of main class in frame 2 .
The frame 1 contain button that can make me go to frame 2 .but this movie clip of Heli doesn't added to the stage . but it'll work if i targeting main class in frame 1 . so can anyone tell me how to use added_to_stage event in specified frame ??? (sorry about my english)
package com.ply
{
import flash.display.MovieClip;
import flash.display.Sprite;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.ui.Keyboard;
public class Heli extends MovieClip
{
//Settings
public var xAcceleration:Number = 0;
public var yAcceleration:Number = 0;
private var xSpeed:Number = 0;
private var ySpeed:Number = 0;
private var up:Boolean = false;
private var down:Boolean = false;
private var left:Boolean = false;
private var right:Boolean = false;
private var bullets:Array;
private var missiles:Array;
public function Heli()
{
addEventListener(Event.ADDED_TO_STAGE, onAddedToStage);
}
public function onAddedToStage(event:Event):void
{
removeEventListener(Event.ADDED_TO_STAGE, onAddedToStage);
init();
}
private function init():void
{
stage.addEventListener(Event.ENTER_FRAME, runGame);
}
private function runGame(event:Event):void
{
xSpeed += xAcceleration ; //increase the speed by the acceleration
ySpeed += yAcceleration ; //increase the speed by the acceleration
xSpeed *= 0.95; //apply friction
ySpeed *= 0.95; //so the speed lowers after time
if(Math.abs(xSpeed) < 0.02) //if the speed is really low
{
xSpeed = 0; //set it to 0
//Otherwise I'd go very small but never really 0
}
if(Math.abs(ySpeed) < 0.02) //same for the y speed
{
ySpeed = 0;
}
xSpeed = Math.max(Math.min(xSpeed, 10), -10); //dont let the speed get bigger as 10
ySpeed = Math.max(Math.min(ySpeed, 10), -10); //and dont let it get lower than -10
this.x += xSpeed; //increase the position by the speed
this.y += ySpeed; //idem
}
}
}

Answer 1

public function Heli()
{
if (stage) init();
addEventListener(Event.ADDED_TO_STAGE, onAddedToStage);
}

Answer 2

here it is the main class
package
{
import com.ply.Heli;
import com.peluru.Bullet;
import com.musuh.Airplane2;
import flash.display.Sprite;
import flash.display.Stage;
import flash.display.MovieClip;
import flash.events.KeyboardEvent;
import flash.ui.Keyboard;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.display.*;
import flash.events.*;
import flash.utils.*;
public class Main extends MovieClip
{
public static const STATE_INIT:int = 10;
public static const STATE_START_PLAYER:int = 20;
public static const STATE_PLAY_GAME:int = 30;
public static const STATE_REMOVE_PLAYER:int = 40;
public static const STATE_END_GAME:int = 50;
public var gameState:int = 0;
public var player:Heli;
public var enemy:Airplane2;
//public var bulletholder:MovieClip = new MovieClip();
//================================================
public var cTime:int = 1;
//the time it has to reach in order to be allowed to shoot (in frames)
public var cLimit:int = 10;
//whether or not the user is allowed to shoot
public var shootAllow:Boolean = true;
//how much time before another enemy is made
public var enemyTime:int = 0;
//how much time needed to make an enemy
//it should be more than the shooting rate
//or else killing all of the enemies would
//be impossible :O
public var enemyLimit:int = 64;
//the player's score
public var score:int = 0;
public var gameOver:Boolean = false;
public var bulletContainer:MovieClip = new MovieClip();
//================================================
public function Main()
{
//stage.addEventListener(Event.ENTER_FRAME, gameLoop);
// instantiate car class
gameState = STATE_INIT;
gameLoop();
}
public function gameLoop(): void {
switch(gameState) {
case STATE_INIT :
initGame();
break
case STATE_START_PLAYER:
startPlayer();
break;
case STATE_PLAY_GAME:
playGame();
break;
case STATE_REMOVE_PLAYER:
//removePlayer();
break;
case STATE_END_GAME:
break;
}
}
public function initGame() :void {
//addChild(bulletholder);
addChild(bulletContainer);
gameState = STATE_START_PLAYER;
gameLoop();
stage.addEventListener(KeyboardEvent.KEY_DOWN, myOnPress);
stage.addEventListener(KeyboardEvent.KEY_UP, myOnRelease);
stage.addEventListener(Event.ENTER_FRAME, AddEnemy);
}
public function startPlayer() : void {
player=new Heli();
player.x = stage.stageWidth / 2;
player.y = stage.stageHeight / 2;
// add car to display list
stage.addChild(player);
gameState = STATE_PLAY_GAME;
}
public function playGame():void {
//CheckTime();
gameLoop();
//txtScore.text = 'Score: '+score;
}
public function myOnPress(event:KeyboardEvent):void
{
if(event.keyCode == Keyboard.LEFT)
{
player.xAcceleration = -1;
}
else if(event.keyCode == Keyboard.RIGHT)
{
player.xAcceleration = 1;
}
else if(event.keyCode == Keyboard.UP)
{
player.yAcceleration = -1;
}
else if(event.keyCode == Keyboard.DOWN)
{
player.yAcceleration = 1;
}
else if (event.keyCode == 32 && shootAllow)
{
fireBullet();
}
}
public function fireBullet() {
//making it so the user can't shoot for a bit
shootAllow = false;
//declaring a variable to be a new Bullet
var newBullet:Bullet = new Bullet();
var newBullet2:Bullet = new Bullet();
//changing the bullet's coordinates
newBullet.x = player.x+20; //+ player.width/2 - player.width/2;
newBullet.y = player.y;
newBullet2.x = player.x-20;
newBullet2.y = player.y;
//then we add the bullet to stage
bulletContainer.addChild(newBullet);
bulletContainer.addChild(newBullet2);
}
function AddEnemy(event:Event){
if(enemyTime < enemyLimit){
//if time hasn't reached the limit, then just increment
enemyTime ++;
} else {
//defining a variable which will hold the new enemy
enemy =new Airplane2();
//making the enemy offstage when it is created
enemy.y = -1 * enemy.height;
//making the enemy's x coordinates random
//the "int" function will act the same as Math.floor but a bit faster
enemy.x = Math.floor(Math.random()*(stage.stageWidth - enemy.width));
//then add the enemy to stage
addChild(enemy);
//and reset the enemyTime
enemyTime = 0;
}
if(cTime <= cLimit){
cTime ++;
} else {
//if it has, then allow the user to shoot
shootAllow = true;
//and reset cTime
cTime = 1;
}
}
public function myOnRelease(event:KeyboardEvent):void
{
if(event.keyCode == Keyboard.LEFT || event.keyCode == Keyboard.RIGHT)
{
player.xAcceleration = 0;
}
else if(event.keyCode == Keyboard.UP || event.keyCode == Keyboard.DOWN)
{
player.yAcceleration = 0;
}
}
}
}