使用addChild - Flash？

Question

所以我搞砸了，並決定我將添加一個主菜單，我已經在Flash中工作的遊戲。所以我得到了我的背景，並且我已經決定要在背景中添加一個球，它會在屏幕上上下跳動 - 但是到目前爲止，我發現的僅僅是粘在頂角，並沒有更新每一幀。有些反饋意見是我錯誤的地方非常感謝 - 我知道它可能是因爲我在錯誤的地方做着addChild(gameBall)，但我該如何糾正？ main.as基本上是檢查遊戲所處狀態的開關，mainMenu.as是mainMenu本身。他們是我在代碼上面評論過的單獨文件。

// main.as 
package 
{ 
import flash.display.*; 
import flash.system.fscommand; 

public class main extends MovieClip 
{ 
    public function main() 
    { 
     changeState(null, "menu"); 
    } 
    public function changeState (currentState, nextState) 
    { 
     if (currentState != null) 
     { 
      removeChild(currentState); 
     } 
     switch(nextState) 
     { 
      case "menu": var mm:mainMenu = new mainMenu(changeState); 
         addChild(mm); 
      break; 
      case "game": var g:theGame = new theGame(changeState); 
         addChild(g); 
      break; 
      case "exit": fscommand("quit"); 
      break; 
     } 
    } 

} 

} 



//mainMenu.AS 
package 
{ 
import flash.display.*; 
import flash.events.*; 

public class mainMenu extends MovieClip 
{ 
    var theCallBackFunction:Function; 

    private var ballX:Number = 5; // Declaring a variable known as _vx 
    private var ballY:Number = 5; // Declaring a variable knwon as _vy 
    private const GRAVITY:Number = 2; // Declaring a const variable known as gravity 
    var gameBall:Ball = new Ball(); 

    public function mainMenu(callBack) 
    { 
     var btnPlay:mmPlay = new mmPlay(); 
     btnPlay.addEventListener(MouseEvent.MOUSE_DOWN, brnP_Button); 
     btnPlay.x = width/2; 
     btnPlay.y = height/2 - btnPlay.height/2; 
     addChild(btnPlay); 

     var btnExit:mmExit = new mmExit(); 
     btnExit.addEventListener(MouseEvent.MOUSE_DOWN, brnE_Button); 
     btnExit.x = width/2; 
     btnExit.y = height/2 - btnExit.height/2; 
     btnExit.y += btnExit.height + 4; 
     addChild(btnExit); 

     ballY += GRAVITY 
     if (ballY < 0) 
     { 
      ballY += 5; 
     } 
     gameBall.x += ballX; 
     gameBall.y += ballY; 
     addChild(gameBall); 

     theCallBackFunction = callBack; 
    } 
    public function brnP_Button(e:MouseEvent) 
    { 
     theCallBackFunction(this, "game"); 
     return; 
    } 

    public function brnE_Button(e:MouseEvent) 
    { 
     theCallBackFunction(this, "exit"); 
     return; 
    } 


} 

} 

Answer 1

我通過創建這個函數並在添加gameBall之前運行它來解決了這個問題。

private function enterFrameHandler (e:Event):void 
{ 
    // Gravitate the Ball 
    ballY += GRAVITY; // The ball is effected by gravity each frame 

    // Move The Ball 
    gameBall.x += ballX; 
    gameBall.y += ballY; 
}