如何让子弹移动 Actionscript 3.0

Question

我正在制作一个非常简单的 Flash 游戏来理解 AS3。我做了一个带控件的 cirkel。当我按下 space 时，我想发射子弹。我已经尝试过 for、while 循环和不同的教程，但我就是不知道该怎么做。这是我的代码：

import flash.net.drm.LoadVoucherSetting;

//controls 
stage.addEventListener(KeyboardEvent.KEY_DOWN, reportKeyDown);
var dir:String = "default";

function reportKeyDown(event:KeyboardEvent):void
{
if (event.keyCode == Keyboard.LEFT)
{
    ball_mc.x -=  10;
    dir = "venstre";
}
if (event.keyCode == Keyboard.RIGHT)
{
    ball_mc.x +=  10;
    dir = "hojre";
}
if (event.keyCode == Keyboard.UP)
{
    ball_mc.y -=  10;
    dir = "op";
}
if (event.keyCode == Keyboard.DOWN)
{
    ball_mc.y +=  10;
    dir = "ned";
}
if (event.keyCode == Keyboard.SPACE)
{
    shootBullet();
}
}

var speed1:int = 1;
function shootBullet():void
{
//instantiate your object
var bullet:Bullets = new Bullets  ;

//add it to the stage
addChild(bullet);

//object will default to x=0 , y=0 so you can define that as well
bullet.x = ball_mc.x;
bullet.y = ball_mc.y +(ball_mc.width/2);

bullet.y += 10 * 2;

}

stop();

Answer 1

要让它移动，您需要使用一些以一定间隔重复发生的事件。
A Timer:

var myTimer:Timer = new Timer(25);//interval, milliseconds
myTimer.addEventListener(TimerEvent.TIMER, timerHandler);
myTimer.start();

var speedX:int = 0;
var speedY:int = 1;
function timerHandler(event:TimerEvent):void {
    bullet.y += speedX;
    bullet.x += speedY;
}

或 ENTER_FRAME 事件：

addEventListener(Event.ENTER_FRAME, onFrame);
function onFrame(event:Event):void {
    bullet.y += speedX;
    bullet.x += speedY;
}

如何让子弹移动 Actionscript 3.0

how do I make the bullet move Actionscript 3.0

flash

actionscript-3