Question

我正在制作一个非常简单的Flash游戏来了解AS3。我用控件制作了一个圆圈。当我按下空间时，我想发射一颗子弹。我试过，虽然循环和不同的教程，但我只是无法弄清楚如何做到这一点。这是代码：

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

要使其移动，您需要使用某些间隔重复发生的事件一个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;
}

如何使子弹移动Actionscript 3.0

1 个答案: