Hi Kalle, put that code I posted in the Ship class in the loop() method right before the “y += vy;” line. That should do it!

// enforce speed limit – find length of vector
// and scale down to maxSpeed if necessary
var currentSpeed:Number = Math.sqrt((vx * vx) + (vy * vy));
if(currentSpeed > maxSpeed){
vx *= maxSpeed / currentSpeed;
vy *= maxSpeed / currentSpeed;
}
___________________________________________________________

Where?
More exakt plz? =)

// enforce speed limit – find length of vector
// and scale down to maxSpeed if necessary
var currentSpeed:Number = Math.sqrt((vx * vx) + (vy * vy));
if(currentSpeed > maxSpeed){
vx *= maxSpeed / currentSpeed;
vy *= maxSpeed / currentSpeed;
}

Been working on using them to build a car game. So far, so good. have the engine.as and car.as built and running. Essentially using your ship.as class.

Now here is the thing I have movieclip built for the car. within it it has movieclip headlights to turn on and off. with frame labels = “headlightson” and “headlightsoff” similar to what you have done with the laser graphics here but included as movieclip inside the car movieclip.

Can I add keyboard event listener to Car.as so that when ctrl key is pressed the label is sent to headlightson (frame2)? and if pressed a second time to play headlightsoff (frame1)?

Sorry for the long post but movieclips within movieclips cause me no amount of troubles..

I am a super newbie with OOP of AS and followed through your tutorial and very found it very informative.. however, now I at a brick war as I am trying to add rocks and hitTest… can anyone help?

Other than a new class called Rock.as and added a destroy function in ship as well.. the code for the rest is more of less the same..

Has no clue how to identify which rock to test hit

Rock.as
==============================================================
package {

import flash.display.*;
import flash.events.*;

public class Rock extends MovieClip{
public var radius:Number;
public var cnum:Number;
var radians:Number=0;
var speed:Number=0;

public function Rock(inputRadius:Number):void {
radius=inputRadius;
speed=0.1+0.5*Math.random();
this.addEventListener (Event.ENTER_FRAME, moveCircle);
}

public function moveCircle (e:Event) {
radians += speed;

x+=Math.round(radius*Math.cos(radians))+1;
y+=Math.round(radius*Math.sin(radians))+1;

if (x > stage.stageWidth)
x = 0;
else if (x stage.stageHeight)
y = 0;
else if (y < 0)
y = stage.stageHeight;
}
}
}
============================================================
ship.as (addition)
public function destroy():void {
parent.removeChild(this);
removeEventListener(Event.ENTER_FRAME, loop);
}
=========================================================
main.fla

import flash.utils.Timer;

var level:int=1;

genRocks();

function genRocks() {
for (var count:int=0; count<level+2; count++) {
var randomSize=Math.random()*2;
var newRock:Rock=new Rock(randomSize);
addChild(newRock);

newRock.x=Math.random()*550;
newRock.y=Math.random()*400;

newRock.scaleX=Math.random()*2+1.5;
newRock.scaleY=Math.random()*2+1.5;
}
}
var gameTimer:Timer=new Timer(30);
gameTimer.addEventListener(TimerEvent.TIMER,gameTimerFunc);
gameTimer.start();

function gameTimerFunc(t:TimerEvent):void{
if(ship.hitTestObject(newRock)){
trace (”hit”);
ship.destroy();
gameTimer.stop();
}
}
=================================================

I get undefined property newRock.. please help! thanks!

I just finished a version of the original asteroids…
http://www.blurredistinction.com/test/roids.htm

For everyone else wanting this effect:

Just add the vx and vy of the ship to the constructor of the laser. Then when you setup the laser’s vx and vy in the constructor just add the vx and vy from the ship to it. This will screw up the rotation a bit so you’d need to adjust it but past that it will work as intended.