Stumped on easiest of things (controlling a MC)

programming flash
1

Hi,

I am hoping you can help, but I have a really dumb question.

I am still learning actionscript 3 so I decided to look at some tutorials on the internet to help. All I am trying to achieve is move a movie clip using the arrow keys. The problem is, it is driving me insane!

Basically, I tried copying a tutorial but recieved compiling errors. So I downloaded the code and it works perfectly. So I decided to copy and paste that code into my own flash document which uses the same graphics and instance names - BUT it still doesnt run at all! I get about 10 compiling errors about “Access to Undefined property”. I know it is more than likely a simple problem, like a spelling mistake - but can someone help?

I can upload a recording of my steps I take which may assist in understanding what went wrong

2

Oops, sorry. I guess that would help

var speed:Number = 4;
object_mc.onEnterFrame = function() {
if (Key.isDown(Key.RIGHT)) {
this._x = this._x+speed;
} else if (Key.isDown(Key.LEFT)) {
this._x = this._x-speed;
}
if (Key.isDown(Key.UP)) {
this._y = this._y-speed;
} else if (Key.isDown(Key.DOWN)) {
this._y = this._y+speed;
}
};

What i find weird is that it works in one flash program, then when copy and pasted over it gets compiling errors.

3

_x and _y are now just x and y in as3.

4

Also, for AS3 it’s better to use the EventListener model. You should look for an AS3 tutorial instead.

5

Yep you should look into an Actionscript 3 tutorial if you want to learn it in Actionscript 3 :wink:
For this example Actionscript 3 is probably alot longer, but it’s more obvious too.