Migrating AS2 Code to AS3

Question

ORIGINAL AS1 SCRIPT
I have already tried several ways to migrate this code, but I
get unexpected behaviors. Can any one help me?
The volume control on the stage is made out of two
movieClips: one called knob and the other volume_track over which
the knob slides (is dragged by user) This two Clips are turned into
one movieClip called volume_control. The Sound Object is within an
Empty MovieClip called soundMc. the pos variable gathers the knob's
position on the volume_track.
The following code is the original one, which works
perfectly.

Answer 1

Hi, Kglad,
I had made a mistake, that's why the code didn't work at all.
My bad.
I modified a little the code you suggested as well as the
Clips Instance Names.
I used the Rectangle Class to get the
startDrag(lockCenter:Boolean = false, bounds:Rectangle = null)
method's bound argument. This is how the Rectangle is set up:
Rectangle(x:Number, y:Number, width:Number, height:Number);
It works now, but there's a couple of unexpected things
happening.
1. It really hard to make the knob move left and right
because the cursor seems not to get a firm hold of it.
2. Once it starts dragging, I have to move it very slowly
otherwise I lose a hold on the knob.
3 - In order to get the knob to drag within the bounderies of
its track, I had to add extra numbers in the x (8 instead of 0),
width (a -12), and height (0 instead of e.currentTarget.y), but
this poses a problem later when I try to get a definite value to
control the volume intensity between 0.0 (Minimum volume) and 1.0
(Max Vol). Tracing pos, I got these results:
Min pos: 0.10810810810810811
Max pos: 0.9459459459459459
Is there a way to clean up those results, like a Math
function, so that I can get something like this 0.1 and 0.9 instead
of those long numbers?
volume_control.volKnob.addEventListener(MouseEvent.MOUSE_DOWN,
dragKnob);
volume_control.volKnob.addEventListener(MouseEvent.MOUSE_UP,
stopKnob);
volume_control.volKnob.addEventListener(MouseEvent.MOUSE_OUT,
stopKnob);
var t:Timer=new Timer(70,0);
t.addEventListener(TimerEvent.TIMER,volF);
function dragKnob(e:MouseEvent) {
trace("Begin dragging");
var rect:Rectangle = new Rectangle(8, e.currentTarget.y,
e.currentTarget.parent.volTrack.width-12, 0);
e.currentTarget.startDrag(false, rect);
t.start();
function stopKnob(e:MouseEvent) {
trace("Stop draggin");
e.currentTarget.stopDrag();
t.stop();
function volF(e:TimerEvent) {
var pos:Number =
(volume_control.volKnob.x/volume_control.volTrack.width);
//soundObjChannel.soundTransform.volume =pos; // you need to
define your soundChannel object whereever you're applying the play
method to your sound object
trace("pos" + pos);
}