flash actionscript: to appear to control the registration point of line, make it a child or an
empty display object and offset it by -x,-y where x,y is your choice for the
apparent registration point. you can then control the parent object and it
will behave like your line with changed registration point.

I am new to AS3 and have a doubt on Registration point for Movie clip / Sprite.
Please help me the sample code for this

I simply draw a line using AS3 in flash environment. but i used
graphics.moveTo for center. but if i run this it is simply taking x,y axis 0,0
and move around the stage. I want to move this from center of the stage. please
help.

below is my code

var line:Sprite = new Sprite()
addChild(line);

var cx:Number = stage.stageWidth/2;
var cy:Number = stage.stageHeight/2;

var radius:Number = 1;
var increase:Number = 0;

line.graphics.lineStyle(1, 0xff00ff);

line.addEventListener(Event.ENTER_FRAME, onEnter);

function onEnter(event:Event):void
{
increase += radius;

//trace(increase);
//line.graphics.moveTo(cx, cy);
line.graphics.lineTo(cx + increase, cy + increase);
line.rotation += 0.1;
}