[RomECH]

import flash.events.MouseEvent;
//fla file
 
import flash.display.Sprite;
import flash.display.DisplayObject;
 
var X:Number = 0;
var Y:Number = 0;
 
stage.addEventListener(MouseEvent.MOUSE_DOWN, begin)
function begin (evt:MouseEvent) {
    var X:Number = mouseX;
    var Y:Number = mouseY;
}
stage.addEventListener(MouseEvent.MOUSE_UP, end);
function end (evt:MouseEvent) {
    var R:Number = Math.sqrt(Math.pow(mouseX-X, 2)+Math.pow(mouseY-Y, 2));
    var round:Sprite = test(X, Y, R);
    addChild(round);
}

//test.as
package
{
    import flash.display.Sprite;
 
    public function test(X:Number, Y:Number, R:Number):Sprite
    {
        var sp:Sprite = new Sprite();
        sp.graphics.lineStyle(1, 0x0);
        sp.graphics.drawCircle(X, Y, R);
        return (sp);
    }
}