Getting mouse coordinates on stage

In ActionScript 3.0, displayObject instances have mouseX/mouseY properties; MouseEvent instance have localX/localY properties and stageX/stageY properties.

If there are other displayObject instances on stage and when cursor rolls over any of them, mouseX/mouseY becomes relative to that instance as opposed to relative to stage. To get the mouse coordinates relative to the stage, use stageX/stageY properties.

Or use localToGlobal method of displayObject class. Like this:

import flash.events.MouseEvent;
import flash.text.TextField;
import flash.geom.Point;
//var _foo:TextField;
function onMouseMove(evt:MouseEvent){
//trace(evt.target.mouseY);
var target:* = evt.target;
//_foo.text = target.mouseY;
//_foo.text = evt.localY.toString();

var location:Point = new Point(target.mouseX, target.mouseY);
location = target.localToGlobal(location);
_foo.text = target.mouseY + ": "+ location.y;}

//root.addEventListener(MouseEvent.MOUSE_MOVE, onMouseMove);
stage.addEventListener(MouseEvent.MOUSE_MOVE, onMouseMove);