OK, so I answered this one myself =)
DisplayObject has a function called localToGlobal() that takes a local
point, and returns one relative to the stage (global). It also has a
'partner' function called globalToLocal() which does the opposite.
So to get a point relative to an ancestor container, you call:
ancestor.globalToLocal(child.localToGlobal(child.x,child.y));
cheers!
Thunder
--- In flexcoders@yahoogroups.com, "thunderstumpgesatwork"
<[EMAIL PROTECTED]> wrote:
>
> Hi all,
>
> I am trying to catch a selection change event on a chart, and then
> position and show an HBox relative to a corner of the chart item.
>
> The HBox is a child of an outer canvas which houses several other
> containers including the chart, legend, etc.
>
> The X and Y position of the HBox is relative to the outer Canvas, but
> the X and Y position I have is for the chart item, and it's renderer.
>
> Are there any built-in functions that will convert the X-Y position on
> the chart item to it's ancestor (the canvas)?
>
> If not, would this recursive search up the 'parent' chain be an
> appropriate approach to doing so? It works for my situation, but I
> don't know if all 'parent' objects are required to have both an x-y
> combination and a 'parent' object as well...
>
> thanks,
> Thunder
> _______________________
>
> public function translateCoordinates(referenceObject:Object,
> ancestor:Object):Object
> {
> var oRet:Object=null;
> if ( (referenceObject != null) &&
> (referenceObject.x != null) &&
> (referenceObject.y != null) &&
> (referenceObject.parent != null) &&
> (ancestor != null)
> )
> {
> // assume we have valid objects
> if (referenceObject.parent == ancestor)
> {
> // the object's parent is the ancestor. its coordinates are
> relative to the ancestor
> oRet = new Object();
> oRet.x = referenceObject.x;
> oRet.y = referenceObject.y;
> }
> else
> {
> // keep looking up the chain of parents
> var oPos:Object =
> translateCoordinates(referenceObject.parent, ancestor);
> if (oPos != null)
> {
> // the relative position was found, add it to the current
> reference object
> oRet = oPos;
> oRet.x = referenceObject.x + oPos.x;
> oRet.y = referenceObject.y + oPos.y;
> }
> }
> }
> return oRet;
> }
>
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