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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