DisplayUtil.transformPoint convenience function

git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@794 ed5b42cb-e716-0410-a449-f6a68f950b19

src/as/com/threerings/flash/DisplayUtil.as

@@ -31,6 +31,15 @@ import flash.geom.Rectangle;
 
 public class DisplayUtil
 {
+    /**
+     * Transforms a point from one DisplayObject's coordinate space to another's.
+     */
+    public static function transformPoint (p :Point, fromDisp :DisplayObject, toDisp :DisplayObject)
+        :Point
+    {
+        return toDisp.globalToLocal(fromDisp.localToGlobal(p));
+    }
+
     /**
      * Adds newChild to container, directly below another child of the container.
      */