Photoshop script: How to find distance of grapic center related to the upper left cornet of canvas?

Photoshop script: How to find distance of grapic center related to the
upper left cornet of canvas?

My problem is this:

Is it possible to measure with Photoshop script (I use CS5.1) THE EXACT
(x,y) of the center of the graphic (as shown in the image), related to the
upper left corner of the canvas (0,0)? What is the tactic I should follow?
Anyone has an idea? (The graphic is in its own layer, and I want to do the
measure for each graphic, layer by layer).