Mouse Hover On A Image

Actually we are doing POC on statemachine flow. From a UI Prospective I wanted to test this feature with Vaadin.
Scenario:- I have a mouse hover activity on a Image. This image has a different states. Each states of Images making one Image. Now from the Image I have to go to particular area of the image and the moment I do Mouse Hover Or I Click within that boundary area I should get the Tool TIp.

I know the ToolTip how to show, But my question is how you would do this Mouse Over Feature from the part of the Image. My Image would look like as shown below:-