在使用Java代码在selenium webdriver中可拖动的两个框之间画一条线

I am working on selenium web driver and my Appliction does not support css selector. In my application, I have Flowchart page where I need to add FlowChart. I have drag and drop two rectangle boxes in the flowchart page where each rectangle boxes has four arrows. Use one of the arrows from the source rectangle box should connect to the top arrow of the destination rectangle box. I dont know how to connect both the boxes. Also, if we drag one of the arrows from the source to target point, it will draw a line between the two.I am working on selenium web driver and my Appl