>is there a way to transform a graph that I've built interactively to code? I should need to change the width ,height, some lines (more thin, more fat) and points of my formatted graph. It is no easy interactively.

Cesar Chalom has written a great article on a related topic. I don't know if that would help you but it contains some great information.

http://www.utmag.com/wconnect/wc.dll?9,7,10,,2094