In one alternative embodiment, the invention is directed to a graphical user interface having a graph space in which a user may create a graph that may be used to control the injection behavior of a fluid injection device. In some embodiments, the graphical user interface may include a graphical visualization tool having a graph space window for inputting and displaying a desired injection function for a fluid； one or more fluid selector icons that may permit a user to select a fluid； and a location selection icon that may permit a user to navigate within the graph space to create an injection function for a selected fluid. In some embodiments, one or more injection functions may be graphically plotted within the same graph space to define an injection protocol.
