Bike trainer race desk app with Processing and Arduino

We have a source code of a graphic bike trainner and we want to add extra features on it, the hardware is Arduino and collect some values from the bycicle and input to the computer, then Processing read the values (in live) and creates charts of speed and distance.. at now it works perfect but we want to add more features, like have 2 trainer making a versus each other, so must have 2 different value inputs and make 2 values in the same chart. also make the graphics more nicely and another little features. we wish to be programming in Processing due the piece of code than we have and works good, but could be another kind of language... I will add more information this wednesday Ago 1...