I am building an XY-plotter, using lego mindstorms. This menas that I have to control 3 engines, (of with two will be indentical, X-axis, and the othert one will be the Y-axis movement), To do this I need a driver on the NXT, which will allow me to program in such a way that the robot will follow an image. I have found two that seem sutible, RobotC, which is C based, and Robolab, which is graphic based. Has anyone worked with these? Which is most sutible??