This demo includes a single graphical display window that displays the curve X(t) = A + x(t)B + y(t)C. By default, it shows a circle of radius r with x(t) = r*cos(t) and y(t) = r *sin(t). You can change t0, A, B, C, r, x(t), and y(t) and choose whether or not to show the entire curve and the position vector X(t0) in the control window.