This demo includes a single graphical window that displays a curve
X(t) (which you may change in the appropriate textbox in the control
window), the osculating circle to X(t) at X(t0), the line
the center of the osculating circle to X(t0), which is
normal to the
curve and has length given by 1/kg(t0), and the evolute
curve (if the "Show evolute curve" box in the control window is
checked), which is
traced out by the center of the osculating circle. To
change t0, use the following buttons:
[<]: Decrease t0 by one step.
[>]: Increase t0 by one step.
[<<]: Decrease t0 until it reaches its minimum
[>>]: Increase t0 until it reaches its maximum