Use the routine developed in the previous exercise to allow the user to edit the control points using keyboard input as in Exercise 2. Controls points should be displayed in the same manner.
Write a program using the routine developed in the previous exercise to display a twodimensional cardinal spline curve in the xy plane along with the control points used to generate the curve. The curve should be drawn in black (on a white background) and the control points should be drawn in blue. Additionally, allow the user to modify the control points via keyboard input. The user should be able to cycle through the control points and move each one around in the xy plane. The currently selected control point should be drawn in red. The curve should be redrawn each time a control point is moved.
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