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Functionalities
0. The left mouse button adds a control point.
1. The middle mouse button is used to move control points.
2. The right mouse button removes a control point.
3. There are two display modes (accessible through the "Mode" menu):
- "Curve": just the curve.
- "Labels": the curve and the control polygon with labeled control points.
4. The "Clear" in the menu clears all the control points and the curve.