The link was very handy, and I had not come across it before. Thanks, it helped
a lot.
>
> all Bezier splines are cubic splines, but not
> all cubic splines are Bezier splines.
>

Doesn't this mean that we can use a set of Bezier points as a cubic_spline?
>
> Given your code, I don't exactly know what that means.
>

The bezier points create a perfect semi-circle. But, the above cubic_spline does
not because I gave the values (-0.25, 0, 1, 1.25) randomly.

My question is: how to find these values (-0.25, 0, 1, 1.25) according to the
given bezier points?

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