Bezier

One-dimensional Bezier polynomial (page 138 [1]).

///   Bezier {
///     control_points = 5
///     control_point_y = 0.1~0.1<0,1>
///   }
/// 

or

\verbatim

/ Bezier { / control_points = 3 / Y0 = 0 if omitted will be assumed zero / Y1 = 1 / Y2 = 0 / } /

If control_point_y is not defined, then we look for the value of the
control points Y_i. If Y_i is omitted then it is assumed 0.

[1]
http://web.eecs.umich.edu/faculty/grizzle/papers/Westervelt_biped_control_book_15_May_2007.pdf 

Inherits from Function.

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