Bézier Curves

another Spline class that has more intuitive controls

A Cubic Bézier Spine has four control points, two of which are knots.

Could have more than 2 control point, (but then no more cubic)

Second and next to last point define the tangent to the curve

Bezier spline is a way to define a curve by sequence of two end points and one or more control points which control
the curve.
Two end points are called Anchor Points.
The bezier splines with two control points are called Cubic Bezier Spline.