Building Bezier curve

[niemandkun]

Need to implement cubic interpolation with Bezier curves:

For a given time moment t and points p1, p2, p3, p4 find point p using a cubic Bezier interpolation between p1, p2, p3, p4 at the time moment t.

See:

• https://en.wikipedia.org/wiki/Bézier_curve
• http://md.gl/guidelines/motion/duration-easing.html
• http://cubic-bezier.com