bezier.hpp

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#pragma once
 
#include "util/namedtype.hpp"
 
namespace deepnote
{
 
namespace nt
{
using ControlPoint1 = NamedType<float, struct ControlPoint1Tag>;
using ControlPoint2 = NamedType<float, struct ControlPoint2Tag>;
}; // namespace nt
 
struct BezierUnitShaper
{
    BezierUnitShaper() = default;
 
    explicit BezierUnitShaper(const nt::ControlPoint1 y2, const nt::ControlPoint2 y3)
        : y2(y2.get())
        , y3(y3.get())
    {
    }
 
    BezierUnitShaper(const BezierUnitShaper &other)            = default;
    BezierUnitShaper &operator=(const BezierUnitShaper &other) = default;
 
    float operator()(const float t) const
    {
        float y = (1 - t) * (1 - t) * y1 + 3 * (1 - t) * (1 - t) * t * y2 + 3 * (1 - t) * t * t * y3 + t * t * t * y4;
 
        return y;
    }
 
  private:
    float y1{0.f}; //  start point
    float y2{0.f}; //  control point 1
    float y3{0.f}; //  control point 2
    float y4{1.f}; //  end point
};
 
} // namespace deepnote