Bezier.h

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//   ____   __                  __  __
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// \/_/\ \/\ \ \___      __    \ \ \_\ \    ___   __  __    ____     __
//    \ \ \ \ \  _ `\  /'__`\   \ \  _  \  / __`\/\ \/\ \  /',__\  /'__`\
//     \ \ \ \ \ \ \ \/\  __/    \ \ \ \ \/\ \L\ \ \ \_\ \/\__, `\/\  __/
//      \ \_\ \ \_\ \_\ \____\    \ \_\ \_\ \____/\ \____/\/\____/\ \____\
//       \/_/  \/_/\/_/\/____/     \/_/\/_/\/___/  \/___/  \/___/  \/____/
 
 
#pragma once
// undef some macros because they're conflicting and causing issues
#undef max
#undef min
 
#include "Utility/Curve/imgui_bezier.hpp"
#include "Utility/Math/Vector4D.h"
 
 
namespace th
{
 
struct Bezier
{
    Bezier() = default;
 
    Bezier(Vector4D handle1, Vector4D handle2);
 

    auto operator()(float t) -> float;
 

    template <typename P>
    auto operator()(float t, const P& begin, const P& end) -> P
    {
        return value(t, begin, end);
    }
 

    auto value(float t) -> float;

    template <typename P>
    auto value(float t, const P& start, const P& end) -> P
    {
        // starts at 0, ends at 1
        auto fromEnd = value(t);
        // starts at 1, ends at 0
        auto fromBegin = 1 - fromEnd;
 
        return fromBegin * start + fromEnd * end;
    }

    auto data() -> float*;
 
 
    friend auto to_json(json& j, const Bezier& n) -> void;
 
    friend auto from_json(const json& j, Bezier& n) -> void;
 
private:
    float handles[4] = {0.455f, 0.030f, 0.515f, 0.955f};

    float selectedPreset = 0.f;
 
};
 
}