value_chase.hpp

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#pragma once
 
#include <chrono>
#include <glm/common.hpp>
 
namespace Eng3D {
    template <typename T>
    class ValueChase {
        float friction;
        std::chrono::system_clock::time_point last_time;
    public:
        constexpr ValueChase(float _friction) noexcept
            : friction{ _friction }
        {
 
        }
 
        constexpr T move_towards(T current, T target) {
            auto now = std::chrono::system_clock::now();
            float time = std::chrono::duration_cast<std::chrono::milliseconds>(now - last_time).count();
            time /= 1e3;
            time *= (1.f / friction);
            time = glm::min(time, 1.f);
            last_time = now;
            T distance = target - current;
            T step = distance * time;
            // const float tolerance = 10.f;
            // T new_current = glm::round((current + step) * tolerance) / tolerance;
            return current + step;
        }
    };
}