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#pragma once
#include <math.h>
#include "accel-base.hpp"
namespace rawaccel {
/// <summary> Struct to hold "natural" (vanishing difference) acceleration implementation. </summary>
struct natural_impl {
double rate;
double limit;
double offset;
natural_impl(const accel_args& args) :
rate(args.accel), limit(args.limit - 1), offset(args.offset)
{
rate /= limit;
}
inline double operator()(double speed) const {
// f(x) = k(1-e^(-mx))
double base_speed = speed + offset;
return limit * (1 - ((exp(-rate * speed) * speed + offset) / base_speed));
}
inline double legacy_offset(double speed) const {
return limit - (limit * exp(-rate * speed));
}
};
using accel_natural = additive_accel<natural_impl>;
}
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