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#pragma once
#include <math.h>
#include "accel-base.hpp"
namespace rawaccel {
/// <summary> Struct to hold "natural" (vanishing difference) gain implementation. </summary>
struct accel_naturalgain : accel_base {
double limit = 1;
double midpoint = 0;
accel_naturalgain(const accel_args& args) : accel_base(args) {
verify(args);
limit = args.limit - 1;
speed_coeff /= limit;
}
inline double accelerate(double speed) const {
// f(x) = k((e^(-mx)-1)/mx + 1)
double scaled_speed = speed_coeff * speed;
return limit * (((exp(-scaled_speed) - 1) / scaled_speed) + 1);
}
void verify(const accel_args& args) const {
if (args.limit <= 1) bad_arg("limit must be greater than 1");
}
};
}
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