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#pragma once
#include <math.h>
#include "accel-base.hpp"
namespace rawaccel {
/// <summary> Struct to hold sigmoid (s-shaped) acceleration implementation. </summary>
struct accel_sigmoid : accel_base {
double limit = 1;
double midpoint = 0;
accel_sigmoid(const accel_args& args) : accel_base(args) {
verify(args);
limit = args.limit - 1;
midpoint = args.midpoint;
}
inline double accelerate(double speed) const {
//f(x) = k/(1+e^(-m(c-x)))
return limit / (exp(-speed_coeff * (speed - midpoint)) + 1);
}
void verify(const accel_args& args) const {
if (args.limit <= 1) error("exponent must be greater than 1");
if (args.midpoint < 0) error("midpoint must not be negative");
}
};
}
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