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#pragma once
#include <math.h>
#include "accel-base.hpp"
namespace rawaccel {
/// <summary> Struct to hold power (non-additive) acceleration implementation. </summary>
struct accel_power : accel_base {
double exponent;
double offset;
accel_power(const accel_args& args) {
verify(args);
weight = args.weight;
speed_coeff = args.power_scale;
exponent = args.exponent;
offset = args.offset;
}
inline double accelerate(double speed) const {
// f(x) = (mx)^k
return (offset > 0 && speed < 1) ? 1 : pow(speed * speed_coeff, exponent);
}
inline vec2d scale(double accel_val) const {
return {
weight.x * accel_val,
weight.y * accel_val
};
}
void verify(const accel_args& args) const {
if (args.power_scale <= 0) bad_arg("scale must be positive");
if (args.exponent <= 0) bad_arg("exponent must be greater than 0");
}
};
}
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