99 lines
2.1 KiB
C++
99 lines
2.1 KiB
C++
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#ifndef STAR_PERIODIC_HPP
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#define STAR_PERIODIC_HPP
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#include "StarMathCommon.hpp"
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#include "StarRandom.hpp"
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namespace Star {
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// Perform some action every X ticks. Setting the tick count to 0 means never
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// perform the action, 1 performs the action every call, 2 performs the action
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// every other call, and so forth.
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class Periodic {
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public:
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Periodic(unsigned everyXSteps = 1)
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: m_counter(0), m_everyXSteps(everyXSteps) {}
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unsigned stepCount() const {
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return m_everyXSteps;
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}
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void setStepCount(unsigned everyXSteps) {
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m_everyXSteps = everyXSteps;
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if (everyXSteps != 0)
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m_counter = clamp<unsigned>(m_counter, 0, m_everyXSteps - 1);
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else
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m_counter = 0;
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}
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// Will the next tick() return true?
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bool ready() const {
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return m_everyXSteps != 0 && m_counter == 0;
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}
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bool tick() {
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if (m_everyXSteps == 0)
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return false;
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if (m_counter == 0) {
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m_counter = m_everyXSteps - 1;
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return true;
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} else {
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--m_counter;
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return false;
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}
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}
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template <typename Function>
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void tick(Function&& function) {
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if (tick())
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function();
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}
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private:
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unsigned m_counter;
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unsigned m_everyXSteps;
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};
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// Perform some action with a given period over an amount of some value (like
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// time) with optional randomness.
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class RatePeriodic {
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public:
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RatePeriodic(double period = 1, double noise = 0)
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: m_period(period), m_noise(noise), m_counter(period + Random::randf(-noise, noise)), m_elapsed(0.0) {}
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double period() const {
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return m_period;
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}
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double noise() const {
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return m_noise;
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}
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template <typename Function>
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void update(double amount, Function&& function) {
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double subAmount = min(amount, m_counter);
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m_counter -= subAmount;
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amount -= subAmount;
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m_elapsed += subAmount;
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if (m_counter <= 0.0) {
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m_counter = m_period + Random::randf(-m_noise, m_noise);
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function(m_elapsed);
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m_elapsed = 0.0;
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if (amount > 0.0)
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update(amount, forward<Function>(function));
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}
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}
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private:
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double m_period;
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double m_noise;
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double m_counter;
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double m_elapsed;
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};
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}
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#endif
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