Stopwatch.cpp

Go to the documentation of this file.

 
 
#include <SDL3/SDL_timer.h>
 
#include "Stopwatch.hpp"
 
namespace galaxy
{
    Stopwatch::Stopwatch()
        : m_stopped {true}
        , m_paused {false}
        , m_repeat {false}
        , m_start_ticks {0}
        , m_paused_ticks {0}
        , m_delay {1000}
        , m_callback {nullptr}
    {
    }
 
    Stopwatch::~Stopwatch()
    {
        stop();
    }
 
    void Stopwatch::set(Stopwatch::Function&& func, const std::uint64_t delay)
    {
        m_callback = std::move(func);
        m_delay    = delay;
    }
 
    void Stopwatch::repeat(const bool repeat)
    {
        m_repeat = repeat;
    }
 
    void Stopwatch::start()
    {
        m_stopped = false;
        m_paused  = false;
 
        m_start_ticks  = SDL_GetTicksNS();
        m_paused_ticks = 0;
    }
 
    void Stopwatch::stop()
    {
        m_stopped = true;
        m_paused  = false;
 
        m_start_ticks  = 0;
        m_paused_ticks = 0;
    }
 
    void Stopwatch::pause()
    {
        if (!m_stopped && !m_paused)
        {
            m_paused = true;
 
            m_paused_ticks = SDL_GetTicksNS() - m_start_ticks;
            m_start_ticks  = 0;
        }
    }
 
    void Stopwatch::unpause()
    {
        if (!m_stopped && m_paused)
        {
            m_paused = false;
 
            m_start_ticks  = SDL_GetTicksNS() - m_paused_ticks;
            m_paused_ticks = 0;
        }
    }
 
    void Stopwatch::update()
    {
        if (!m_stopped && !m_paused)
        {
            if (get_time_passed() >= m_delay)
            {
                m_callback();
 
                if (!m_repeat)
                {
                    stop();
                }
            }
        }
    }
 
    bool Stopwatch::stopped() const
    {
        return m_stopped;
    }
 
    bool Stopwatch::paused() const
    {
        return m_paused && !m_stopped;
    }
 
    std::uint64_t Stopwatch::get_time_passed() const noexcept
    {
        std::uint64_t time = 0;
 
        if (!m_stopped)
        {
            if (m_paused)
            {
                time = m_paused_ticks;
            }
            else
            {
                time = SDL_GetTicksNS() - m_start_ticks;
            }
        }
 
        // We need to convert because time_passed is in MS while
        // timer is in NS.
        return time / 1000000;
    }
} // namespace galaxy