D:/Programmierung/C/TRTK/src/Clock.cpp

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/*
    Copyright (C) 2010 - 2014 Christoph Haenisch

    Chair of Medical Engineering (mediTEC)
    RWTH Aachen University
    Pauwelsstr. 20
    52074 Aachen
    Germany

    See license.txt for more information.

    Version 0.1.3 (2019-06-12)
*/

#include "TRTK/Clock.hpp"
#include "TRTK/ErrorObj.hpp"


namespace TRTK
{


Clock::Clock() : m_time_when_paused(0), state(RUNNING)
{
    m_time = std::clock();
}


double Clock::elapsed_time() const
{
    switch(state)
    {
        case RUNNING:
            return static_cast<double>(std::clock() - m_time) / CLOCKS_PER_SEC;
            break;

        case PAUSED:
            return static_cast<double>(m_time_when_paused) / CLOCKS_PER_SEC;
            break;

        default:
            ErrorObj error;
            error.setClassName("Clock");
            error.setFunctionName("elapsed_time");
            error.setErrorCode(UNKNOWN_STATE);
            throw error;
    }
}


void Clock::pause()
{
    switch(state)
    {
        case RUNNING:
            m_time_when_paused = std::clock() - m_time;
            state = PAUSED;
            break;

        case PAUSED:
            // do nothing
            break;
    }
}


void Clock::reset()
{
    m_time = std::clock();
    m_time_when_paused = 0;
}


void Clock::resume()
{
    switch(state)
    {
        case RUNNING:
            // do nothing
            break;

        case PAUSED:
            m_time = std::clock() - m_time_when_paused;
            state = RUNNING;
            break;
    }
}


void Clock::wait_milliseconds(const double time) const
{
    clock_t start_time = std::clock();

    while (static_cast<double>(std::clock() - start_time) / CLOCKS_PER_SEC < time / 1000.0)
    {
        // do nothing
    }
}


void Clock::wait_seconds(const double time) const
{
    clock_t start_time = std::clock();

    while (static_cast<double>(std::clock() - start_time) / CLOCKS_PER_SEC < time)
    {
        // do nothing
    }
}




std::ostream & operator<< (std::ostream & output, Clock & clock)
{
    output << "Elapsed time: " << clock.elapsed_time() << " seconds." << std::endl;
    return output;
}


} // namespace TRTK