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QwtSystemClock(3) Qwt User's Guide QwtSystemClock(3) NAME
QwtSystemClock - QwtSystemClock provides high resolution clock time functions. SYNOPSIS
#include <qwt_system_clock.h> Public Member Functions QwtSystemClock () virtual ~QwtSystemClock () bool isNull () const void start () double restart () double elapsed () const Static Public Member Functions static double precision () Detailed Description QwtSystemClock provides high resolution clock time functions. Sometimes the resolution offered by QTime ( millisecond ) is not accurate enough for implementing time measurements ( f.e. sampling ). QwtSystemClock offers a subset of the QTime functionality using higher resolution timers ( if possible ). Precision and time intervals are multiples of milliseconds (ms). Note: The implementation uses high-resolution performance counter on Windows, mach_absolute_time() on the Mac or POSIX timers on other systems. If none is available it falls back on QTimer. Constructor &; Destructor Documentation QwtSystemClock::QwtSystemClock () Constructs a null clock object. QwtSystemClock::~QwtSystemClock () [virtual] Destructor. Member Function Documentation double QwtSystemClock::elapsed () const Returns: Number of milliseconds that have elapsed since the last time start() or restart() was called or 0.0 for null clocks. bool QwtSystemClock::isNull () const Returns: true if the clock has never been started. double QwtSystemClock::precision () [static] Returns: Accuracy of the system clock in milliseconds. double QwtSystemClock::restart () The start time to the current time and return the time, that is elapsed since the previous start time. void QwtSystemClock::start () Sets the start time to the current time. Author Generated automatically by Doxygen for Qwt User's Guide from the source code. Version 6.0.0 Fri Apr 15 2011 QwtSystemClock(3)
