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QwtSystemClock(3) Qwt User's Guide QwtSystemClock(3)

QwtSystemClock - QwtSystemClock provides high resolution clock time functions.

#include <qwt_system_clock.h>


QwtSystemClock ()
Constructs a null clock object. virtual ~QwtSystemClock ()
Destructor. bool isNull () const
void start ()
double restart ()
double elapsed () const

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).

( QwtSystemClock is obsolete since Qt 4.8 as QElapsedTimer offers the same precision )

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.

Returns:

Number of milliseconds that have elapsed since the last time start() or restart() was called or 0.0 for null clocks.

Returns:

true if the clock has never been started.

Set the start time to the current time

Returns:

Time, that is elapsed since the previous start time.

Sets the start time to the current time.

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Wed Jan 2 2019 Version 6.1.4