Qwt User's Guide  6.2.0
qwt_system_clock.cpp
1 /******************************************************************************
2  * Qwt Widget Library
3  * Copyright (C) 1997 Josef Wilgen
4  * Copyright (C) 2002 Uwe Rathmann
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the Qwt License, Version 1.0
8  *****************************************************************************/
9 
10 #include "qwt_system_clock.h"
11 #include <qelapsedtimer.h>
12 
15 {
16  return m_timer.isValid();
17 }
18 
21 {
22  m_timer.start();
23 }
24 
30 {
31  const qint64 nsecs = m_timer.restart();
32  return nsecs / 1e6;
33 }
34 
37 {
38  const qint64 nsecs = m_timer.nsecsElapsed();
39  return nsecs / 1e6;
40 }
void start()
Start the elapsed timer.
double elapsed() const
bool isNull() const