How implement real time history plot with data samples having varying timestamps?

[esutton]

Solved. ( Sorry, bad arithmetic calculating elapsed time - it should have been working all along )

The cpuplot source was used pretty much as is, simply replacing the timer event handler with my own code that I called when I received the updated time-stamped data sample:

// Update X-axis time series labels for the amount of time that has passed since last update
    double elapsedTimeIntervalSeconds = (structDataSample.timeStampMs - m_structDataSampleLast.timeStampMs) / 1000.0;
    m_structDataSampleLast = structDataSample;
    qDebug() << "Dbg: elapsedTimeIntervalSeconds = " << elapsedTimeIntervalSeconds << endl;
    for ( int j = 0; j < HISTORY_BUFFER_LENGTH; j++ )
    {
        timeDataSeries[j] = timeDataSeries[j] + elapsedTimeIntervalSeconds;
    }

// Update X-axis time series labels for the amount of time that has passed since last update
    double elapsedTimeIntervalSeconds = (structDataSample.timeStampMs - m_structDataSampleLast.timeStampMs) / 1000.0;
    m_structDataSampleLast = structDataSample;
    qDebug() << "Dbg: elapsedTimeIntervalSeconds = " << elapsedTimeIntervalSeconds << endl;
    for ( int j = 0; j < HISTORY_BUFFER_LENGTH; j++ )
    {
        timeDataSeries[j] = timeDataSeries[j] + elapsedTimeIntervalSeconds;
    }

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[krsree]

I'm also doing the same kind of application. I'm new to QWT and QT. Can u please upload the full code?