Make QwtPlotRescaler reflect data changes

[Uwe]

The rescaler implicitely calls setAxisScale(), what disables autoscaling. Guess if you reenable autoscaling before calling updateAxes you probably have what you want:

void Window::switchData()
{
    if ( curve->maxYValue() > LO ) curve->setData( DATA_LO, DATA_LO, N );
    else curve->setData( DATA_HI, DATA_HI, N );
 
    for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
        plot->setAxisAutoScale(axis);
 
    plot->updateAxes();
    rescaler->rescale();
}

void Window::switchData()
{
    if ( curve->maxYValue() > LO ) curve->setData( DATA_LO, DATA_LO, N );
    else curve->setData( DATA_HI, DATA_HI, N );
   
    for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
        plot->setAxisAutoScale(axis);

    plot->updateAxes();
    rescaler->rescale();
}

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HTH,
Uwe