zooming only x

I need to plot a set of data, and then I need to zoom only the x axis, and panning to scroll the plot.
Using simple_plot.cpp example I am able to plot data vector.
Then how can I zoom x axis?

thanks

ps: I tried QwtPlotMagnifier with poor results.

With QwtPlotZoomer you can zoom in/out by selecting rectangles with the rubberband. A zoomer is always related to an x and a y axis. With zoomer->setAxis(int, int) you can change this relation. Use an invalid id for the y axis to disable it.

QwtPlotMagnifier uses wheel/mouse events to zoom in/out in steps. The default magnifier is zooms all axes. You can change this with QwtPlotMagnifier::setAxisEnabled().

Uwe