Good day!

Tell me how to implement the trail. features:
1. We must do whatever QwtMagnifier did increase only Y. I think that i can do this in this way:

Qt Code: 
  1. ((QwtPlotMagnifier *) new QwtPlotMagnifier (canvas ())) -> setAxisEnabled (QwtPlot :: yLeft, false);
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But then you have something to tell him that when I start to diminish, that it had not reduced less than some initial state, ie I suppose the graph starts at (0,0), then I need that after the increase, when I decide to return to its original state and start to decrease, that would not make it ( X ) less than zero ... How can this be implemented?

2. If I have, for example, there are two QwtPlots and I need to do so, that would be if I increase on the same plot, 2nd plot increased, too, as well as the first. How can this be implemented?

Thank you for your attention.
Sincerely,
carhun