No, you want to save the current scales - the zoomer is only a helper class, that manipulates the scales.
Do you mean this combination of functions? (for 2 axis)
Qt Code: 
  1. //saving the current scales
  2. QwtScaleEngine * 	axisScaleEngine (0)
  3. QwtScaleEngine * 	axisScaleEngine (1)
  4. //loading saved scales
  5. void 	setAxisScaleEngine (int axisId, QwtScaleEngine *)
  6. void 	setAxisScaleEngine (int axisId, QwtScaleEngine *)
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