Hi everybody!

I've implemented simple class derived from QwtPlot , it contains 3 pointers:
Qt Code: 
  1. QwtPlotCurve *curve1;
  2. QwtPlotCurve *curve2;
  3. QwtPlotZoomer* zoomer;
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in constructor I create objects:
Qt Code: 
  1. curve1 = new QwtPlotCurve("Curve 1");
  2. curve1->attach(this);
  3. curve2 = new QwtPlotCurve("Curve 2");
  4. curve2->attach(this);
  5.  
  6. zoomer = new QwtPlotZoomer( canvas() );
  7. zoomer->setTrackerPen( QColor( Qt::black ) );
  8. zoomer->setTrackerMode(QwtPicker::AlwaysOff);
  9. zoomer->setMousePattern( QwtEventPattern::MouseSelect2,    Qt::RightButton, Qt::ControlModifier );
  10. zoomer->setMousePattern( QwtEventPattern::MouseSelect3,   Qt::RightButton );
  11. zoomer->setZoomBase();
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There is a function inside my class to assign data to curves, it basically does:
Qt Code: 
  1. QwtPointSeriesData* myData = new QwtPointSeriesData;
  2. ...
  3. curve1->setData(myData); // or  curve2->setData(myData); , only one curve updated at a time
  4. zoomer->setZoomBase();
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And here is what happens - I have two different data sets with quite different value scales. I can call function to assign one particular dataset to curve. If I assign one dataset and then another without zooming graph it works perfect, but , if I zoom with first dataset and then switch to another zoomer will lock on a range of the first datset. It seems to me that there is something that prevents value ranges from update so, to fix this I tried:
- to reset zoom to 0 level before actual update of curve - not working
- to detach curve object from plot and attach it after update of dataset - not working

Is there anything I can do to correctly update zoomer state after data changes?

Thanks in advance!

PS: QWT ver 6.0.1 , Qt 4.7.4