Hi,

Anyone have any idea why my zoomer zooms fine until I try to zoom into the area on the far right of the qwtplot?

It seems to work fine on the first 3/4 of my plot (from left to right), but when I zoom on my curve on the far right side of my plot it returns a blank area that is farther down the x axis than the area I selected.


any ideas?

Qt Code: 
  1. class MyZoomer : public QwtPlotZoomer
  2. {
  3. public:
  4.   MyZoomer(int xAxis, int yAxis, QwtPlotCanvas *canvas):
  5.     QwtPlotZoomer(xAxis, yAxis, canvas)
  6.   {
  7.     setTrackerMode(ActiveOnly);
  8.   }
  9. };
  10.  
  11. class MyPlot : public QwtPlot
  12. {
  13.   CurveAttrib ** curves;
  14. public:
  15.   MyPlot(){
  16.     myZoomer[0] = new MyZoomer(QwtPlot::xBottom, QwtPlot::yLeft, this->canvas());
  17.     myZoomer[1] = new MyZoomer(QwtPlot::xBottom, QwtPlot::yRight, this->canvas());
  18.     enableAxis(QwtPlot::yRight);
  19.   }
  20.   MyZoomer *myZoomer[2];
  21.  
  22. void plotMyPlot(){
  23. ....
  24.  
  25.     myZoomer[0]->setZoomBase();    
  26.     myZoomer[1]->setZoomBase();
  27.     this->setAxisAutoScale(yLeft); 
  28.     this->setAxisAutoScale(yRight); 
  29.     this->setAxisAutoScale(xBottom); 
  30.   }
  31. };
  32. #endif
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I'm not doing very fancy stuff with my zoomer but I know it has to be in my code because if I use a QwtPlotZoomer zoomer = new QwtPlotZoomer it works just fine

Thanks