zoomer doesn't zoom into the correct rectangle?

[kja]

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?

class MyZoomer : public QwtPlotZoomer
{
public:
  MyZoomer(int xAxis, int yAxis, QwtPlotCanvas *canvas):
    QwtPlotZoomer(xAxis, yAxis, canvas)
  {
    setTrackerMode(ActiveOnly);
  }
};
 
class MyPlot : public QwtPlot
{
  CurveAttrib ** curves;
public:
  MyPlot(){
    myZoomer[0] = new MyZoomer(QwtPlot::xBottom, QwtPlot::yLeft, this->canvas());
    myZoomer[1] = new MyZoomer(QwtPlot::xBottom, QwtPlot::yRight, this->canvas());
    enableAxis(QwtPlot::yRight);
  }
  MyZoomer *myZoomer[2];
 
void plotMyPlot(){
....
 
    myZoomer[0]->setZoomBase();    
    myZoomer[1]->setZoomBase();
    this->setAxisAutoScale(yLeft); 
    this->setAxisAutoScale(yRight); 
    this->setAxisAutoScale(xBottom); 
  }
};
#endif

class MyZoomer : public QwtPlotZoomer
{
public:
  MyZoomer(int xAxis, int yAxis, QwtPlotCanvas *canvas):
    QwtPlotZoomer(xAxis, yAxis, canvas)
  {
    setTrackerMode(ActiveOnly);
  }
};

class MyPlot : public QwtPlot
{
  CurveAttrib ** curves;
public:
  MyPlot(){
    myZoomer[0] = new MyZoomer(QwtPlot::xBottom, QwtPlot::yLeft, this->canvas());
    myZoomer[1] = new MyZoomer(QwtPlot::xBottom, QwtPlot::yRight, this->canvas());
    enableAxis(QwtPlot::yRight);
  }
  MyZoomer *myZoomer[2];
 
void plotMyPlot(){
....

    myZoomer[0]->setZoomBase();    
    myZoomer[1]->setZoomBase();
    this->setAxisAutoScale(yLeft); 
    this->setAxisAutoScale(yRight); 
    this->setAxisAutoScale(xBottom); 
  }
};
#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

[Uwe]

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

No, but what about debugging the rectangle that is passed to QwtPlotZoomer::zoom(const QwtDoubleRect &) ?

Uwe

PS: You could also debug the QwtPlotZoomer::zoomed() signal