QwtPlotZoomer zooming off the plot canvas

[Uwe]

class YourZoomer: public QwtPlotZoomer
{
    ....
 
    virtual void zoom( const QRectF &rect )
    {
        QwtPlotZoomer::zoom( rect & zoomBase() );
    }
};

class YourZoomer: public QwtPlotZoomer
{
    ....

    virtual void zoom( const QRectF &rect )
    {
        QwtPlotZoomer::zoom( rect & zoomBase() );
    }
};

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Uwe