plotzoomer.h

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#ifndef PLOTZOOMER_H
#define PLOTZOOMER_H

#include <QObject>
#include "qwt_plot_zoomer.h"

class PlotZoomer : public QwtPlotZoomer
{
public:
    PlotZoomer();

    explicit PlotZoomer( QWidget *);

    virtual ~PlotZoomer() override = default;

    void keepAspectratio(bool doKeep)
    {
        _keep_aspect_ratio = doKeep;
    }

protected:
    virtual void widgetMousePressEvent( QMouseEvent * event)  override;
    virtual void widgetMouseReleaseEvent( QMouseEvent * event) override;
    virtual void widgetMouseMoveEvent( QMouseEvent * event) override;
    virtual bool accept( QPolygon & ) const override;

    virtual void zoom( const QRectF &rect ) override;

    virtual QSizeF minZoomSize() const override;
private:
    bool _mouse_pressed;
    bool _zoom_enabled;
    bool _keep_aspect_ratio;
    QPoint _initial_pos;
};

#endif // PLOTZOOMER_H