plotmagnifier.h

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#ifndef PLOTMAGNIFIER_H
#define PLOTMAGNIFIER_H

#include <QTimer>
#include "qwt_plot_magnifier.h"
#include "qwt_plot.h"
#include <QEvent>

class PlotMagnifier : public QwtPlotMagnifier
{
    Q_OBJECT

public:
    explicit PlotMagnifier( QWidget *canvas);
    virtual ~PlotMagnifier() override;

    void setAxisLimits(int axis,double lower, double upper);
    virtual void widgetWheelEvent( QWheelEvent *event ) override;

    enum AxisMode {X_AXIS, Y_AXIS, BOTH_AXES};

    virtual void rescale( double factor ) override
    {
        rescale( factor, _default_mode );
    }

    void setDefaultMode(AxisMode mode) { _default_mode = mode; }

    void rescale( double factor, AxisMode axis );
protected:

    virtual void widgetMousePressEvent( QMouseEvent* event ) override;

    double _lower_bounds[QwtPlot::axisCnt];
    double _upper_bounds[QwtPlot::axisCnt];

    QPointF _mouse_position;

signals:
    void rescaled(QRectF new_size);

private:
    QPointF invTransform(QPoint pos);
    QTimer _future_emit;
    AxisMode _default_mode;

};

#endif // PLOTMAGNIFIER_H