/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *****************************************************************************/

#ifndef QWT_PLOT_MAGNIFIER_H
#define QWT_PLOT_MAGNIFIER_H 1

#include "qwt_global.h"
#include "qwt_magnifier.h"

class QwtPlotCanvas;
class QwtPlot;

/*!
  \brief QwtPlotMagnifier provides zooming, by magnifying in steps.

  Using QwtPlotMagnifier a plot can be zoomed in/out in steps using
  keys, the mouse wheel or moving a mouse button in vertical direction.

  Together with QwtPlotZoomer and QwtPlotPanner it is possible to implement
  individual and powerful navigation of the plot canvas.

  \sa QwtPlotZoomer, QwtPlotPanner, QwtPlot
*/
class QWT_EXPORT QwtPlotMagnifier: public QwtMagnifier
{
    Q_OBJECT

public:
    explicit QwtPlotMagnifier(QwtPlotCanvas *);
    virtual ~QwtPlotMagnifier();

    void setAxisEnabled(int axis, bool on);
    bool isAxisEnabled(int axis) const;

    QwtPlotCanvas *canvas();
    const QwtPlotCanvas *canvas() const;

    QwtPlot *plot();
    const QwtPlot *plot() const;

protected:
    virtual void rescale(double factor);

private:
    class PrivateData;
    PrivateData *d_data;
};

#endif
