source: ntrip/trunk/BNC/qwtpolar/qwt_polar_magnifier.h@ 7976

/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * QwtPolar Widget Library
 * Copyright (C) 2008   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_POLAR_MAGNIFIER_H
#define QWT_POLAR_MAGNIFIER_H 1

#include "qwt_polar_global.h"
#include "qwt_magnifier.h"

class QwtPolarPlot;
class QwtPolarCanvas;

/*!
  \brief QwtPolarMagnifier 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 QwtPolarPanner it is possible to implement
  an individual navigation of the plot canvas.

  \sa QwtPolarPanner, QwtPolarPlot, QwtPolarCanvas
*/

class QWT_POLAR_EXPORT QwtPolarMagnifier: public QwtMagnifier
{
    Q_OBJECT

public:
    explicit QwtPolarMagnifier( QwtPolarCanvas * );
    virtual ~QwtPolarMagnifier();

    void setUnzoomKey( int key, int modifiers );
    void getUnzoomKey( int &key, int &modifiers ) const;

    QwtPolarPlot *plot();
    const QwtPolarPlot *plot() const;

    QwtPolarCanvas *canvas();
    const QwtPolarCanvas *canvas() const;

protected:
    virtual void rescale( double factor );
    void unzoom();

    virtual void widgetKeyPressEvent( QKeyEvent * );

private:
    class PrivateData;
    PrivateData *d_data;
};

#endif