qwt_abstract_scale.h

QWT5.01用于Qt开发的二维图形库程序

/* -*- 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_ABSTRACT_SCALE_H
#define QWT_ABSTRACT_SCALE_H

#include "qwt_global.h"

class QwtScaleEngine;
class QwtAbstractScaleDraw;
class QwtScaleDiv;
class QwtScaleMap;
class QwtDoubleInterval;

/*!
  \brief An abstract base class for classes containing a scale 

  QwtAbstractScale is used to provide classes with a QwtScaleDraw, 
  and a QwtScaleDiv. The QwtScaleDiv might be set explicitely 
  or calculated by a QwtScaleEngine.
*/

class QWT_EXPORT QwtAbstractScale
{
public:
    QwtAbstractScale();
    virtual ~QwtAbstractScale();
    
    void setScale(double vmin, double vmax, double step = 0.0);
    void setScale(const QwtDoubleInterval &, double step = 0.0);
    void setScale(const QwtScaleDiv &s);

    void setAutoScale();
    bool autoScale() const;

    void setScaleMaxMajor( int ticks);
    int scaleMaxMinor() const;

    void setScaleMaxMinor( int ticks);
    int scaleMaxMajor() const; 

    void setScaleEngine(QwtScaleEngine *);
    const QwtScaleEngine *scaleEngine() const;
    QwtScaleEngine *scaleEngine();

    const QwtScaleMap &scaleMap() const;
    
protected:
    void rescale(double vmin, double vmax, double step = 0.0);

    void setAbstractScaleDraw(QwtAbstractScaleDraw *);
    const QwtAbstractScaleDraw *abstractScaleDraw() const;
    QwtAbstractScaleDraw *abstractScaleDraw();

    virtual void scaleChange();

private:
    void updateScaleDraw();

    class PrivateData;
    PrivateData *d_data;
};

#endif