qwt_transform.h

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/******************************************************************************
 * 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_TRANSFORM_H
#define QWT_TRANSFORM_H
 
#include "qwt_global.h"
 
class QWT_EXPORT QwtTransform
{
  public:
    QwtTransform();
    virtual ~QwtTransform();
 
    virtual double bounded( double value ) const;
 
    virtual double transform( double value ) const = 0;
 
    virtual double invTransform( double value ) const = 0;
 
    virtual QwtTransform* copy() const = 0;
 
  private:
    Q_DISABLE_COPY(QwtTransform)
};
 
class QWT_EXPORT QwtNullTransform : public QwtTransform
{
  public:
    QwtNullTransform();
    virtual ~QwtNullTransform();
 
    virtual double transform( double value ) const QWT_OVERRIDE;
    virtual double invTransform( double value ) const QWT_OVERRIDE;
 
    virtual QwtTransform* copy() const QWT_OVERRIDE;
};
class QWT_EXPORT QwtLogTransform : public QwtTransform
{
  public:
    QwtLogTransform();
    virtual ~QwtLogTransform();
 
    virtual double transform( double value ) const QWT_OVERRIDE;
    virtual double invTransform( double value ) const QWT_OVERRIDE;
 
    virtual double bounded( double value ) const QWT_OVERRIDE;
 
    virtual QwtTransform* copy() const QWT_OVERRIDE;
 
    static const double LogMin;
    static const double LogMax;
};
 
class QWT_EXPORT QwtPowerTransform : public QwtTransform
{
  public:
    explicit QwtPowerTransform( double exponent );
    virtual ~QwtPowerTransform();
 
    virtual double transform( double value ) const QWT_OVERRIDE;
    virtual double invTransform( double value ) const QWT_OVERRIDE;
 
    virtual QwtTransform* copy() const QWT_OVERRIDE;
 
  private:
    const double m_exponent;
};
 
#endif