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