annotate base/RangeMapper.h @ 316:3a6725f285d6

* Make RemoteFile far more pervasive, and use it for local files as well
  so that we can handle both transparently.  Make it shallow copy with
  reference counting, so it can be used by value without having to worry
  about the cache file lifetime.  Use RemoteFile for MainWindow file-open
  functions, etc

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2006 QMUL.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef _RANGE_MAPPER_H_
#define _RANGE_MAPPER_H_

#include <QString>


class RangeMapper 
{
public:
    virtual ~RangeMapper() { }
    virtual int getPositionForValue(float value) const = 0;
    virtual float getValueForPosition(int position) const = 0;
    virtual QString getUnit() const { return ""; }
};


class LinearRangeMapper : public RangeMapper
{
public:
    LinearRangeMapper(int minpos, int maxpos,
                      float minval, float maxval,
                      QString unit = "");
    
    virtual int getPositionForValue(float value) const;
    virtual float getValueForPosition(int position) const;

    virtual QString getUnit() const { return m_unit; }

protected:
    int m_minpos;
    int m_maxpos;
    float m_minval;
    float m_maxval;
    QString m_unit;
};


class LogRangeMapper : public RangeMapper
{
public:
    LogRangeMapper(int minpos, int maxpos,
                   float ratio, float minlog,
                   QString m_unit = "");

    virtual int getPositionForValue(float value) const;
    virtual float getValueForPosition(int position) const;

    virtual QString getUnit() const { return m_unit; }

protected:
    int m_minpos;
    int m_maxpos;
    float m_ratio;
    float m_minlog;
    float m_maxlog;
    QString m_unit;
};


#endif