view base/RangeMapper.cpp @ 490:c3fb8258e34d

* Make it possible to import an entire session from an RDF document.
  However, at the moment the timings of events appear to be constrained
  by how far the audio decoder has got through its audio file at the
  time the event is queried -- need to investigate.

/* -*- 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.
*/

#include "RangeMapper.h"

#include <cassert>
#include <cmath>

#include <iostream>

LinearRangeMapper::LinearRangeMapper(int minpos, int maxpos,
				     float minval, float maxval,
                                     QString unit, bool inverted) :
    m_minpos(minpos),
    m_maxpos(maxpos),
    m_minval(minval),
    m_maxval(maxval),
    m_unit(unit),
    m_inverted(inverted)
{
    assert(m_maxval != m_minval);
    assert(m_maxpos != m_minpos);
}

int
LinearRangeMapper::getPositionForValue(float value) const
{
    int position = m_minpos +
        lrintf(((value - m_minval) / (m_maxval - m_minval))
               * (m_maxpos - m_minpos));
    if (position < m_minpos) position = m_minpos;
    if (position > m_maxpos) position = m_maxpos;
//    std::cerr << "LinearRangeMapper::getPositionForValue: " << value << " -> "
//              << position << " (minpos " << m_minpos << ", maxpos " << m_maxpos << ", minval " << m_minval << ", maxval " << m_maxval << ")" << std::endl;
    if (m_inverted) return m_maxpos - position;
    else return position;
}

float
LinearRangeMapper::getValueForPosition(int position) const
{
    if (m_inverted) position = m_maxpos - position;
    float value = m_minval +
        ((float(position - m_minpos) / float(m_maxpos - m_minpos))
         * (m_maxval - m_minval));
    if (value < m_minval) value = m_minval;
    if (value > m_maxval) value = m_maxval;
//    std::cerr << "LinearRangeMapper::getValueForPosition: " << position << " -> "
//              << value << " (minpos " << m_minpos << ", maxpos " << m_maxpos << ", minval " << m_minval << ", maxval " << m_maxval << ")" << std::endl;
    return value;
}

LogRangeMapper::LogRangeMapper(int minpos, int maxpos,
                               float minval, float maxval,
                               QString unit, bool inverted) :
    m_minpos(minpos),
    m_maxpos(maxpos),
    m_unit(unit),
    m_inverted(inverted)
{
    convertMinMax(minpos, maxpos, minval, maxval, m_minlog, m_ratio);

    std::cerr << "LogRangeMapper: minpos " << minpos << ", maxpos "
              << maxpos << ", minval " << minval << ", maxval "
              << maxval << ", minlog " << m_minlog << ", ratio " << m_ratio
              << ", unit " << unit.toStdString() << std::endl;

    assert(m_maxpos != m_minpos);

    m_maxlog = (m_maxpos - m_minpos) / m_ratio + m_minlog;
}

void
LogRangeMapper::convertMinMax(int minpos, int maxpos,
                              float minval, float maxval,
                              float &minlog, float &ratio)
{
    static float thresh = powf(10, -10);
    if (minval < thresh) minval = thresh;
    minlog = log10f(minval);
    ratio = (maxpos - minpos) / (log10f(maxval) - minlog);
}

void
LogRangeMapper::convertRatioMinLog(float ratio, float minlog,
                                   int minpos, int maxpos,
                                   float &minval, float &maxval)
{
    minval = powf(10, minlog);
    maxval = powf(10, (maxpos - minpos) / ratio + minlog);
}

int
LogRangeMapper::getPositionForValue(float value) const
{
    int position = (log10(value) - m_minlog) * m_ratio + m_minpos;
    if (position < m_minpos) position = m_minpos;
    if (position > m_maxpos) position = m_maxpos;
//    std::cerr << "LogRangeMapper::getPositionForValue: " << value << " -> "
//              << position << " (minpos " << m_minpos << ", maxpos " << m_maxpos << ", ratio " << m_ratio << ", minlog " << m_minlog << ")" << std::endl;
    if (m_inverted) return m_maxpos - position;
    else return position;
}

float
LogRangeMapper::getValueForPosition(int position) const
{
    if (m_inverted) position = m_maxpos - position;
    float value = powf(10, (position - m_minpos) / m_ratio + m_minlog);
//    std::cerr << "LogRangeMapper::getValueForPosition: " << position << " -> "
//              << value << " (minpos " << m_minpos << ", maxpos " << m_maxpos << ", ratio " << m_ratio << ", minlog " << m_minlog << ")" << std::endl;
    return value;
}