Chris@189: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@189: 
Chris@189: /*
Chris@189:     Sonic Visualiser
Chris@189:     An audio file viewer and annotation editor.
Chris@189:     Centre for Digital Music, Queen Mary, University of London.
Chris@202:     This file copyright 2006 QMUL.
Chris@189:     
Chris@189:     This program is free software; you can redistribute it and/or
Chris@189:     modify it under the terms of the GNU General Public License as
Chris@189:     published by the Free Software Foundation; either version 2 of the
Chris@189:     License, or (at your option) any later version.  See the file
Chris@189:     COPYING included with this distribution for more information.
Chris@189: */
Chris@189: 
Chris@189: #include "RangeMapper.h"
Chris@189: 
Chris@189: #include <cassert>
Chris@189: #include <cmath>
Chris@189: 
Chris@189: #include <iostream>
Chris@189: 
Chris@189: LinearRangeMapper::LinearRangeMapper(int minpos, int maxpos,
Chris@189: 				     float minval, float maxval,
Chris@189:                                      QString unit) :
Chris@189:     m_minpos(minpos),
Chris@189:     m_maxpos(maxpos),
Chris@189:     m_minval(minval),
Chris@189:     m_maxval(maxval),
Chris@189:     m_unit(unit)
Chris@189: {
Chris@189:     assert(m_maxval != m_minval);
Chris@189:     assert(m_maxpos != m_minpos);
Chris@189: }
Chris@189: 
Chris@189: int
Chris@189: LinearRangeMapper::getPositionForValue(float value) const
Chris@189: {
Chris@190:     int position = m_minpos +
Chris@190:         lrintf(((value - m_minval) / (m_maxval - m_minval))
Chris@190:                * (m_maxpos - m_minpos));
Chris@189:     if (position < m_minpos) position = m_minpos;
Chris@189:     if (position > m_maxpos) position = m_maxpos;
Chris@241: //    std::cerr << "LinearRangeMapper::getPositionForValue: " << value << " -> "
Chris@241: //              << position << " (minpos " << m_minpos << ", maxpos " << m_maxpos << ", minval " << m_minval << ", maxval " << m_maxval << ")" << std::endl;
Chris@189:     return position;
Chris@189: }
Chris@189: 
Chris@189: float
Chris@189: LinearRangeMapper::getValueForPosition(int position) const
Chris@189: {
Chris@190:     float value = m_minval +
Chris@190:         ((float(position - m_minpos) / float(m_maxpos - m_minpos))
Chris@190:          * (m_maxval - m_minval));
Chris@189:     if (value < m_minval) value = m_minval;
Chris@189:     if (value > m_maxval) value = m_maxval;
Chris@241: //    std::cerr << "LinearRangeMapper::getValueForPosition: " << position << " -> "
Chris@241: //              << value << " (minpos " << m_minpos << ", maxpos " << m_maxpos << ", minval " << m_minval << ", maxval " << m_maxval << ")" << std::endl;
Chris@189:     return value;
Chris@189: }
Chris@189: 
Chris@189: LogRangeMapper::LogRangeMapper(int minpos, int maxpos,
Chris@189:                                float ratio, float minlog,
Chris@189:                                QString unit) :
Chris@189:     m_minpos(minpos),
Chris@189:     m_maxpos(maxpos),
Chris@190:     m_ratio(ratio),
Chris@189:     m_minlog(minlog),
Chris@189:     m_unit(unit)
Chris@189: {
Chris@189:     assert(m_maxpos != m_minpos);
Chris@189: 
Chris@189:     m_maxlog = (m_maxpos - m_minpos) / m_ratio + m_minlog;
Chris@189: }
Chris@189: 
Chris@189: int
Chris@189: LogRangeMapper::getPositionForValue(float value) const
Chris@189: {
Chris@189:     float mapped = m_ratio * log10(value);
Chris@189:     int position = lrintf(((mapped - m_minlog) / (m_maxlog - m_minlog))
Chris@189:                           * (m_maxpos - m_minpos));
Chris@189:     if (position < m_minpos) position = m_minpos;
Chris@189:     if (position > m_maxpos) position = m_maxpos;
Chris@241: //    std::cerr << "LogRangeMapper::getPositionForValue: " << value << " -> "
Chris@241: //              << position << " (minpos " << m_minpos << ", maxpos " << m_maxpos << ", ratio " << m_ratio << ", minlog " << m_minlog << ")" << std::endl;
Chris@189:     return position;
Chris@189: }
Chris@189: 
Chris@189: float
Chris@189: LogRangeMapper::getValueForPosition(int position) const
Chris@189: {
Chris@189:     float value = powf(10, (position - m_minpos) / m_ratio + m_minlog);
Chris@241: //    std::cerr << "LogRangeMapper::getValueForPosition: " << position << " -> "
Chris@241: //              << value << " (minpos " << m_minpos << ", maxpos " << m_maxpos << ", ratio " << m_ratio << ", minlog " << m_minlog << ")" << std::endl;
Chris@189:     return value;
Chris@189: }
Chris@189: