Mercurial > hg > svcore
view base/RangeMapper.cpp @ 875:3e6ed8a8577b tonioni
Use a sparse time-value model only for outputs with fixed bin count of 1, not for those with unknown bin count.
(Precursor to using more than one model for outputs with unknown bin count)
author | Chris Cannam |
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date | Tue, 28 Jan 2014 18:52:22 +0000 |
parents | e802e550a1f2 |
children | eb6b6a88faed |
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/* -*- 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 "system/System.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; // SVDEBUG << "LinearRangeMapper::getPositionForValue: " << value << " -> " // << position << " (minpos " << m_minpos << ", maxpos " << m_maxpos << ", minval " << m_minval << ", maxval " << m_maxval << ")" << 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; // SVDEBUG << "LinearRangeMapper::getValueForPosition: " << position << " -> " // << value << " (minpos " << m_minpos << ", maxpos " << m_maxpos << ", minval " << m_minval << ", maxval " << m_maxval << ")" << 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); cerr << "LogRangeMapper: minpos " << minpos << ", maxpos " << maxpos << ", minval " << minval << ", maxval " << maxval << ", minlog " << m_minlog << ", ratio " << m_ratio << ", unit " << unit << 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; // SVDEBUG << "LogRangeMapper::getPositionForValue: " << value << " -> " // << position << " (minpos " << m_minpos << ", maxpos " << m_maxpos << ", ratio " << m_ratio << ", minlog " << m_minlog << ")" << 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); // SVDEBUG << "LogRangeMapper::getValueForPosition: " << position << " -> " // << value << " (minpos " << m_minpos << ", maxpos " << m_maxpos << ", ratio " << m_ratio << ", minlog " << m_minlog << ")" << endl; return value; }