Mercurial > hg > svcore
view base/RangeMapper.cpp @ 747:523e97d0f6eb
Merge from branch "coreaudio_tests"
author | Chris Cannam |
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date | Mon, 03 Sep 2012 11:06:50 +0100 |
parents | 1424aa29ae95 |
children | e802e550a1f2 |
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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); std::cerr << "LogRangeMapper: minpos " << minpos << ", maxpos " << maxpos << ", minval " << minval << ", maxval " << maxval << ", minlog " << m_minlog << ", ratio " << m_ratio << ", unit " << unit << 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; // 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; }