Mercurial > hg > svcore
view base/RangeMapper.cpp @ 283:7336fe3a7caa
* Fix failure to properly load from text files with old-style Mac line endings
author | Chris Cannam |
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date | Thu, 09 Aug 2007 10:06:02 +0000 |
parents | 2b40f83e7627 |
children | db8fcd280234 6f6ab834449d |
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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 <cassert> #include <cmath> #include <iostream> LinearRangeMapper::LinearRangeMapper(int minpos, int maxpos, float minval, float maxval, QString unit) : m_minpos(minpos), m_maxpos(maxpos), m_minval(minval), m_maxval(maxval), m_unit(unit) { 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; return position; } float LinearRangeMapper::getValueForPosition(int position) const { 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 ratio, float minlog, QString unit) : m_minpos(minpos), m_maxpos(maxpos), m_ratio(ratio), m_minlog(minlog), m_unit(unit) { assert(m_maxpos != m_minpos); m_maxlog = (m_maxpos - m_minpos) / m_ratio + m_minlog; } int LogRangeMapper::getPositionForValue(float value) const { float mapped = m_ratio * log10(value); int position = lrintf(((mapped - m_minlog) / (m_maxlog - m_minlog)) * (m_maxpos - 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; return position; } float LogRangeMapper::getValueForPosition(int position) const { 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; }