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1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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2
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3 /*
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4 Sonic Visualiser
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5 An audio file viewer and annotation editor.
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6 Centre for Digital Music, Queen Mary, University of London.
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7 This file copyright 2006 QMUL.
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8
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9 This program is free software; you can redistribute it and/or
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10 modify it under the terms of the GNU General Public License as
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11 published by the Free Software Foundation; either version 2 of the
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12 License, or (at your option) any later version. See the file
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13 COPYING included with this distribution for more information.
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14 */
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15
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16 #include "RangeMapper.h"
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17 #include "system/System.h"
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18
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19 #include <cassert>
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20 #include <cmath>
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21
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22 #include <iostream>
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23
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24 LinearRangeMapper::LinearRangeMapper(int minpos, int maxpos,
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25 float minval, float maxval,
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26 QString unit, bool inverted) :
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27 m_minpos(minpos),
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28 m_maxpos(maxpos),
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29 m_minval(minval),
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30 m_maxval(maxval),
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31 m_unit(unit),
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32 m_inverted(inverted)
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33 {
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34 assert(m_maxval != m_minval);
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35 assert(m_maxpos != m_minpos);
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36 }
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37
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38 int
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39 LinearRangeMapper::getPositionForValue(float value) const
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40 {
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41 int position = m_minpos +
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42 lrintf(((value - m_minval) / (m_maxval - m_minval))
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43 * (m_maxpos - m_minpos));
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44 if (position < m_minpos) position = m_minpos;
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45 if (position > m_maxpos) position = m_maxpos;
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46 // DEBUG << "LinearRangeMapper::getPositionForValue: " << value << " -> "
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47 // << position << " (minpos " << m_minpos << ", maxpos " << m_maxpos << ", minval " << m_minval << ", maxval " << m_maxval << ")" << endl;
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48 if (m_inverted) return m_maxpos - position;
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49 else return position;
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50 }
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51
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52 float
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53 LinearRangeMapper::getValueForPosition(int position) const
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54 {
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55 if (m_inverted) position = m_maxpos - position;
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56 float value = m_minval +
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57 ((float(position - m_minpos) / float(m_maxpos - m_minpos))
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58 * (m_maxval - m_minval));
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59 if (value < m_minval) value = m_minval;
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60 if (value > m_maxval) value = m_maxval;
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61 // DEBUG << "LinearRangeMapper::getValueForPosition: " << position << " -> "
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62 // << value << " (minpos " << m_minpos << ", maxpos " << m_maxpos << ", minval " << m_minval << ", maxval " << m_maxval << ")" << endl;
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63 return value;
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64 }
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65
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66 LogRangeMapper::LogRangeMapper(int minpos, int maxpos,
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67 float minval, float maxval,
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68 QString unit, bool inverted) :
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69 m_minpos(minpos),
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70 m_maxpos(maxpos),
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71 m_unit(unit),
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72 m_inverted(inverted)
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73 {
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74 convertMinMax(minpos, maxpos, minval, maxval, m_minlog, m_ratio);
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75
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76 std::cerr << "LogRangeMapper: minpos " << minpos << ", maxpos "
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77 << maxpos << ", minval " << minval << ", maxval "
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78 << maxval << ", minlog " << m_minlog << ", ratio " << m_ratio
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79 << ", unit " << unit << std::endl;
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80
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81 assert(m_maxpos != m_minpos);
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82
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83 m_maxlog = (m_maxpos - m_minpos) / m_ratio + m_minlog;
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84 }
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85
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86 void
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87 LogRangeMapper::convertMinMax(int minpos, int maxpos,
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88 float minval, float maxval,
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89 float &minlog, float &ratio)
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90 {
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91 static float thresh = powf(10, -10);
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92 if (minval < thresh) minval = thresh;
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93 minlog = log10f(minval);
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94 ratio = (maxpos - minpos) / (log10f(maxval) - minlog);
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95 }
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96
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97 void
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98 LogRangeMapper::convertRatioMinLog(float ratio, float minlog,
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99 int minpos, int maxpos,
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100 float &minval, float &maxval)
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101 {
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102 minval = powf(10, minlog);
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103 maxval = powf(10, (maxpos - minpos) / ratio + minlog);
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104 }
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105
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106 int
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107 LogRangeMapper::getPositionForValue(float value) const
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108 {
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109 int position = (log10(value) - m_minlog) * m_ratio + m_minpos;
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110 if (position < m_minpos) position = m_minpos;
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111 if (position > m_maxpos) position = m_maxpos;
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112 // DEBUG << "LogRangeMapper::getPositionForValue: " << value << " -> "
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113 // << position << " (minpos " << m_minpos << ", maxpos " << m_maxpos << ", ratio " << m_ratio << ", minlog " << m_minlog << ")" << endl;
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114 if (m_inverted) return m_maxpos - position;
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115 else return position;
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116 }
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117
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118 float
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119 LogRangeMapper::getValueForPosition(int position) const
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120 {
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121 if (m_inverted) position = m_maxpos - position;
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122 float value = powf(10, (position - m_minpos) / m_ratio + m_minlog);
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123 // DEBUG << "LogRangeMapper::getValueForPosition: " << position << " -> "
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124 // << value << " (minpos " << m_minpos << ", maxpos " << m_maxpos << ", ratio " << m_ratio << ", minlog " << m_minlog << ")" << endl;
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125 return value;
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126 }
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127
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