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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 #ifndef _RANGE_MAPPER_H_
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17 #define _RANGE_MAPPER_H_
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18
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19 #include <QString>
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20
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21 #include "Debug.h"
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22
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23
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24 class RangeMapper
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25 {
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26 public:
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27 virtual ~RangeMapper() { }
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28 virtual int getPositionForValue(float value) const = 0;
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29 virtual float getValueForPosition(int position) const = 0;
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30 virtual QString getUnit() const { return ""; }
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31 };
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32
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33
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34 class LinearRangeMapper : public RangeMapper
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35 {
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36 public:
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37 /**
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38 * Map values in range minval->maxval linearly into integer range
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39 * minpos->maxpos. minval and minpos must be less than maxval and
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40 * maxpos respectively. If inverted is true, the range will be
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41 * mapped "backwards" (minval to maxpos and maxval to minpos).
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42 */
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43 LinearRangeMapper(int minpos, int maxpos,
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44 float minval, float maxval,
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45 QString unit = "", bool inverted = false);
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46
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47 virtual int getPositionForValue(float value) const;
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48 virtual float getValueForPosition(int position) const;
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49
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50 virtual QString getUnit() const { return m_unit; }
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51
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52 protected:
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53 int m_minpos;
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54 int m_maxpos;
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55 float m_minval;
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56 float m_maxval;
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57 QString m_unit;
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58 bool m_inverted;
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59 };
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60
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61
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62 class LogRangeMapper : public RangeMapper
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63 {
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64 public:
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65 LogRangeMapper(int minpos, int maxpos,
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66 float minval, float maxval,
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67 QString m_unit = "", bool inverted = false);
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68
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69 static void convertRatioMinLog(float ratio, float minlog,
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70 int minpos, int maxpos,
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71 float &minval, float &maxval);
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72
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73 static void convertMinMax(int minpos, int maxpos,
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74 float minval, float maxval,
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75 float &ratio, float &minlog);
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76
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77 virtual int getPositionForValue(float value) const;
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78 virtual float getValueForPosition(int position) const;
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79
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80 virtual QString getUnit() const { return m_unit; }
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81
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82 protected:
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83 int m_minpos;
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84 int m_maxpos;
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85 float m_ratio;
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86 float m_minlog;
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87 float m_maxlog;
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88 QString m_unit;
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89 bool m_inverted;
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90 };
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91
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92
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93 #endif
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