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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
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8 This program is free software; you can redistribute it and/or
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9 modify it under the terms of the GNU General Public License as
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10 published by the Free Software Foundation; either version 2 of the
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11 License, or (at your option) any later version. See the file
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12 COPYING included with this distribution for more information.
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13 */
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14
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15 #ifndef SV_ZOOM_LEVEL_H
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16 #define SV_ZOOM_LEVEL_H
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17
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18 #include <ostream>
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19 #include <cmath>
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20
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21 /** Display zoom level. Can be an integer number of samples per pixel,
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22 * or an integer number of pixels per sample.
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23 */
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24 struct ZoomLevel {
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25
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26 enum Zone {
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27 FramesPerPixel, // zoomed out (as in classic SV)
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28 PixelsPerFrame // zoomed in beyond 1-1 (interpolating the waveform)
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29 };
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30
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31 Zone zone;
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32 int level;
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33
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34 ZoomLevel() : zone(FramesPerPixel), level(1) { }
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35 ZoomLevel(Zone z, int lev) : zone(z), level(lev) { }
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36
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37 bool operator<(const ZoomLevel &other) const {
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38 if (zone == FramesPerPixel) {
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39 if (other.zone == zone) {
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40 return level < other.level;
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41 } else {
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42 return false;
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43 }
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44 } else {
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45 if (other.zone == zone) {
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46 return level > other.level;
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47 } else {
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48 return false;
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49 }
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50 }
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51 }
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52
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53 bool operator==(const ZoomLevel &other) const {
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54 return (zone == other.zone && level == other.level);
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55 }
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56
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57 ZoomLevel incremented() const {
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58 if (zone == FramesPerPixel) {
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59 return { zone, level + 1 };
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60 } else if (level == 1) {
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61 return { FramesPerPixel, 2 };
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62 } else if (level == 2) {
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63 return { FramesPerPixel, 1 };
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64 } else {
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65 return { zone, level - 1 };
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66 }
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67 }
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68
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69 ZoomLevel decremented() const {
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70 if (zone == PixelsPerFrame) {
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71 return { zone, level + 1 };
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72 } else if (level == 1) {
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73 return { PixelsPerFrame, 2 };
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74 } else {
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75 return { zone, level - 1 };
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76 }
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77 }
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78
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79 /** Inexact conversion. The result is a whole number if we are
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80 * zoomed in enough (in PixelsPerFrame zone), a fraction
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81 * otherwise.
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82 */
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83 double framesToPixels(double frames) const {
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84 if (zone == PixelsPerFrame) {
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85 return frames * level;
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86 } else {
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87 return frames / level;
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88 }
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89 }
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90
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91 /** Inexact conversion. The result is a whole number if we are
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92 * zoomed out enough (in FramesPerPixel zone), a fraction
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93 * otherwise.
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94 */
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95 double pixelsToFrames(double pixels) const {
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96 if (zone == PixelsPerFrame) {
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97 return pixels / level;
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98 } else {
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99 return pixels * level;
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100 }
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101 }
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102
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103 /** Return a ZoomLevel that approximates the given ratio of pixels
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104 * to frames.
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105 */
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106 static ZoomLevel fromRatio(int pixels, int frames) {
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107 if (pixels < frames) {
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108 return { FramesPerPixel, int(round(double(pixels)/frames)) };
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109 } else {
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110 int r = int(round(double(frames)/pixels));
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111 if (r > 1) {
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112 return { PixelsPerFrame, r };
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113 } else {
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114 return { FramesPerPixel, 1 };
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115 }
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116 }
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117 }
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118 };
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119
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120 std::ostream &operator<<(std::ostream &s, const ZoomLevel &z);
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121
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122 #endif
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