annotate base/LogRange.cpp @ 249:d3ac9f953ebf
* Fix #1672407 confused by plugin-named files in cwd (or home?)
* Fix #1491848 crash when loading new file while transform plugin runs
* Fix #1502287 Background remains black after spectrogram layer deleted
* Fix #1604477 Replacing the main audio file silences secondary audio file
* Fix failure to initialise property box layout to last preference on startup
* Fix resample/wrong-rate display in Pane, ensure that right rate is chosen
if all current models have an acceptable rate even if previous main model
had a different one
* Fix "global zoom" broken in previous commit
* Some fixes to spectrogram cache area updating (makes spectrogram appear
more quickly, previously it had a tendency to refresh with empty space)
* Fixes to colour 3d plot normalization
author |
Chris Cannam |
date |
Thu, 08 Mar 2007 16:53:08 +0000 |
parents |
8ff1ad4e7a9c |
children |
2268963dabd1 |
rev |
line source |
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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 Chris Cannam.
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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 "LogRange.h"
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17
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18 #include <algorithm>
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19 #include <cmath>
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20
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21 void
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22 LogRange::mapRange(float &min, float &max, float logthresh)
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23 {
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24 if (min > max) std::swap(min, max);
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25 if (max == min) max = min + 1;
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26
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27 if (min >= 0.f) {
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28
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29 max = log10f(max); // we know max != 0
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30
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31 if (min == 0.f) min = std::min(logthresh, max);
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32 else min = log10f(min);
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33
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34 } else if (max <= 0.f) {
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35
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36 min = log10f(-min); // we know min != 0
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37
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38 if (max == 0.f) max = std::min(logthresh, min);
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39 else max = log10f(-max);
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40
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41 std::swap(min, max);
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42
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43 } else {
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44
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45 // min < 0 and max > 0
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46
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47 max = log10f(std::max(max, -min));
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48 min = std::min(logthresh, max);
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49 }
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50
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51 if (min == max) min = max - 1;
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52 }
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53
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54 float
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55 LogRange::map(float value, float thresh)
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56 {
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57 if (value == 0.f) return thresh;
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58 return log10f(fabsf(value));
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59 }
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60
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