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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 2006-2018 Chris Cannam and 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 SV_HORIZONTAL_SCALE_PROVIDER_H
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17 #define SV_HORIZONTAL_SCALE_PROVIDER_H
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18
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19 class LayerGeometryProvider;
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20
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21 /**
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22 * Interface to be implemented by objects, such as layers or objects
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23 * they delegate to, in which the X axis corresponds to frequency. For
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24 * example, SpectrumLayer.
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25 */
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26 class HorizontalScaleProvider
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27 {
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28 public:
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29 virtual double getFrequencyForX(const LayerGeometryProvider *,
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30 double x)
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31 const = 0;
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32
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33 virtual double getXForFrequency(const LayerGeometryProvider *,
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34 double freq)
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35 const = 0;
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36 };
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37
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38 #endif
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