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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
Sonic Visualiser
An audio file viewer and annotation editor.
Centre for Digital Music, Queen Mary, University of London.
This file copyright 2006-2018 Chris Cannam and QMUL.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version. See the file
COPYING included with this distribution for more information.
*/
#ifndef SV_HORIZONTAL_SCALE_PROVIDER_H
#define SV_HORIZONTAL_SCALE_PROVIDER_H
namespace sv {
class LayerGeometryProvider;
/**
* Interface to be implemented by objects, such as layers or objects
* they delegate to, in which the X axis corresponds to frequency. For
* example, SpectrumLayer.
*/
class HorizontalScaleProvider
{
public:
virtual ~HorizontalScaleProvider() { }
virtual double getFrequencyForX(const LayerGeometryProvider *,
double x)
const = 0;
virtual double getXForFrequency(const LayerGeometryProvider *,
double freq)
const = 0;
};
} // end namespace sv
#endif
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