view layer/VerticalScaleLayer.h @ 1551:e79731086b0f

Fixes to NoteLayer, particularly to calculation of vertical scale when model unit is not Hz. To avoid inconsistency we now behave as if the unit is always Hz from the point of view of the external API and display, converting at the point where we obtain values from the events themselves. Also various fixes to editing.

/* -*- 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 2006-2013 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 VERTICAL_SCALE_LAYER_H
#define VERTICAL_SCALE_LAYER_H

/**
 * Interface for layers in which the Y axis represents (or can
 * sometimes represent, depending on the display mode) the sample
 * value. For example, TimeValueLayer uses vertical scale when in
 * point mode and so provides this interface.
 */
class VerticalScaleLayer
{
public:
    virtual int getYForValue(LayerGeometryProvider *, double value) const = 0;
    virtual double getValueForY(LayerGeometryProvider *, int y) const = 0;
    virtual QString getScaleUnits() const = 0;
};

#endif