ZoomConstraint.h

Go to the documentation of this file.

/* -*- 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 Chris Cannam.
    
    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 _ZOOM_CONSTRAINT_H_
#define _ZOOM_CONSTRAINT_H_

#include <stdlib.h>

class ZoomConstraint
{
public:
    virtual ~ZoomConstraint() { }

    enum RoundingDirection {
        RoundDown,
        RoundUp,
        RoundNearest
    };

    virtual int getNearestBlockSize(int requestedBlockSize,
                                       RoundingDirection = RoundNearest)
        const
    {
        if (requestedBlockSize > getMaxZoomLevel()) return getMaxZoomLevel();
        else return requestedBlockSize;
    }

    virtual int getMaxZoomLevel() const { return 262144; }
};

#endif