svcore  1.9
ZoomConstraint.h
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00001 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
00002 
00003 /*
00004     Sonic Visualiser
00005     An audio file viewer and annotation editor.
00006     Centre for Digital Music, Queen Mary, University of London.
00007     This file copyright 2006 Chris Cannam.
00008     
00009     This program is free software; you can redistribute it and/or
00010     modify it under the terms of the GNU General Public License as
00011     published by the Free Software Foundation; either version 2 of the
00012     License, or (at your option) any later version.  See the file
00013     COPYING included with this distribution for more information.
00014 */
00015 
00016 #ifndef _ZOOM_CONSTRAINT_H_
00017 #define _ZOOM_CONSTRAINT_H_
00018 
00019 #include <stdlib.h>
00020 
00030 class ZoomConstraint
00031 {
00032 public:
00033     virtual ~ZoomConstraint() { }
00034 
00035     enum RoundingDirection {
00036         RoundDown,
00037         RoundUp,
00038         RoundNearest
00039     };
00040 
00051     virtual int getNearestBlockSize(int requestedBlockSize,
00052                                        RoundingDirection = RoundNearest)
00053         const
00054     {
00055         if (requestedBlockSize > getMaxZoomLevel()) return getMaxZoomLevel();
00056         else return requestedBlockSize;
00057     }
00058 
00062     virtual int getMaxZoomLevel() const { return 262144; }
00063 };
00064 
00065 #endif
00066