svcore
1.9
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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