File: tempomap.cpp

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musescore2 2.3.2%2Bdfsg3-11~bpo9%2B1
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//=============================================================================
//  MuseScore
//  Music Composition & Notation
//
//  Copyright (C) 2007-2011 Werner Schweer
//
//  This program is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License version 2
//  as published by the Free Software Foundation and appearing in
//  the file LICENCE.GPL
//=============================================================================

#include "tempomap.h"

//---------------------------------------------------------
//   tempo
//---------------------------------------------------------

double TempoMap::tempo(int tick) const
      {
      if (empty())
            return 2.0;
      auto i = lower_bound(tick);
      if (i == end()) {
            --i;
            return i->second;
            }
      if (i->first == tick)
            return i->second;
      if (i == begin())
            return 2.0;
      return i->second;
      }

//---------------------------------------------------------
//   time2tick
//---------------------------------------------------------

int TempoMap::time2tick(double val, double relTempo, int division) const
      {
      double time  = 0;
      int tick    = 0;
      double tempoDiv = division * relTempo;

      double tempo = 2.0;
      for (auto e = begin(); e != end(); ++e) {
            int delta    = e->first - tick;
            double time2 = time + double(delta) / (tempoDiv * tempo);
            if (val > time2)
                  break;
            tick  = e->first;
            tempo = e->second;
            time  = time2;
            }
      return tick +  (val - time) * tempoDiv * tempo;
      }