60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
//=============================================================================
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// MuseScore
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// Music Composition & Notation
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//
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// Copyright (C) 2007-2011 Werner Schweer
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License version 2
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// as published by the Free Software Foundation and appearing in
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// the file LICENCE.GPL
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//=============================================================================
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#include "tempomap.h"
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//---------------------------------------------------------
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// tempo
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//---------------------------------------------------------
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double TempoMap::tempo(int tick) const
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{
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if (empty()) {
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return 2.0;
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}
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auto i = lower_bound(tick);
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if (i == end()) {
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--i;
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return i->second;
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}
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if (i->first == tick) {
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return i->second;
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}
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if (i == begin()) {
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return 2.0;
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}
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return i->second;
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}
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//---------------------------------------------------------
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// time2tick
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//---------------------------------------------------------
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int TempoMap::time2tick(double val, double relTempo, int division) const
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{
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double time = 0;
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int tick = 0;
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double tempoDiv = division * relTempo;
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double tempo = 2.0;
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for (auto e = begin(); e != end(); ++e) {
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int delta = e->first - tick;
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double time2 = time + double(delta) / (tempoDiv * tempo);
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if (val > time2) {
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break;
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}
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tick = e->first;
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tempo = e->second;
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time = time2;
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}
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return tick + (val - time) * tempoDiv * tempo;
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}
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