public BarIndexCalculator(int barTick, IEnumerable <TimeSignatureChangeEvent> events, bool hasPaddingBar)
{
this.hasPaddingBar = hasPaddingBar;
this.barTick = barTick;
var ordered = events.OrderBy(p => p.Tick).ToList();
var dic = new SortedDictionary <int, TimeSignatureItem>();
int pos = 0;
int barIndex = hasPaddingBar ? 1 : 0;
for (int i = 0; i < ordered.Count; i++)
{
var item = new TimeSignatureItem()
{
StartTick = pos,
StartBarIndex = barIndex,
TimeSignature = ordered[i]
};
// 時間逆順で追加
if (dic.ContainsKey(pos))
{
dic[-pos] = item;
}
else
{
dic.Add(-pos, item);
}
if (i < ordered.Count - 1)
{
int barLength = barTick * ordered[i].Numerator / ordered[i].Denominator;
int duration = ordered[i + 1].Tick - pos;
pos += duration / barLength * barLength;
barIndex += duration / barLength;
}
}
timeSignatures = dic;
}
/// <summary>
/// TicksPerBeatと拍子変更イベントから<see cref="BarIndexCalculator"/>のインスタンスを初期化します。
/// </summary>
/// <param name="ticksPerBeat">譜面のTicksPerBeat</param>
/// <param name="sigs">拍子変更イベントを表す<see cref="TimeSignatureChangeEvent"/>のリスト</param>
public BarIndexCalculator(int ticksPerBeat, IEnumerable <TimeSignatureChangeEvent> sigs)
{
TicksPerBeat = ticksPerBeat;
var ordered = sigs.OrderBy(p => p.Tick).ToList();
var dic = new SortedDictionary <int, TimeSignatureItem>();
int pos = 0;
int barIndex = 0;
for (int i = 0; i < ordered.Count; i++)
{
// 小節先頭に配置されていないイベント
if (pos != ordered[i].Tick)
{
throw new InvalidTimeSignatureException($"TimeSignatureChangeEvent does not align at the head of bars (Tick: {ordered[i].Tick}).", ordered[i].Tick);
}
var item = new TimeSignatureItem(barIndex, ordered[i]);
// 時間逆順で追加
if (dic.ContainsKey(-pos))
{
throw new InvalidTimeSignatureException($"TimeSignatureChangeEvents duplicated (Tick: {ordered[i].Tick}).", ordered[i].Tick);
}
else
{
dic.Add(-pos, item);
}
if (i < ordered.Count - 1)
{
int barLength = BarTick * ordered[i].Numerator / ordered[i].Denominator;
int duration = ordered[i + 1].Tick - pos;
pos += duration / barLength * barLength;
barIndex += duration / barLength;
}
}
ReversedTimeSignatures = dic.Values.ToList();
}
