/// <summary>
/// Fill _timeAtGrid, index in range [from, to], assuming constant BPM (bpm) starting from referenceIdx
/// </summary>
private void SetTimeAtGrid(int from, int to, double bpm, int referenceIdx)
{
var secondsPerSignature = DirectorHelper.BpmToSeconds(bpm);
for (int i = from; i <= to; ++i)
{
var numGrids = i - referenceIdx;
_timeAtGrid[i] = _timeAtGrid[referenceIdx] + numGrids * secondsPerSignature / GridPerSignature;
}
}
private void UpdateTimeLength()
{
var length = 0.0;
Note lastBpmNote = null;
_timeAtGrid = new double[TotalGridCount];
_timeAtGrid[0] = StartTime;
// find all BpmNotes and compute the length between them
foreach (var note in Notes)
{
if (note.Type != NoteType.VariantBpm)
{
continue;
}
if (lastBpmNote == null)
{
// length between start and first BpmNote
length += DirectorHelper.BpmToSeconds(StartBpm) * note.IndexInGrid / GridPerSignature;
SetTimeAtGrid(1, note.IndexInGrid, StartBpm, 0);
}
else
{
// length between prev BpmNote and current
var deltaGridCount = note.IndexInGrid - lastBpmNote.IndexInGrid;
length += DirectorHelper.BpmToSeconds(lastBpmNote.ExtraParams.NewBpm) * deltaGridCount / GridPerSignature;
SetTimeAtGrid(lastBpmNote.IndexInGrid + 1, note.IndexInGrid, lastBpmNote.ExtraParams.NewBpm, lastBpmNote.IndexInGrid);
}
lastBpmNote = note;
}
// length from the last BpmNote to end
// if it's null, there is no BpmNote in the bar
if (lastBpmNote != null)
{
length += DirectorHelper.BpmToSeconds(lastBpmNote.ExtraParams.NewBpm) * (TotalGridCount - lastBpmNote.IndexInGrid) / GridPerSignature;
SetTimeAtGrid(lastBpmNote.IndexInGrid + 1, TotalGridCount - 1, lastBpmNote.ExtraParams.NewBpm, lastBpmNote.IndexInGrid);
}
else
{
length = DirectorHelper.BpmToSeconds(StartBpm) * Signature;
for (int i = 0; i < TotalGridCount; ++i)
{
_timeAtGrid[i] = StartTime + length * i / TotalGridCount;
}
}
TimeLength = length;
}
private static double CalculateTimingPeriodBetweenNotes(List <DelesteBeatmapEntry> entries, DelesteBasicNote currentBasicFlickNote, DelesteBasicNote lastBasicFlickNote, int fullLength)
{
double timeDiff;
double timePerBeat;
DelesteBeatmapEntry entry;
if (currentBasicFlickNote.Entry.MeasureIndex != lastBasicFlickNote.Entry.MeasureIndex)
{
var startIndex = entries.IndexOf(lastBasicFlickNote.Entry);
var endIndex = entries.IndexOf(currentBasicFlickNote.Entry, startIndex + 1);
entry = lastBasicFlickNote.Entry;
timePerBeat = DirectorHelper.BpmToSeconds(entry.BPM);
timeDiff = timePerBeat * entry.Signature * (1 - (float)lastBasicFlickNote.IndexInMeasure / lastBasicFlickNote.Entry.FullLength);
for (var i = startIndex + 1; i < endIndex; ++i)
{
entry = entries[i];
if (entry.IsCommand)
{
continue;
}
timePerBeat = DirectorHelper.BpmToSeconds(entry.BPM);
timeDiff += timePerBeat * entry.Signature;
}
entry = currentBasicFlickNote.Entry;
timePerBeat = DirectorHelper.BpmToSeconds(entry.BPM);
timeDiff += timePerBeat * entry.Signature * ((float)currentBasicFlickNote.IndexInMeasure / fullLength);
}
else
{
entry = currentBasicFlickNote.Entry;
timePerBeat = DirectorHelper.BpmToSeconds(entry.BPM);
timeDiff = timePerBeat * entry.Signature * ((float)currentBasicFlickNote.IndexInMeasure / fullLength - (float)lastBasicFlickNote.IndexInMeasure / lastBasicFlickNote.Entry.FullLength);
}
return(timeDiff);
}