SemiTone Effect_ToneChanged_affect(SemiTone tone, Time time, int delta, CaretMode mode, MusicTrack track)
{
if (mode.HasFlag(CaretMode.Absolute))
{
return(new SemiTone(delta));
}
else if (!mode.HasFlag(CaretMode.Delta))
{
throw new InvalidOperationException();
}
if (mode.HasFlag(CaretMode.SemiTones))
{
tone += delta;
}
else if (mode.HasFlag(CaretMode.WholeTones))
{
var keysig =
track
.Adornment
.KeySignatures
.Intersecting(time)
.First()
.Value;
if (delta > 0)
{
while (delta-- > 0)
{
tone = keysig.Right(tone);
}
}
else if (delta < 0)
{
while (delta++ < 0)
{
tone = keysig.Left(tone);
}
}
}
else
{
throw new InvalidOperationException();
}
return(tone);
}
