private static int GetStepValue(Pitch aStep)
{
int value = aStep.Alter;
value += aStep.Octave * 12;
switch (aStep.Step)
{
case 'C':
return value;
case 'D':
return value + 2;
case 'E':
return value + 4;
case 'F':
return value + 5;
case 'G':
return value + 7;
case 'A':
return value + 9;
case 'B':
return value + 11;
default:
throw new Exception("invalid pitch value");
}
}
private static int GetDelta(Pitch lastPitch, Pitch pitch)
{
return GetStepValue(pitch) - GetStepValue(lastPitch);
}