private static long ConvertFromTimeTime(MathTimeSpan mathTimeSpan, long time, TempoMap tempoMap)
{
var timeSpan1 = mathTimeSpan.TimeSpan1;
var timeSpan2 = mathTimeSpan.TimeSpan2;
// Ensure that the first time span is not an instance of the MathTimeSpan. If it is,
// convert it to the type of its first time span. For example, if we the following
// time span was passed to the method:
//
// (a1 + b1) + c
//
// the time span will be transformed to:
//
// a2 + c
var timeSpan1AsMath = mathTimeSpan.TimeSpan1 as MathTimeSpan;
if (timeSpan1AsMath != null)
{
timeSpan1 = TimeSpanConverter.ConvertTo(timeSpan1AsMath, timeSpan1AsMath.TimeSpan1.GetType(), time, tempoMap);
}
// To subtract one time from another one we need to convert the second time span
// to the type of the first one. After that result of subtraction will be of the
// first time span type. And finally we convert result time span according to the
// specified time. For example, time span shown above will be transformed first to
//
// a3
//
// and then will be converted to MIDI time.
switch (mathTimeSpan.Operation)
{
case MathOperation.Subtract:
{
var convertedTimeSpan2 = TimeConverter.ConvertTo(timeSpan2, timeSpan1.GetType(), tempoMap);
return(TimeSpanConverter.ConvertFrom(timeSpan1.Subtract(convertedTimeSpan2, TimeSpanMode.TimeTime), time, tempoMap));
}
default:
throw new ArgumentException($"{mathTimeSpan.Operation} is not supported by the converter.", nameof(mathTimeSpan));
}
}
private static long ConvertFromTimeLength(MathTimeSpan mathTimeSpan, long time, TempoMap tempoMap)
{
var convertedTimeSpan1 = TimeConverter.ConvertFrom(mathTimeSpan.TimeSpan1, tempoMap);
switch (mathTimeSpan.Operation)
{
case MathOperation.Add:
return(convertedTimeSpan1 + LengthConverter.ConvertFrom(mathTimeSpan.TimeSpan2,
convertedTimeSpan1,
tempoMap));
case MathOperation.Subtract:
return(convertedTimeSpan1 - LengthConverter.ConvertFrom(mathTimeSpan.TimeSpan2,
convertedTimeSpan1,
tempoMap.Flip(convertedTimeSpan1)));
default:
throw new ArgumentException($"{mathTimeSpan.Operation} is not supported by the converter.", nameof(mathTimeSpan));
}
}
