public static IEnumerable <RhythmicDuration> Parse(params int[] durations)
{
return(durations.Select(i =>
{
var denominatorAsPowerOfTwo = UsefulMath.Log2(i);
return new RhythmicDuration(denominatorAsPowerOfTwo);
}).ToArray());
}
/// <summary>
/// Tunes this Pitch to TunedPitch using a specific standard pitch and a specific tuning system.
/// </summary>
/// <param name="standardPitch">Standard pitch (i.e. A4 = 440 Hz, etc.)</param>
/// <param name="tuningSystem"></param>
/// <returns>Pitch with assigned frequency</returns>
public TunedPitch Tune(TunedPitch standardPitch, TuningSystem tuningSystem)
{
var logarythmicProportion = tuningSystem.AllIntervalRatios[new BoundInterval(standardPitch, this)];
var freq = standardPitch.Frequency * UsefulMath.CentsToLinear(logarythmicProportion);
freq *= (this.Octave - standardPitch.Octave) + 1;
return(new TunedPitch(this, freq));
}
public static bool TryParse(string s, out RhythmicDuration duration)
{
int val;
if (!int.TryParse(s, out val))
{
duration = default(RhythmicDuration);
return(false);
}
var denominatorAsPowerOfTwo = UsefulMath.Log2(val);
duration = new RhythmicDuration(denominatorAsPowerOfTwo);
return(true);
}
/// <summary>
/// Parses RhythmicDuration from a string
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
public static RhythmicDuration Parse(string s)
{
var numberOfDots = s.ToCharArray().Count(c => c == '.');
int denominator;
if (!int.TryParse(s.Replace(".", ""), out denominator))
{
throw new Exception("Could not parse string. Unrecognized duration.");
}
var denominatorAsPowerOfTwo = UsefulMath.Log2(denominator);
return(new RhythmicDuration(denominatorAsPowerOfTwo, numberOfDots));
}
/// <summary>
/// Converts cents value to approximated proportion.
/// </summary>
/// <param name="cents"></param>
/// <param name="precision"></param>
/// <returns></returns>
public static Proportion GetApproximatedProportionFromCents(double cents, int precision = 6)
{
if (precision < 1 || precision > 20)
{
throw new ArgumentException("Precision must be between 1 and 20.", "precision");
}
var decimalValue = UsefulMath.CentsToLinear(cents);
var normalizedValue = decimalValue;
var denominator = 1;
var maxDenominator = Math.Pow(10, precision);
while (normalizedValue % 10 != 0 && denominator <= maxDenominator)
{
denominator *= 10;
normalizedValue *= 10;
}
return(new Proportion((int)normalizedValue, denominator).Normalize());
}
