/// <summary>
/// Gets the distance between the played frequency to the open note by percentage.
/// </summary>
/// <param name="twoClosestOpenNotes">The two closest open notes to the frequency.</param>
/// <param name="closestNote">The most closest note, out of the two closest notes,
/// which will be used as a reference to calculate the difference between this and the playedFrequency.</param>
/// <param name="playedFrequency">The note that the user hits translated to frequency [Hz].</param>
/// <returns>How close the users' frequency is from the desired note.</returns>
private NoteDifference CalculateRatioOfCloseness(UpperAndLowerNotes twoClosestOpenNotes, Note closestNote, Hz playedFrequency)
{
float closenessToMark; //Closeness to the exact note mark. Number between 0 and 1.
NoteDifference noteDiff = new NoteDifference();
//Represents how close the frequency is from the closestNote.
float difference = Math.Abs(playedFrequency - closestNote.Hertz);
float middleOfTwoOpenNotes = Math.Abs(twoClosestOpenNotes.Upper.Hertz - twoClosestOpenNotes.Lower.Hertz) / 2;
if (middleOfTwoOpenNotes != 0)
//Calculate the closness to the closestNote.
closenessToMark = difference / middleOfTwoOpenNotes; //FIX: Why is that?
else
closenessToMark = difference;
//Calculate the alpha (opacity) of the note indicator.
//noteDiff.ClosnessAlpha = NoteDifference.FULL_ALPHA - closenessToMark;
//Calculate the closness by a precentage of base 90.
noteDiff.ClosnessByPercentage_Base90 = closenessToMark * 90; //FIX: This is not a precentage!
noteDiff.ClosestNote = closestNote.Name;
if (playedFrequency < closestNote.Hertz)
{
//from -90 to 0 degrees.
noteDiff.ClosnessByPercentage_Base90 *= (-1);
//if (closestNote.Alias != null)
// noteDiff.ClosestNote = closestNote.Alias;
}
return noteDiff;
}
/// <summary>
/// Finds the two closest open chord notes (as shown at NoteFrequencyFilter description)
/// of the played frequency.
/// </summary>
/// <param name="playedFrequency">The frequency the user played.</param>
/// <returns>Returns the two closest open chord notes,
/// unless the playedFrequency is above the highest open string frequency,
/// or below the lowest open string frequency,
/// in that case it will return the same value for both.</returns>
private UpperAndLowerNotes GetTwoClosestOpenNotes(Hz playedFrequency)
{
UpperAndLowerNotes twoClosestOpenNotes = new UpperAndLowerNotes(Notes.LowerLimit, Notes.UpperLimit);
if (playedFrequency <= OpenStringNotes.E2.Hertz)
{
twoClosestOpenNotes.Lower = Notes.LowerLimit;
twoClosestOpenNotes.Upper = OpenStringNotes.E2;
}
else if (playedFrequency > OpenStringNotes.E2.Hertz && playedFrequency <= OpenStringNotes.A2.Hertz)
{
twoClosestOpenNotes.Lower = OpenStringNotes.E2;
twoClosestOpenNotes.Upper = OpenStringNotes.A2;
}
else if (playedFrequency > OpenStringNotes.A2.Hertz && playedFrequency <= OpenStringNotes.D3.Hertz)
{
twoClosestOpenNotes.Lower = OpenStringNotes.A2;
twoClosestOpenNotes.Upper = OpenStringNotes.D3;
}
else if (playedFrequency > OpenStringNotes.D3.Hertz && playedFrequency <= OpenStringNotes.G3.Hertz)
{
twoClosestOpenNotes.Lower = OpenStringNotes.D3;
twoClosestOpenNotes.Upper = OpenStringNotes.G3;
}
else if (playedFrequency > OpenStringNotes.G3.Hertz && playedFrequency <= OpenStringNotes.B3.Hertz)
{
twoClosestOpenNotes.Lower = OpenStringNotes.G3;
twoClosestOpenNotes.Upper = OpenStringNotes.B3;
}
else if (playedFrequency > OpenStringNotes.B3.Hertz && playedFrequency <= OpenStringNotes.E4.Hertz)
{
twoClosestOpenNotes.Lower = OpenStringNotes.B3;
twoClosestOpenNotes.Upper = OpenStringNotes.E4;
}
else if (playedFrequency > OpenStringNotes.E4.Hertz)
{
twoClosestOpenNotes.Lower = OpenStringNotes.E4;
twoClosestOpenNotes.Upper = Notes.UpperLimit;
}
return twoClosestOpenNotes;
}
/// <summary>
/// Find the single open note which is closest to the frequency.
/// </summary>
/// <param name="twoClosestOpenNotes">The two open notes that the frequency is between them.</param>
/// <param name="frequency">The given frequency.</param>
/// <returns>Retruns the main note that is being tuned to.</returns>
private Note FindClosestOpenNote(UpperAndLowerNotes twoClosestOpenNotes, Hz frequency)
{
if ((twoClosestOpenNotes.Upper.Hertz - frequency) < (frequency - twoClosestOpenNotes.Lower.Hertz))
return twoClosestOpenNotes.Upper;
else
return twoClosestOpenNotes.Lower;
}
