/**
* Converts a Hertz value to relative cents. E.g. 440Hz is converted to 900 if the reference is a
* C.
*
* @param hertzValue A value in hertz.
* @return A value in relative cents.
*/
public static double hertzToRelativeCent(final double hertzValue) {
double absoluteCentValue = PitchUnit.hertzToAbsoluteCent(hertzValue);
// make absoluteCentValue positive. E.g. -2410 => 1210
if (absoluteCentValue < 0) {
absoluteCentValue = Math.abs(1200 + absoluteCentValue);
}
// so it can be folded to one octave. E.g. 1210 => 10
return absoluteCentValue % 1200.0;
}
/**
* Converts a Hertz value to pitch in this unit.
*
* @param hertzValue The value in Hertz.
* @return The pitch in this unit.
*/
private double convertHertz(final double hertzValue) {
final double convertedPitch;
switch (this) {
case ABSOLUTE_CENTS:
convertedPitch = PitchUnit.hertzToAbsoluteCent(hertzValue);
break;
case HERTZ:
convertedPitch = hertzValue;
break;
case MIDI_CENT:
convertedPitch = PitchUnit.hertzToMidiCent(hertzValue);
break;
case MIDI_KEY:
convertedPitch = PitchUnit.hertzToMidiKey(hertzValue);
break;
case RELATIVE_CENTS:
convertedPitch = PitchUnit.hertzToRelativeCent(hertzValue);
break;
default:
throw new AssertionError("Unknown pitch unit: " + getHumanName());
}
return convertedPitch;
}
