Class Diatonic

mingus/core/scales.py:152–181

The diatonic scale. Example: >>> print Diatonic('C', (3, 7)) Ascending: C D E F G A B C Descending: C B A G F E D C

class Diatonic(_Scale):

    """The diatonic scale.

    Example:
    >>> print Diatonic('C', (3, 7))
    Ascending:  C D E F G A B C
    Descending: C B A G F E D C
    """

    type = "diatonic"

    def __init__(self, note, semitones, octaves=1):
        """Create the diatonic scale starting on the chosen note.

        The second parameter is a tuple representing the position of
        semitones.
        """
        super(Diatonic, self).__init__(note, octaves)
        self.semitones = semitones
        self.name = "{0} diatonic, semitones in {1}".format(self.tonic, self.semitones)

    def ascending(self):
        notes = [self.tonic]
        for n in range(1, 7):
            if n in self.semitones:
                notes.append(intervals.minor_second(notes[-1]))
            else:
                notes.append(intervals.major_second(notes[-1]))
        return notes * self.octaves + [notes[0]]


# Ancient scales