Issue 120 in mingus: chromatic intervals

[min...@googlecode.com]

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Labels: Type-Defect Priority-Medium

New issue 120 by OrtalisM...@gmail.com: chromatic intervals
http://code.google.com/p/mingus/issues/detail?id=120

I have a suggestion for the addition of chromatic intervals to
mingus.core.intervals (to allow for chromaticism within a key):

Diminished intervals:
Diminished First (d1) Negative one half step (ex. C to B)
Diminished Second (d2) Zero half steps (the same note; ex. D to D)
Diminished Third (d3) Two half steps (ex. G# to Bb)
Diminished Fourth (d4) Four half steps (ex. C# to F)
Diminished Fifth (d5) Six half steps (ex. D to Ab)
Diminished Sixth (d6) Seven half steps (ex. C to Abb)
Diminished Seventh (d7) Nine half steps (ex. D to Cb)
Diminished Eighth (d8) Eleven half steps (ex. C to Cb)

Augmented intervals:
Augmented First (A1) One half steps (ex. C to C#)
Augmented Second (A2) Three half steps (ex. F to G#)
Augmented Third (A3) Five half steps (ex. E to Gx)
Augmented Fourth (A4) Six half steps (ex. D to G#)
Augmented Fifth (A5) Eight half steps (ex. C to G#)
Augmented Sixth (A6) Ten half steps (ex. G to E#)
Augmented Seventh (A7) Twelve half steps (ex. E to Dx)
Augmented Eighth (A8) Thirteen half steps (ex. F to F#)

And, to be thorough, perhaps even:
If the octave is kept track of.
Perfect intervals:
Perfect Unison(P1) Zero half (ex. C-4 to C-4)
Perfect Octave(P8) Thirteen half steps (ex. C-4 to C-5)

If you are open to it, I'd very much like to contribute. I have a BM in
music theory from SFSU and am in my final term studying computer science at
CSU Chico. Since this is a fairly simple issue could I try to work on this
for you? Thank you.

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[min...@googlecode.com]

Comment #1 on issue 120 by OrtalisM...@gmail.com: chromatic intervals
http://code.google.com/p/mingus/issues/detail?id=120

I looked at the intervals.py file and I see now that you have functions for
major and minor unisons, fourths and fifths. I think perfect intervals
(unisons, fourths, fifths, octaves) are generally considered to be made
diminished (rather than minor) when making the interval a half-step less
and augmented (rather than major) when making the interval a half-step
more. There may be some different naming conventions, but I think many
users (such as myself) would be expecting diminished and augmented in place
of minor and major in these cases.

In any case, some of these other chromatic intervals are without functions.

[min...@googlecode.com]

Comment #2 on issue 120 by OrtalisM...@gmail.com: chromatic intervals
http://code.google.com/p/mingus/issues/detail?id=120

I have made some changes to intervals.py to fix the issues above,
particularly that perfect intervals may be made diminished or augmented not
minor and major, I've also added doubly diminished, doubly augmented. Other
additions are diminished and augmented for all other intervals and
redundant functions of first and unison intervals of all qualities since
people might use either name - although I would think only a perfect unison
would be referred to as a unison, and all others would be firsts. I have
also modified determine() to reflect these interval names (particularly for
perfect intervals).

If possible, I would like to officially contribute this file.

Attachments:
intervals.py 17.7 KB