Subject: abjad.Meter.rewrite() rewritting of chords tied to notes

[Davi Raubach]

Hi everyone,

I've encountered a bug in abjad.Meter.rewrite() specifically when a Chord is tied to a Note (or vice versa) and the meter grid forces a rhythmic split.

I have been facing similar issues when writing chords where only specific notes are tied (I am currently composing for pipe organ).

Abjad docs modified example:

import abjad

string = "| 2/4 c'2 ~ |"
string += "| 4/4 c'32 d'2.. ~ <d' f'>16 e'32 ~ |"
string += "| 2/4 e'2 |"
container = abjad.parsers.reduced.parse_reduced_ly_syntax(string)
staff = abjad.Staff()
staff[:] = container
print(abjad.lilypond(staff))
string = "(4/4 ((2/4 (1/4 1/4)) (2/4 (1/4 1/4))))"
rtc = abjad.rhythmtrees.parse(string)[0]
meter = abjad.Meter(rtc)
meter.rewrite(staff[1][:])
print(abjad.lilypond(staff))

Output:

\new Staff
{
    {
        %%% \time 2/4 %%%
        c'2
        ~
    }
    {
        %%% \time 4/4 %%%
        c'32
        d'2..
        ~
        <d' f'>16
        e'32
        ~
    }
    {
        %%% \time 2/4 %%%
        e'2
    }
}
\new Staff
{
    {
        %%% \time 2/4 %%%
        c'2
        ~
    }
    {
        %%% \time 4/4 %%%
        c'32
        d'4...
        ~
        d'4...
        e'32
        ~
    }
    {
        %%% \time 2/4 %%%
        e'2
    }
}

Expected output: 

\new Staff
{
    {
        \time 2/4 %%%
        c'2
        ~
    }
    {
        \time 4/4 %%%
        c'32
        d'4...
        ~

        d'4. ~
     d'32 ~
        <d' f'>16
     e'32
        ~
    }
    {
        \time 2/4 %%%
        e'2
    }
}

Is this a known limitation in how LogicalTie handles chords tied to single notes and vice-versa?

Best regards, 

Davi

[Trevor Bača]

Hi Davi,

I'm pretty sure this is a limitation in Abjad: I think Abjad assumes by default that all the notes or chords in a logical tie are "the same." That assumption probably doesn't cause any problem adding ties to notes or chords, but it doesn't surprise me that it breaks meter rewriting: presumably the entire duration of the logical tie is taken to be equal to the note which appears as the first element in the logical tie.

Hope you'll be able to find a workaround,

Trevor.

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Trevor Bača

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