[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #5264 Left-handed fret-diagram nut alignment

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Oh, wait - there are obviously more problems than expected...
(landscape mode moves below the baseline, marginal objects (e.g. capo numbers) flip inside the diagram...

Probably we should gerneralize and rename this issue so that it is not only restricted to nut line alignment but generally handles effects caused by negative string-number values.

@Malte: As to the sign function, I'll drop a note at Rietveld.
@DAK: Thanks for the enlightenment and sorry for my naiveness - I'm working on it...

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[issues:#5264] Left-handed fret-diagram nut alignment

Status: Started
Created: Thu Jan 18, 2018 10:07 AM UTC by Torsten Hämmerle
Last Updated: Thu Jan 18, 2018 12:39 PM UTC
Owner: Malte Meyn
Attachments:

• reverse-fretboard-corner-fit.png (9.8 kB; image/png)

Ticket 5025 https://sourceforge.net/p/testlilyissues/issues/5025/ opened up the possibilty of reversing the order of strings by setting a negative string-distance:

\new FretBoards { 
  \chordmode { 
    \override FretBoard.fret-diagram-details.string-thickness-factor = #0.3
    c1 
    \override FretBoard.fret-diagram-details.string-distance = #-1 
   c1 
  } 
} 

Karlin High reported an unwanted side effect of negative string-distance values (see attached image):
The "nut" doesn't properly align with the outer edges of the fretboard.
Reason for misalignment: half-linethickness of the outer strings is effectively being subtracted rather than being added due to the negative sign introduced by the negative string-distance.

Cheerio,
Torsten

Related feature documentation: issue 5263 Document distance of strings and frets
https://sourceforge.net/p/testlilyissues/issues/5263/

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