[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] Ticket 1493 di

labels: Frog -->
Description has changed:

Diff:

status: Accepted --> Started
assigned_to: Torsten Hämmerle
Needs: -->
Patch: -->
Type: Enhancement --> Defect
Comment:

Changed to Type "Defect" because the coding clearly isn't working as intended for extreme values of damping and even (seemingly) random results occur.

More details to follow (about the LilyPond beam damping algorithm in general and unwanted side-effects in cases of extreme damping in particular).

Cheerio,
Torsten

[issues:#1493] Problem with horizontal beams

Status: Started
Created: Wed Jan 26, 2011 12:21 PM UTC by Anonymous
Last Updated: Wed Jan 26, 2011 12:21 PM UTC
Owner: Torsten Hämmerle
Attachments:

beams.ly (807 Bytes; application/octet-stream)
screenshot.png (18.9 kB; image/png)

Originally created by: *anonymous

Originally created by: address@hidden

James Lowe :
There seems to be an inconsistency with setting horizontal beams.

We have a snippet where we state that

\override Beam #'damping = #+inf.0

Should generate horizontal beams in all cases.

However the simple example attached shows some odd inconsistencies.

\version "2.13.40"

\relative c'' {
    \override Beam #'damping = #+inf.0
     f16 g a b    a c d g,    a b a c   d e f g, % all beams horizontal
     f16 g a b    a c d g,    a b a c   d e f g, % all beams horizontal
     f16 g a b    a c d g,    a b a c   d e f g, % 2nd and 4th group not Horizontal
     f16 g a b    a c d g,    a b a c   d e f g, % 2nd and 4th group not Horizontal
}

\relative c'' {
    \override Beam #'damping = #+inf.0
     f16 g a b    a c d g,    a b a c   d e f g, \break % 4th group not Horizontal
     f16 g a b    a c d g,    a b a c   d e f g, \break % 2nd and 4th group not Horizontal
     f16 g a b    a c d g,    a b a c   d e f g, \break % 2nd and 4th group not Horizontal
     f16 g a b    a c d g,    a b a c   d e f g, \break % 2nd and 4th group not Horizontal
}

Phil Holmes :

I'd suggest the snippet is worth sorting out, too. What do you reckon - adding the commands

\override Beam #'details #'damping-direction-penalty = #0
\override Beam #'details #'round-to-zero-slope = #0

to the existing snippet, or a new one pointed to by the old one, that says "if \override Beam #'damping = #+inf.0 doesn't do what you want, add the other commands too, as shown here"?

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From:	Auto mailings of changes to Lily Issues via Testlilyissues-auto
Subject:	[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] Ticket 1493 discussion
Date:	Mon, 15 Jan 2018 16:36:04 -0000