issue #1493: Problem with horizontal beams
file: lily/beam-quanting.cc
In spite of infinite damping, due to numeric precision problems
(rounding/adding) the resulting beams arbitrarily still had a
remaining non-zero slope, sometimes even in the "wrong" direction.
In good TeX manner and in line with concaveness (already implemented),
we'll use a threshold value of 10000 for forcing horizontal beams.
http://codereview.appspot.com/337560043
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** [issues:#1493] Problem with horizontal beams**
**Status:** Started
**Created:** Wed Jan 26, 2011 12:21 PM UTC by Anonymous
**Last Updated:** Sat Feb 10, 2018 12:08 PM UTC
**Owner:** Torsten Hämmerle
**Attachments:**
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[beams.ly](https://sourceforge.net/p/testlilyissues/issues/1493/attachment/beams.ly)
(807 Bytes; application/octet-stream)
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[screenshot.png](https://sourceforge.net/p/testlilyissues/issues/1493/attachment/screenshot.png)
(18.9 kB; image/png)
*Originally created by:* *anonymous
*Originally created by:*
[[email protected]](http://code.google.com/u/106131861630194758622/)
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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