Re: repeat tremolo - warning message

[Thomas Morley]

2015-02-15 16:56 GMT+01:00 Phil Holmes <address@hidden>:
> http://code.google.com/p/lilypond/issues/detail?id=1444
>
> --
> Phil Holmes
>
>
>
> ----- Original Message -----
> From: MING TSANG
> To: address@hidden
> Sent: Sunday, February 15, 2015 2:48 PM
> Subject: repeat tremolo - warning message
>
> lily ponders,
>
> I ran the following lily code and got a warning message.
> The first and 2nd \repeat tremolo are the same except the pitch.
> (1)  Why the second \repeat tremolo return a warning message.?
> (2)  How can I adjust the \repeat tremolo so that it display in the middle
> of two pitches - ie slanted upwards toward the high note?
> I have problem to attach .png, lilypond-user rejected my email saying it is
> too big.
>
> Immanuel,
> Ming
>
> %% lily code starts ....
> \version "2.19.15"
> \language "english"
> si = { \time 4/4
> <c'c''>2 e'16 g' a' c'' g' a' c'' d'' |%m52
> \override Beam.gap = #2
> \repeat tremolo 8 { e'' e''' } |%m53 <-28
> \repeat tremolo 8 { b' b''} |%m54 <-29
> \repeat tremolo 4 { a' a''} <g'g''>4 a''8 g'' |\break%m55 <-30
> }
> ai = { \clef bass
> c8 g c' d' c'4 g |%m52
> c8 g c' d' e'4 c' |%m53
> e8 b e' b g'4 e' |%m54
> f8 c' f'4 <g d'f'>2 |%m55
> }
> \score {
> <<
> \new Staff \si
> \new Staff \ai
>>>
> \layout { }
> }
> %%lily code ends
>
> Warning message:
> 9:27   warning: weird stem size, check for narrow beams
> \repeat tremolo 8 { b'
> b''} |%m54 <-29


Hi,

please always try to boil down your code to a minimal example, like:

\version "2.19.15"
\repeat tremolo 8 { b'16 b'' }

Anyway, part of the problem are the Stems.
Yes, whole notes _do_ have a Stem in LilyPond. Look at the terminal-output of:

\relative c'' {
  \override Stem.after-line-breaking =
  #(lambda (grob) (newline) (format #t "\n\tStem found: ~a\n" grob))
  c1
}

In your use-case you can deal with it, setting stem-direction explecitely.
Though, overrides for 'gap and 'positions of Beam may trigger more
warnings, which can be surpressed as shown below:

\version "2.19.15"

%% The overrides for 'gap _and_ 'positions, both may trigger a warning,
%% depending on the used values
%% Uncomment one or both of the following lines to get rid of it
% #(ly:expect-warning (_ "weird stem size, check for narrow beams"))
% #(ly:expect-warning (_ "weird stem size, check for narrow beams"))

{
\override Beam.gap = #1.5 % a value of 2 will cause warnings
\override Beam.positions = #'(1.6 . 2.8)
\repeat tremolo 8 { \stemUp b'16 \stemDown b'' \stemNeutral }
}

HTH,
  Harm