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List:       lilypond-bug
Subject:    Re: stem length in staff space
From:       James <pkx () gnu ! org>
Date:       2017-03-14 12:11:35
Message-ID: 63ebe817-37f0-305e-e430-0ac97d6b4c03 () gnu ! org
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Hello,


On 14/03/17 11:51, Thomas Morley wrote:
> 2017-03-14 12:18 GMT+01:00 Klaus Rettinghaus
> <klaus.rettinghaus@alumni.tu-berlin.de>:
>> Ok, here's another try:
>> (Version 2.19.56)
>>
>> {
>> \override NoteHead.transparent = ##t
>> e'
>> \tweak Stem.length #3 e'
>> \tweak Stem.length #6 e'
>> }
>>
>> The normal stem of an e' has the length of approximately 3 staff spaces. So
>> I tweak the stem length to 3 (staff spaces) to match the previous. But it
>> turns out to be only half as long. I have to tweak it to #6 to match a
>> length of 3 staff spaces.
>> Where I'am thinking wrong?
>>
>> Regards
>> Klaus
>
>
> I agree with Klaus, Stem.length is measured in half-staff-space, see
>
> {
> %% for convenience
>    \cadenzaOn
>    \hide NoteHead
>    \override NoteHead.stem-attachment = #'(0 . 0)
>
> %  \override Stem.after-line-breaking =
> %  #(lambda (grob)
> %    (format #t "\nstem-length-----------~a" (ly:grob-property grob 'length)))
>
>    e'4
>    \tweak Stem.length #0 e'
>    \tweak Stem.length #1 e'
>    \tweak Stem.length #2 e'
>    \tweak Stem.length #3 e'
>    \tweak Stem.length #4 e'
>    \tweak Stem.length #5 e'
>    \tweak Stem.length #6 e'
>    \tweak Stem.length #7 e'
> }
>
> The IR is generated automatically and I've found the length-property
> in lyric-syllable-interface as well. Where the description puzzles me
> even more.
> Though, no time to research further yet.
> Have to run for my regular job...
>
> Cheers,
>    Harm
>
>

Thanks Harm for another point of view, obviously I am not understanding 
this - as it looked like full staff spaces to me at first.

anyway I have created issue

https://sourceforge.net/p/testlilyissues/issues/5095/

It's set as a 'documentation' issue for now (assuming that the actual 
output is correct as it is coded).

Thanks for your patience Klaus.

James


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