Here are some things I tried to make breve and longer rests hang both in
RhythmicStaff (different line count) and in TabStaff (different staff-space):
* translate up by (staff-space - 1) → works for TabStaff (staff-space = 1.5)
and Staff (staff-space = 1, so no visible change) but fails for different
fontsize
* translate by (staff-space - fontsize) in brew_internal_stencil → dots are
offset
* translate by (staff-space - fontsize) in y_offset_callback →
Staff_symbol_referencer::get_position gives non-integer values → computing
whether ledgered breve should be chosen in TabStaff fails, breve dots are offset
* change the font so that the glyphs hang from the base-line → not SMuFL
compliant (according to [this part of the
specification](https://w3c.github.io/smufl/gitbook/specification/scoring-metrics-glyph-registration.html)
only semibreve rests should hang), would need a change in all other fonts made
for LilyPond
And one thing I didn’t try:
* don’t use glyphs from the font but draw rectangles and ledger lines with
Lookup::round_filled_box or similar commands → fonts cannot specify width of
the rests, widths would only come from Rest.style or another grob property.
Are there other ideas how to use the glyphs from the font?
---
** [issues:#5258] Vertical breve rest position in TabStaff/RhythmicStaff**
**Status:** Started
**Created:** Sat Jan 13, 2018 04:47 PM UTC by Malte Meyn
**Last Updated:** Mon Jan 15, 2018 07:25 AM UTC
**Owner:** Malte Meyn
**Attachments:**
-
[breve_rests.png](https://sourceforge.net/p/testlilyissues/issues/5258/attachment/breve_rests.png)
(26.0 kB; image/png)
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[gould_breve_rests_oneline.png](https://sourceforge.net/p/testlilyissues/issues/5258/attachment/gould_breve_rests_oneline.png)
(27.9 kB; image/png)
According to Gould breve rests should hang from a one line staff
(RhythmicStaff) as semibreve rests do. Also, there is a comment in
multi-measure-rest.cc saying
```
// Staff position is somewhat icky regarding its definition for
// compatibility reasons. It is intended to be the baseline of
// a breve rest. However, when the staff space is more than
// single space (like with tablature), it looks better if all
// rests are actually hanging. So staff position, in reality,
// is the semi-breve position - 2. Everything else is
// calculated from there.
```
This confirms what Gould writes. But the code applies only to MMRs with a
measure-count > 1.
That leads to inconsistent behaviour: MultiMeasureRest breve glyphs hang, but
not for single measures. Rest breve glyphs don’t hang. Instead, all breve rests
should hang.
```
\version "2.19.80"
music = {
\compressFullBarRests
r1 R1 R\breve
\time 4/2
r\breve R\breve R\longa
\time 8/2
r\longa R\longa
}
\new TabStaff \with { \tabFullNotation } \music
\new RhythmicStaff \music
\new Staff \music
```
---
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