On 2021-01-06 6:41 pm, Andrew Bernard wrote:
If staff height is 20 points, then what is the staff space size? Maybe
I am overthinking this but suddenly I thought there may be some factor
of including or not including the staff lines in the measurement. It
is not immediately apparent to me where staff space is defined in the
NR.
Somebody help out my overworked brain!
All the best to all for 2021.
If you are open to looking at the code, see
layout-set-absolute-staff-size-in-module in paper.scm.
The default staff size is indeed 20pt. For a standard 5-live staff
symbol, the staff height is 4 staff spaces. As such, a staff space is
then by default 5pt. Note that this is not the actual space between ink
rather it is the distance between staff lines *on center*. The actual
whitespace measurement would then be the staff space less the staff line
thickness.
Line thickness is computed based on a linear interpolation. From a
comment in feta-params.mf, the line thickness measured from reference
scores was generally 0.5pt irrespective of staff size; however, it was
determined that smaller staff sizes in LilyPond should use a little less
ink. For the default staff space of 5pt, then line thickness is exactly
0.5pt. However, as staff space drops to 4.125pt, line thickness should
only reduce to 0.47pt.
-- Aaron Hill
