Hi Jan-Peter,
Am 12.12.2017 um 14:15 schrieb Jan-Peter Voigt:
Hi Urs,
as you already said units are only known inside the paper block,
because they are dependent of the paper size an the global staff size.
Inside the paper block the units are just numbers. If you want to
multiply numbers you can do so outside the paper block like this:
xx = 2
yy = 3\xx
#(display yy) % will display '6'
One idea might be to store pairs or lists with the number and the unit
name as a symbol. Inside the paper block a scheme-function can
retrieve the unit factor and multiply it with the given value.
A rough sketch is attached.
Thank you. While I had to figure out how to adapt this to 2.18 I
realized that the missing information was that I can turn the symbol
"cm" into a value through ly:parser-lookup.
This works with 2.18, and I will further refine it (the idea is to store
several sets of paper variables and select a set with a single function:
\version "2.18"
#(define paper-values
'((top-margin . (5 . cm))
(indent . (4 . cm))))
paperValue =
#(define-scheme-function (parser location val)(symbol?)
(let*
((entry (assoc-ref paper-values val))
(unit (ly:parser-lookup parser (cdr entry))))
(* unit (car entry))))
\paper {
indent = \paperValue #'indent
top-margin = \paperValue #'top-margin
}
\relative { bes' a c b }
Best
Urs
HTH
Jan-Peter
Am 12.12.2017 um 11:40 schrieb Urs Liska:
Hi,
I would like to parametrize my paper settings. But for that I need to
either store the measurement unit in a variable (outside the paper
block) or store the plain number in the variable and create a length
from that within the paper block.
tm = 5\in
\paper {
top-margin = #tm
}
This doesn't work because LilyPond doesn't recognize the "\in" in the
toplevel variable definition.
And rather than using the LilyPond syntax I would need to store the
settings in an alist like
values =
#'((top-margin . 5)
(bottom-margin . 2.5))
etc. and retrieve those values in the paper definition.
So I need to either store the numbers together with their unit (so I
can directly use them in the paper block) or have a way to "create"
that variable from the stored number within the paper block.
Any pointers appreciated
Urs
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