Jonathan
The source for add-grace-property is in scm/music-functions.scm.
The function does not simply set a value in 'direction - it
appends an entry to a list.
At the head of the function is a TODO:
;; TODO: make a remove-grace-property too.
Looks like this has never been implemented.
Trevor
----- Original Message -----
From: "Jonathan Kulp" <[EMAIL PROTECTED]>
To: <lilypond-user@gnu.org>
Sent: Monday, August 11, 2008 5:07 PM
Subject: GDP: Rhythms: add-grace-property
I'm working on the Rhythms section of Notation Reference for GDP, and
I'm having trouble making "add-grace-property" work as described in this
passage from Notation Reference 1.2.6.1:
"The layout of grace expressions can be changed throughout the
music using the function @code{add-grace-property}. The following
example undefines the @code{Stem} direction for this grace, so
that stems do not always point up."
@example
\new Staff @{
#(add-grace-property 'Voice 'Stem 'direction '())
@dots{}
@}
@end example
Since we're trying to get rid of @example passages and use real musical
examples instead, I tried to make it work with music. Here's the code I
used and the non-fatal error message that followed.
\relative c'' {
\new Staff {
% #(add-grace-property 'Voice 'Stem 'direction #'down)
#(add-grace-property 'Voice 'Stem 'direction '())
\new Voice {
\acciaccatura {
f16
}
g4
}
}
}
Parsing...
Interpreting music...
Preprocessing graphical objects...
programming error: Stem dir must be up or down.
continuing, cross fingers
Finding the ideal number of pages...
So it looks like it won't accept '() as a valid argument. I tried using
#'() and it said "illegal empty combination"
The only way I could get it to change the stem direction was to replace
"'()" with "#'down" (commented out in the code above), but the whole
point of that example was to make the grace-note stems have no
predetermined direction.
Does anyone see what the problem is? I guess this is why we're removing
@example examples :)
Jon
--
Jonathan Kulp
http://www.jonathankulp.com
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