Comment #7 on issue 1056 by n.puttock: Pure-height of stems does not
accurately estimate height
http://code.google.com/p/lilypond/issues/detail?id=1056
The 'transparent property doesn't change the extent; try the following file
if you
don't believe me. :)
\relative c' {
\voiceTwo
\override Stem #'after-line-breaking =
#(lambda (grob)
(ly:message "Height: ~S Pure height: ~S"
(ly:stem::height grob)
(ly:stem::pure-height grob 0 0)))
a4
\override Stem #'transparent = ##t
a4
}
The only difference is that the stencil expression in the transparent case
is an
empty list; the extent remains the same.
In you invisible.ly snippet, you've also overriden 'length; that's what's
responsible
for the discrepancy between height/pure-height. If you look at the code in
Stem::pure_height (), it calls calc_length () directly, which bypasses the
callback
for 'length if it's set to a number. An improvement would be to check the
property
data first: if it's a number, then the user has explicitly set 'length;
otherwise
it's safe to call calc_length ().
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