Hello! The issue 2275 has "Patch-needs_work" now. I guess the needed work is asking some questions in the list, so that the documentation becomes easier to understand and the example would actually illustrate it.
This is the page I'm taking about: http://lilypond.org/doc/v2.15/Documentation/notation/unpure_002dpure-containers Quote: "When a function overrides a Y-offset and/or Y-extent it is assumed that this will trigger line breaking calculations too early during compilation. So the function is not evaluated at all" squareLineCircleSpace doesn't override Y-offset or Y-extent, yet the output is ugly. Why? Why do stems have to be hidden? Do they force calculations that would otherwise be delayed? Or do they reserve horizontal space that the noteheads with overridden stencil won't reserve? Why is this showing correct output? roundNotes = { \override NoteHead #'stencil = #(make-circle-stencil 0.5 0.1 #f) } smartRoundNotes = { \roundNotes \override NoteHead #'Y-extent = #(ly:make-unpure-pure-container ly:grob::stencil-height (lambda (grob start end) (ly:grob::stencil-height grob))) } \new Voice \relative c'' { \time 4/1 \roundNotes cis1 ces cisis c \smartRoundNotes cis1 ces cisis c } And why does the output break if roundNotes is rewritten with a lambda? roundNotes = { \override NoteHead #'stencil = #(lambda (grob) (make-circle-stencil 0.5 0.1 #f)) } What's so different between the above stencil definitions? Does Lilypond actually try to classify functions as pure and unpure by parsing them? -- Regards, Pavel Roskin _______________________________________________ lilypond-devel mailing list lilypond-devel@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-devel
