Re: Implementing reliable cross-staff stems
On Dec 30, 2011, at 11:47 PM, Pavel Roskin wrote: Hello! I'm trying to implement cross-staff stems that would not get disconnected when the distance between staves changes. Ideally, I need a function that would extend the stem from the note in the lower staff exactly until it meets the stem of the note on the staff above. As a simpler solution, I want the stem length to be as long as the distance between staves plus or minus a constant. Since I need both the context and the particular note, I decided to go with the \applyOutput approach and filter out non-stems. That's where I got so far: #(define (longerstem grob grob-origin context) (if (memq 'stem-interface (ly:grob-interfaces grob)) (set! (ly:grob-property grob 'length) (cdr (assoc 'Y-extent (ly:context-grob-definition context 'VerticalAlignment)) \applyOutput #'Voice #longerstem c4 I get this in the output: programming error: no pure Y common refpoint Does anyone have an idea how to deal with it? You can use Scheme engravers. I use them for exactly this sorta thing. input/regression/scheme-engraver.ly in the source code for LilyPond (you can google this file to find it on a few servers). Cheers, MS ___ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
Re: Implementing reliable cross-staff stems
Quoting m...@apollinemike.com m...@apollinemike.com: You can use Scheme engravers. I use them for exactly this sorta thing. input/regression/scheme-engraver.ly in the source code for LilyPond (you can google this file to find it on a few servers). Thank you for your reply! Frankly, I don't understand a thing in that file. I guess I need to learn Scheme for real rather than rely on the bits in Lilypond documentation. But it's good to know of a place where I can look for ideas. I didn't want to delve inside Lilypond sources, as I only wanted to rely on documented interfaces. The test suite may lie somewhere in between, so maybe I'll find some ideas there. Speaking of my problem, it looks like I need to find the grob for the pianostaff. The pianostaff context doesn't seem to have information about the actual layout of the staves in a particular place. -- Regards, Pavel Roskin ___ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
Implementing reliable cross-staff stems
Hello! I'm trying to implement cross-staff stems that would not get disconnected when the distance between staves changes. Ideally, I need a function that would extend the stem from the note in the lower staff exactly until it meets the stem of the note on the staff above. As a simpler solution, I want the stem length to be as long as the distance between staves plus or minus a constant. Since I need both the context and the particular note, I decided to go with the \applyOutput approach and filter out non-stems. That's where I got so far: #(define (longerstem grob grob-origin context) (if (memq 'stem-interface (ly:grob-interfaces grob)) (set! (ly:grob-property grob 'length) (cdr (assoc 'Y-extent (ly:context-grob-definition context 'VerticalAlignment)) \applyOutput #'Voice #longerstem c4 I get this in the output: programming error: no pure Y common refpoint Does anyone have an idea how to deal with it? -- Regards, Pavel Roskin ___ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
