Rewriting the Stem stencil using markup paths - Revision history

Lemzwerg: New category

2025-11-21T23:22:24Z

New category

← Older revision		Revision as of 23:22, 21 November 2025
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	[[Category:Scheme]]		[[Category:Scheme]]
	[[Category:Tweaks and overrides]]		[[Category:Tweaks and overrides]]
	[[Category:Rhythms]][[Category:Snippet]]		[[Category:Rhythms]]
			[[Category:Snippet]]

Lemzwerg at 22:59, 21 November 2025

2025-11-21T22:59:18Z

← Older revision		Revision as of 22:59, 21 November 2025
Line 56:		Line 56:
	[[Category:Scheme]]		[[Category:Scheme]]
	[[Category:Tweaks and overrides]]		[[Category:Tweaks and overrides]]
	[[Category:Rhythms]]		[[Category:Rhythms]][[Category:Snippet]]

Jean Abou Samra: Replace version="2.24.0" with version="2.24" now that the LilyWiki extension supports auto-selecting the latest release in a stable series

2025-11-16T18:53:46Z

Replace version="2.24.0" with version="2.24" now that the LilyWiki extension supports auto-selecting the latest release in a stable series

← Older revision		Revision as of 18:53, 16 November 2025
Line 1:		Line 1:
	This snippet rewrites <code>ly:stem::print</code> using a markup, which can be used as a base to create markup path stems. The example given produces stems shaped like bolts of lightning.		This snippet rewrites <code>ly:stem::print</code> using a markup, which can be used as a base to create markup path stems. The example given produces stems shaped like bolts of lightning.

	<lilypond version="2.24.0">		<lilypond version="2.24">
	%% http://lsr.di.unimi.it/LSR/Item?id=864		%% http://lsr.di.unimi.it/LSR/Item?id=864

Jean Abou Samra: Import snippet from LSR

2025-10-26T22:49:41Z

Import snippet from LSR

New page

This snippet rewrites <code>ly:stem::print</code> using a markup, which can be used as a base to create markup path stems. The example given produces stems shaped like bolts of lightning.

<lilypond version="2.24.0">
%% http://lsr.di.unimi.it/LSR/Item?id=864

% This has no visible effect, it just redoes the existing stem stencil.
% You can use this as a base.
#(define (path-stem grob)
(if (ly:stencil? (ly:stem::print grob))
(let* ((stencil (ly:stem::print grob))
(X-ext (ly:stencil-extent stencil X))
(Y-ext (ly:stencil-extent stencil Y))
(width (interval-length X-ext))
(len (interval-length Y-ext)))

(ly:stencil-translate
(grob-interpret-markup grob
(markup
(#:path width
(list (list 'moveto 0 0)
(list 'lineto 0 len)))))
(cons 0 (interval-start Y-ext))))
#f))

% This is an example of what can be done with the rewritten stencil.
#(define (lightning-stem grob)
(if (ly:stencil? (ly:stem::print grob))
(let* ((stencil (ly:stem::print grob))
(X-ext (ly:stencil-extent stencil X))
(Y-ext (ly:stencil-extent stencil Y))
(width (interval-length X-ext))
(len (interval-length Y-ext)))

(ly:stencil-translate
(grob-interpret-markup grob
(markup
(#:path width
(list (list 'moveto 0 0)
(list 'lineto (* len 0.1) (* len 0.6))
(list 'lineto (- (* len 0.1)) (* len 0.4))
(list 'lineto 0 len)))))
(cons 0 (interval-start Y-ext))))
#f))

\relative c' {
\override Stem.stencil = #path-stem
| c1
| c8 d8 e8 f8 g8 f8 e8 d8 c2 c2
\override Stem.stencil = #lightning-stem
| c1
| c8 d8 e8 f8 g8 f8 e8 d8 c2 c2
}
</lilypond>

[[Category:Contemporary notation]]
[[Category:Scheme]]
[[Category:Tweaks and overrides]]
[[Category:Rhythms]]