<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <!-- header_tag --> <html lang="en"> <head> <title>Using Scheme code instead of \tweak - GNU LilyPond Notation Reference</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta name="description" content="GNU LilyPond Notation Reference"> <meta name="generator" content="makeinfo 4.11"> <link title="Top" rel="start" href="index.es.html#Top"> <link rel="up" href="TODO-moved-into-scheme.es.html#TODO-moved-into-scheme" title="TODO moved into scheme"> <link rel="next" href="Difficult-tweaks.es.html#Difficult-tweaks" title="Difficult tweaks"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <!-- Copyright (C) 1999--2007 by the authors Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with no Invariant Sections. 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For example, the following produces a syntax error. <pre class="example">F = \tweak #'font-size #-3 -\flageolet \relative c'' { c4^\F c4_\F } </pre> <p class="noindent">With other words, <code>\tweak</code> doesn't behave like an articulation regarding the syntax; in particular, it can't be attached with <code>^</code> and <code>_</code>. <p>Using Scheme, this problem can be circumvented. The route to the result is given in <a href="Adding-articulation-to-notes-_0028example_0029.es.html#Adding-articulation-to-notes-_0028example_0029">Adding articulation to notes (example)</a>, especially how to use <code>\displayMusic</code> as a helping guide. <pre class="example">F = #(let ((m (make-music 'ArticulationEvent 'articulation-type "flageolet"))) (set! (ly:music-property m 'tweaks) (acons 'font-size -3 (ly:music-property m 'tweaks))) m) \relative c'' { c4^\F c4_\F } </pre> <p class="noindent">Here, the <code>tweaks</code> properties of the flageolet object <code>m</code> (created with <code>make-music</code>) are extracted with <code>ly:music-property</code>, a new key-value pair to change the font size is prepended to the property list with the <code>acons</code> Scheme function, and the result is finally written back with <code>set!</code>. The last element of the <code>let</code> block is the return value, <code>m</code> itself. <!-- footer_tag --><br><hr> <div class="node"> <p> <a name="Using-Scheme-code-instead-of-_005ctweak"></a> Next: <a rel="next" accesskey="n" href="Difficult-tweaks.es.html#Difficult-tweaks">Difficult tweaks</a>, Up: <a rel="up" accesskey="u" href="TODO-moved-into-scheme.es.html#TODO-moved-into-scheme">TODO moved into scheme</a> </div> <div style="background-color: #e8ffe8; padding: 2; border: #c0ffc0 1px solid;"> <p> <font size="-1"> Esta página corresponde a LilyPond-2.11.57 (rama de desarrollo). <br> <address> Informe de los fallos a través de la lista en español <a href="http://es.groups.yahoo.com/group/lilypond-es/">lilypond-es</a>, o en inglés a través de <a href="http://post.gmane.org/post.php?group=gmane.comp.gnu.lilypond.bugs">http://post.gmane.org/post.php?group=gmane.comp.gnu.lilypond.bugs</a>. </address> <br> Se agradecen las <a href="http://lilypond.org/web/devel/participating/documentation-adding">sugerencias para la documentación</a>. </font> </p> </div> </BODY></html>