Cross-staff chords – beaming problems workaround: Difference between revisions

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-Sometimes it is better to use stems from the upper staff for creating cross-staff chords, because no problems with automatic beam collision avoidance then arise. If the stems from the lower staff were used in the following example, it would be necessary to change the automatic beam collision avoidance settings so that it doesn't detect collisions between staves using <code>\override Staff.Beam.collision-voice-only = ##t</code>
+Sometimes it is better to use stems from the ‘other’ staff for creating cross-staff chords to trick LilyPond's beam collision detector. In the following snippet, if the stems from the lower staff were used instead, it would be necessary to explicitly use
+ \override Staff.Beam.collision-voice-only = ##t
+so that LilyPond doesn't move the beams.
 <lilypond version="2.24">
 \new PianoStaff <<
-   \new Staff = up
+   \new Staff = up \relative c' <<
-    \relative c' {
+    { r4
-      <<
+      \override Stem.cross-staff = ##t
-        { r4
+      \override Stem.length = #19 % this is in half-spaces,
-          \override Stem.cross-staff = ##t
+          % so it makes stems 9.5 staffspaces long
-          \override Stem.length = #19 % this is in half-spaces,
+      \override Stem.Y-offset = #-6 % stems are normally lengthened
-              % so it makes stems 9.5 staffspaces long
+          % upwards, so here we must lower the stem by the amount
-          \override Stem.Y-offset = #-6 % stems are normally lengthened
+          % equal to the lengthening - in this case (19 - 7) / 2
-              % upwards, so here we must lower the stem by the amount
+          % (7 is default stem length)
-              % equal to the lengthening - in this case (19 - 7) / 2
+      e e e }
-              % (7 is default stem length)
+    { s4
-          e e e }
+      \change Staff = "bottom"
-        { s4
+      \override NoteColumn.ignore-collision = ##t
-          \change Staff = "bottom"
+      c, c c
-          \override NoteColumn.ignore-collision = ##t
-          c, c c
-        }
-      >>
-    }
-  \new Staff = bottom
-    \relative c' {
-      \clef bass
-      \voiceOne
-      g8 a g a g a g a
      }
+  >>
+  \new Staff = bottom \relative c' {
+    \clef bass
+    \voiceOne
+    g8 a g a g a g a
+  }
 >>
 </lilypond>
 [[Category:Chords]]
+[[Category:Keyboards]]
+[[Category:Tweaks and overrides]]
+[[Category:Workaround]]
 [[Category:Included in the official documentation]]
-[[Category:Tweaks and overrides]]
+[[Category:Snippet]]
-[[Category:Chords]]
-[[Category:Keyboards]]
-[[Category:Workaround]][[Category:Snippet]]