mpdolce - LilyPond

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Chapter 4: Tweaking output 82 presenting examples of how it is used. Here is a simple example to change the color of the note head: c d \override NoteHead #'color = #red e f g \override NoteHead #'color = #green a b c � � � � � � � \revert command � � � Once overridden, the property retains its new value until it is overridden again or a \revert command is encountered. The \revert command has the following syntax and causes the value of the property to revert to its original default value; note, not its previous value if several \override commands have been issued. \revert Context.LayoutObject #'layout-property Again, just like Context in the \override command, Context is often not needed. It will be omitted in many of the following examples. Here we revert the color of the note head to the default value for the final two notes: c d \override NoteHead #'color = #red e f g \override NoteHead #'color = #green a \revert NoteHead #'color b c � \once prefix � � � � � � � � � Both the \override and the \set commands may be prefixed by \once. This causes the following \override or \set command to be effective only during the current musical moment before the property reverts back to its default value. Using the same example, we can change the color of a single note like this: c d \once \override NoteHead #'color = #red e f g \once \override NoteHead #'color = #green a b c � � � � � � � � � \overrideProperty command �
Chapter 4: Tweaking output 83 There is another form of the override command, \overrideProperty, which is occasionally required. We mention it here for completeness, but for details see Section “Difficult tweaks” in Notation Reference. \tweak command The final tweaking command which is available is \tweak. This should be used to change the properties of objects which occur at the same musical moment, such as the notes within a chord. Using \override would affect all the notes within a chord, whereas \tweak affects just the following item in the input stream. Here’s an example. Suppose we wish to change the size of the middle note head (the E) in a C major chord. Let’s first see what \once \override would do: 4 \once \override NoteHead #'font-size = #-3 � � �� We see the override affects all the note heads in the chord. This is because all the notes of a chord occur at the same musical moment, and the action of \once is to apply the override to all layout objects of the type specified which occur at the same musical moment as the \override command itself. The \tweak command operates in a different way. It acts on the immediately following item in the input stream. However, it is effective only on objects which are created directly from the input stream, essentially note heads and articulations; objects such as stems and accidentals are created later and cannot be tweaked in this way. Furthermore, when it is applied to note heads these must be within a chord, i.e., within single angle brackets, so to tweak a single note the \tweak command must be placed inside single angle brackets with the note. So to return to our example, the size of the middle note of a chord would be changed in this way: 4
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