Re: Inserting a "hard" white space?

[Aaron Hill]

On 2020-09-09 7:27 pm, Alasdair McAndrew wrote:
> I have created a few expression marks (for some early 18th century 
> music
> I'm trying to typeset) which I put into place with carefully adjusted x 
> and
> y offsets.  The trouble is that Lilypond doesn't take these marks into
> account when spacing out notes and bars, and sometimes the expression 
> mark
> is written over by a bar line.

This could point to issues with how you are defining expression marks.  
Ideally, you should prefer an approach that gives LilyPond enough 
information to make the appropriate decisions regarding spacing, so that 
the BarLine and custom expression mark do not collide.


> What is the approved or simplest way of adding extra space after a bar
> line?  Note that I don't need to add extra space after every bar line, 
> just
> occasionally.

Consider the following:

%%%%
\version "2.20.0"

mx = -\tweak extra-offset #'(-1.5 . 4.35)
     _\markup \sans x

fx = -\tweak font-size #0
     -\tweak X-offset #-1.5
     -\tweak Y-offset #0
      \finger \markup \normal-text \vcenter \sans x

{ | b'1
  | b'4 \mx b'2.
  | \tweak extra-spacing-width #'(-1.5 . 0)
    b'4 \mx b'2.
  | b'4 \fx b'2. }
%%%%

\mx is defined using a TextScript grob that is manually re-positioned 
via extra-offset, whereas \fx uses the Fingering grob that is positioned 
relative to the NoteHead via X-offset and Y-offset.

To avoid the collision between the BarLine and \mx, we can \tweak the 
extra-spacing-width of the NoteHead to ask LilyPond to reserve more 
space before the note.  No such \tweaking is needed for \fx to avoid 
collision.


-- Aaron Hill

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