Re: [Lilypond-auto] Issue 3336 in lilypond: Proper spacing with text and script stencils

[lilypond]

Updates:
        Labels: -Patch-review Patch-new

Comment #6 on issue 3336 by address@hidden: Proper spacing with text  
and script stencils
http://code.google.com/p/lilypond/issues/detail?id=3336

I can't think of a shorter explanation than this:
The fret-diagrams in question are set as centered TextScripts over the  
notes (as opposed to being in a FretBoards context).  \textLengthOn  
reserves space for an infinite column as wide as the text, for note-spacing  
purposes.

\textLengthOn uses extents, not skylines, and this has created some  
difficulty:
1) If we use any horizontal-padding on the TextScript skylines, that  
padding is not counted in the note-spacing, so the TextScripts overlap a  
bit and are stacked vertically (issue 3032)
2) If we use zero horizontal-padding, we occasionally get stems in words  
like "Ja" above
3) If we use extents instead of skylines when \textLengthOn, people  
complain as they did on issue 3268 (comment 8 about fret boards).

We would like to integrate skylines better into the rest of the layout  
system, or at least have a variant of horizontal-padding that works on the  
interior only of the skylines, but I suggest we first set defaults to make  
the system we have usable.

\textLengthOn is most often used with a TextScript over every note, which  
runs the text together. The documentation example linked to issue 3032  
added padding by hand.  A word-space of padding is greater than the  
letter-space of horizontal-padding needed to keep stems out of words, so if  
we build one word-space into \textLengthOn we avoid problems with the  
current system.  I put half of a 0.4-ss word-space on either side.

So in 'fret-diagrams-fingering.ly' the fretboard has moved half a  
word-space so that its infinitely-high column clears the barline, moving  
its parent note with it, and the next barline remains the standard spacing  
from that parent note.

We could put the entire word-space on the right side of the infinite column  
made by \textLengthOn, which has worked well for me in my own spacing of  
tempo marks.  This is unsymmetric left-to-right, as is the spacing of notes  
with respect to barlines.

'multi-measure-rest-text.ly', when compiled alone, shows only the text  
moving away due to the horizontal-padding, and no change to spacing between  
systems.   The regression test scripts include "lilypond-book-preamble.ly"  
which separates systems so their total heights clear, presumably to  
facilitate making separate output files for each system.  All the regtests  
where system-system spacing is importante, have the scores enclosed in a  
\book {}, so I can do that for 'multi-measure-rest-text.ly'

  http://codereview.appspot.com/9210044

Attachments:
        textLengthOn_illustration.png  5.7 KB

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