[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] Re: #5539 Text

For the already mentioned draw-dashed-line-markup one can specify full-length #f to insist on the given on/off-values.

In the code below I added such a markup with full-length #f, on 0.8, off 8. (It's red colored.)
Which mimics the settings for dash-fraction/period in your initial example.
The markup is moved in order to start exactly where the default dashed-text-spanner-line starts. Values for that are calculated based on the spanner-stencil values. See the commented code for ly:stencil-expr.

\relative c' {
  \override TextSpanner.dash-period = #8
  \override TextSpanner.dash-fraction= #0.1

  \override TextScript.color = #red

%  \override TextSpanner.after-line-breaking =
%  #(lambda (grob)
%    (pretty-print
%      (ly:stencil-expr (ly:grob-property grob 'stencil))))

  <>^\markup 
        \translate #'(2.913177952755998 . 0)
        \override #'(full-length . #f)
        \override #'(on . 0.8)
        \override #'(off . 8)
        \draw-dashed-line #'(14.1179170455133 . 0)

  \override TextSpanner.bound-details.left.text = "im"
  e1\startTextSpan e1 e1\stopTextSpan

  <>^\markup 
        \translate #'(6.839658267716501 . 0)
        \override #'(full-length . #f)
        \override #'(on . 0.8)
        \override #'(off . 8)
        \draw-dashed-line #'(10.1914367305527 . 0)

  \override TextSpanner.bound-details.left.text = "immer"
  e1\startTextSpan e1 e1\stopTextSpan
}

Attached the output image.

I think something like the red markup should never become the default.
Even as an option - - - why?

Ok, I had coded that full-length-true/false-option in the markup myself.
But this was pure paranoia ...

Though, I'm afraid implementing such an option into TextSpanner.stencil would mean C++-work. So I can't do it myself.

Attachments:

atest-92.png (8.4 kB; image/png)

[issues:#5539] TextSpanner: left text incorrectly influences dashes

Status: New
Created: Sat Jul 20, 2019 08:17 AM UTC by Werner LEMBERG
Last Updated: Sat Jul 20, 2019 09:17 PM UTC
Owner: nobody
Attachments:

text-spanner-wrong-dash-spacing.png (4.6 kB; image/png)

[git commit 49f41bf1c64ae1e2490571e73a85cbc4b2a9fb27]

\version "2.21.0"

\header { texidoc = "
  For a text spanner, the length of the (left) text element
  must not influence the distance between and the length of
  dashes.

  Here is a counterexample.
" }

\relative c' {
  \override TextSpanner.dash-period = #8
  \override TextSpanner.dash-fraction= #0.1

  \override TextSpanner.bound-details.left.text = "im"
  e1\startTextSpan e1 e1\stopTextSpan

  \override TextSpanner.bound-details.left.text = "immer"
  e1\startTextSpan e1 e1\stopTextSpan
}

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From:	Auto mailings of changes to Lily Issues via Testlilyissues-auto
Subject:	[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] Re: #5539 TextSpanner: left text incorrectly influences dashes
Date:	Sat, 20 Jul 2019 22:16:02 -0000