[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] Re: #5539 TextSpanner: left text incorrectly influences dashes

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There must be typos in your example code, thus I don't understand what you want to demonstrate. Could you elaborate?

Nevertheless, if you comment the lines with
\override #'(full-length . #f)
in my markup-code above, then the dashed-line starts/ends exactly. It ensures the line starts and ends with a dash. The dash itself is not scaled.
Though the off-values (specified was 8.0) is scaled to 12.5179170455133 and 8.5914367305527
So, in one case the provided value is scaled by ~150%
I wouldn't call this slightly...
But I don't see a way to avoid such a big scaling for certain off-values (the dash-period), if we want to ensure dashes at start and end of the line.

IIUC, the situation for TextSpanners is as follows:
'dash-period can be specified, then lily calculates how to scale the setted dash-period to ensure full line-extent.
And then the dash-fraction is applied to the scaled value.
As a consequence this results in different dash-extends (on-values).

In the markup command I tried to keep the dash-extend wherevere possible.
Only for small lines I implemented some conditions to either drop the line or print a dot or print a solid line.
For TextSpanners one could probably implement some settable not scaleable on-value (for the dash-extend), a scaleable off-value (for the white-space) and go for treshold-conditions like:
if no room for 1 dash, drop the line
if no room for 2 dashes, print a solid line
else scale the off-value to fit.

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

Status: New
Created: Sat Jul 20, 2019 08:17 AM UTC by Werner LEMBERG
Last Updated: Sun Jul 21, 2019 05:28 AM 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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