Hi Werner,
I disagree.
The dashed line of a TextSpanner _must_ start right after left-text. It _must_
end right before right-text or as in your example at the target NoteColumn.
(for line-breaks similar).
This can't be warranted while exactly following the user-setted
dash-period/fraction.
Some scaling is _always_ needed. Otherwise the dashed line will be too short or
too long.
In your eample:
If I read out the dashed-line-settings from the 'stencil I get:
~~~
%% im
(dashed-line
0.1
0.672281764072063
6.05053587664857
14.1179170455133
0.0
0.0))
%% immer
(dashed-line
0.1
0.926494248232063
8.33844823408857
10.1914367305527
0.0
0.0)
~~~
dashed-line has settings for thickness, on, off, x-destination, y-destination
and phase (in this order)
IIUC:
on, off are the here relevant variables, influenced by dash-period/fraction,
note: dash-fraction is a percentage not an absolute value.
'on' is the printed part
'off' is the white space part
So in the first example (+ on off on off on) should lead to the x-destination,
which is correct.
In the second example (+ on off on) should lead to the x-destination, which is
correct as well.
OTOH (+ on off) is in both cases not the setted dash-period:
6.722817640720633 for the first, 9.264942482320633 for the second stencil.
Looks like lily scales both, the length of the printed dash _and_ the white
space between them to find an accaptable trade-off.
Whether current approach is the best, may be discussable, but you can't avoid
scaling, imho.
In the draw-dashed-line-markup which I implementd some time ago, I scaled 'on'
only for a rare corner case (_very_ short line) otherwise only 'off' is tackled.
---
** [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 08:19 AM UTC
**Owner:** nobody
**Attachments:**
-
[text-spanner-wrong-dash-spacing.png](https://sourceforge.net/p/testlilyissues/issues/5539/attachment/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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