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Re: Hairpin with text inside
From: |
David Kastrup |
Subject: |
Re: Hairpin with text inside |
Date: |
Thu, 28 Jul 2016 17:04:00 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux) |
Rutger Hofman <address@hidden> writes:
>> Can you run this in a debugger so that one can get a backtrace and see
>> where the defective indexing actually occurs? Then it should be
>> possible to code an explicit behavior there.
>>
>
> Right.
>
> My lilypond is built without debugging symbols. It is full of:
> #4 0x000000000040e1c0 in ?? ()
> etc etc, no useful lilypond frames (there is a meaningful frame in
> assert.c:101).
>
> Do you still want the backtrace?
I looked at your example code and, well, it would be pointless to get a
backtrace here. Sorry, I had assumed that you set some argument in some
LilyPond call to CENTER and caught LilyPond on the wrong foot. If I had
looked more closely, I would not have asked for a backtrace which really
could not tell a better story than your original post.
You actually explicitly and manually call the Scheme function
(ly:stencil-combine-at-edge
(ly:stencil-aligned-to stencil X RIGHT)
Y CENTER
; Y DOWN
(ly:stencil-aligned-to (grob-interpret-markup grob text) X
RIGHT))
and that's just meaningless. There is no thing like a "center" edge.
The documentation string is clear here:
-- Function: ly:stencil-combine-at-edge first axis direction second
padding
Construct a stencil by putting SECOND next to FIRST. AXIS can be 0
(x-axis) or 1 (y-axis). DIRECTION can be -1 (left or down) or 1
(right or up). The stencils are juxtaposed with PADDING as extra
space. FIRST and SECOND may also be â'()â or â#fâ.
and it would be meaningless to apply padding when you just want to
superimpose two stencils. This rather sounds like you want to use
ly:stencil-add on the stencils, just combining them on the same
reference point.
I don't think there is _any_ point in letting ly:stencil-combine-at-edge
accept CENTER as the direction since I cannot think of anything useful
to do with the padding then: in which direction would one be supposed to
shift the second stencil when it overlapped the first one?
--
David Kastrup