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Re: note head extents and event procedures (tabstaff)

From: Thomas Morley
Subject: Re: note head extents and event procedures (tabstaff)
Date: Wed, 23 Dec 2015 00:13:19 +0100

2015-12-22 20:24 GMT+01:00 Steve Fullerton <address@hidden>:
>  I wasn't very clear in my first post. I've included an example this time.
> I am taking over the bendAfter stencil and drawing something else in its
> place. However the 'width' calculation in the code below doesn't account for
> double digit fret numbers. I think it is returning the width of a music
> note, not the width of a tab note. Changing ly:note-head to ly:tab-note-head
> doesn't work either.
> I have a couple of questions.
> 1. How do you work out the position of the right side of the tab note head
> so I can position my markup correctly?
> 2. Is there a better way to do this or is taking over a stencil the right
> way to do this? In other words, what is the best way to draw stuff to the
> left or right of a tab note?
> I am only concerned about TabStaff here so if the solution doesn't work for
> Staff it is not a problem.
> Thanks for your help.

Hi Steve,

I never worked with bendAfter before, so it took some time to get a
bit familiar with it _and_ because it's so weird:

(1) BendAfter is ignored by the spacing-engine! Is this really intended?
Switch to `test-stil' in the code at the end of this mail to test.
(2) It's behaviour is buggy if ledger-lines come into play, see the
attached untweaked png

code for it:

\version "2.19.32"

  e''4..\2\bendAfter #1
  a''4..\2\bendAfter #1

Thus, cc-ing bug-list.

Nevertheless in most cases translating the newly created stencil by
the car of the original-X-extent will work:

\version "2.18.2"

psBendArrow = #"
  0.1 setlinewidth
  0.0 -0.75 moveto
  0.0 -0.75 0.2 -0.75 0.4 0 curveto
  0.4 0.9 lineto
  0.4 1.0 moveto
  0.1 0.5 lineto
  0.7 0.5 lineto
  closepath fill

stil =
#(lambda (grob) (grob-interpret-markup grob (markup #:postscript psBendArrow)))

test-stil =
#(lambda (grob) (grob-interpret-markup grob "xxxxxx"))

foo =
\override BendAfter.after-line-breaking =
  #(lambda (grob)
     (ly:grob-set-property! grob 'stencil
          ;; nb, settings for BendAfter doesn't affect spacing!
          ;; switch to `test-stil' to watch this
          (stil grob)
          ;(test-stil grob)
          (car (ly:grob-property grob 'X-extent))

mus = {
  e''4\2\bendAfter #1
  a''4\2\bendAfter #1

\score {
    \new Staff \mus
    \new TabStaff \mus
  \layout {
    \context {


Attachment: atest-28-untweaked-bend.png
Description: PNG image

Attachment: atest-28-tweaked-bend.png
Description: PNG image

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