2018-02-04 20:30 GMT+01:00 Stefano Troncaro <stefanotronc...@gmail.com>:
> Thank you! This is a workable starting point. However, it raised a few
> questions.
>
> 1) I noticed that rotating the grob doesn't work well with automatic
> collision detection, since the grob skylines are still where they would be
> for the unrotated grob. See this example code and the attached images:
>>
>> \version "2.19.80"
>> \language "english"
>>
>> tweaks = {
>>   \once \override Hairpin.rotation = #'(9 0 0)
>>   %\once \override Hairpin.extra-offset = #'(0 . -1)
>> }
>>
>> \score {
>>   \new Staff \relative c' { \time 2/2 \tweaks d8[^\<(^"some really long
>> text here!" e f g a b c d]\!) |
>>                             <e c g g,>4\arpeggio  }
>>   \layout {
>>     \context {
>>       \Score
>>       \override Hairpin.height = #0.5
>>     }
>>   }
>> }
>
> This makes me hesitate for the same reason that using extra-offset does: I'd
> want to tweak the shape of the Hairpins and have Lilypond automatically work
> out the correct spacing between different grobs and staves. So, how can I
> make it so that the skylines are also updated when I rotate the grob? Or, if
> internally the grob is first placed and then rotated, how can I make it so
> that the rotation occurs before Lilypond calculates the positioning and
> spacing of grobs?

Don't use extra-offset to place things, unless you _want_ them overlap
or as very, very last resort.
Use 'shorten-pair to affect length of the Hairpin, working with
Hairpins for newer devel-versions, Thanks David Nalesnik, iirc.
'rotation comes too late, use a stencil-override with ly:stencil-rotate instead.
See below.

\version "2.19.80"

tweaks = {
  \once \override Hairpin.shorten-pair = #'(-2 . -2)
  \once \override Hairpin.stencil =
    #(lambda (grob)
        (ly:stencil-rotate (ly:hairpin::print grob) 9 0 0))
}

\score {
  \new Staff
    \relative c' {
      \time 2/2
      \tweaks
      d8[^\<(^"some really long text here!" e f g a b c d]\!) |
      <e c g g,>4\arpeggio
    }
  \layout {
    \context {
      \Score
      \override Hairpin.height = #0.5
    }
  }
}

Cheers,
  Harm

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