Or even:

shake =
-\tweak stencil #(lambda (grob)(grob-interpret-markup grob
purcell-shake-glyph))
\trill

Cheers,
Pierre

2016-07-19 9:44 GMT+02:00 Pierre Perol-Schneider <
[email protected]>:

> Hi Andrew,
>
> Interesting question.
> I'm not familiar with Purcell's work but what I found on IMSLP was that
> this shake is used as (e.g.) a trill.
> So how about :
>
> \version "2.19.45"
>
> purcell-shake-glyph =
> \markup\stencil
>   #(make-path-stencil
>      '(M -0.20  0.05 L  1.55  0.51 M -0.31  0.43 L  1.45  0.90)
>      0.17 1 1 #f)
>
> shake =
> #(define-event-function () ()
>    #{
>      -\tweak stencil #(lambda (grob)(grob-interpret-markup grob
> purcell-shake-glyph))
>      \trill #})
>
> %% Test:
> {
>   a'\shake
> }
>
> Cheers,
> Pierre
>
>
> 2016-07-19 2:34 GMT+02:00 Andrew Bernard <[email protected]>:
>
>> Hi Pierre,
>>
>> Wouldn’t it be better to do these are actual ornaments instead of just
>> markup? I say this because there is a page on the lilyond blog regarding
>> this, but it is only partially complete. If we did them as ornaments the
>> possibility would arise of being able to use them to set English Virginal
>> Music which uses the slash and double slash, through the stem, extensively
>> - although as folks have noted, nobody really knows what they mean.
>>
>> Since I am a harpsichord player I am one day going to do all the many
>> varieties of the French keyboard ornaments, a rich and flowering garden, so
>> I  have just now taken an interest in this thread.
>>
>> Andrew
>>
>>
>
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