Re: Attach point-and-click link to custom stencil

[David Kastrup]

Urs Liska <address@hidden> writes:

> Am 13.03.2017 um 13:07 schrieb David Kastrup:
>> Urs Liska <address@hidden> writes:
>>
>>> when writing a callback function to override a stencil, how can I attach
>>> the original point-and-click link to the resulting graphics?
>> Isn't it attached automatically?  I don't think the usual stencil
>> callbacks bother with point-and-click info themselves.
>
> It seems not, they are not clickable.
> I'm calling the function with \override Tie.stencil = #arced-curve-stencil
>
> which is defined as
>
> #(define (arced-curve-stencil grob)
>    ...
>
> and returns the result of a (ly:stencil-translate (ly:make-stencil call.

The point-and-click area is rectangular and taken from the stencil's
position and dimensions, so there is suspicion that they aren't what you
want them to be.

>>> Is that even possible, as I'm not actually dealing with the grob
>>> anymore (isn't it)?
>>>
>>> I know how to get the location from inside the ties and slurs I'm
>>> dealing with, but I don't know how I can get this information back
>>> into the resulting element in the PDF.
>> With stencils, you should not need to do anything.  When calling
>> ly:engraver-make-grob yourself, be sure to specify a good cause.  Then
>> the originating event's point-and-click info will be automatically
>> attached.
>
> As usual the information about ly:engraver-make-grob on the
> Scheme-functions page doesn't help me very much. All I would be able to
> figure out is the cause, but what kind of "engraver instance" should I
> be referring to here?

The one passed to the engraver callback?

-- 
David Kastrup