Hi Neil,
2011/12/25 Neil Puttock <[email protected]>:
>
> On 25 Dec 2011 22:27, "Thomas Morley" <[email protected]> wrote:
>
>> 1. IR 3.2.109 stem-interface states: "flag (graphical (layout) object)
>> A pointer to a Flag object."
>> I would have expected: () (there is no flag!)
>
> The unused flag is suicided. A pointer to the suicided grob still exists.
>
>> 2. AFAIK a Grob "Item" doesn't exist. IR 3.2.49 item-interface states
>> only that there is a subtype of grobs called Item.
>
> The Item class includes all grobs which represent discrete graphical objects
> such as font glyphs or abstract objects which contain other grobs. When a
> grob is suicided, most of its properties are cleared, including the name, so
> the scheme print function defaults to the class name (Item or Spanner in
> most cases).
>
> Cheers,
> Neil
thanks for the explication.
I think there could be some difficulties to find the correct
condition, when I create my own definitions/functions:
\version "2.15.20"
displayGrob =
\once\override Stem #'after-line-breaking =
#(lambda (grob)
(let* ((beam (ly:grob-object grob 'beam))
(flag (ly:grob-object grob 'flag)))
(begin
(if (ly:grob? beam)
(display "Yes")
(display "No"))
(newline)
(if (ly:grob? flag)
(display "Yes")
(display "No"))
(newline))))
{ \displayGrob c'8[ d'] }
I retrieve "Yes" in both cases.
Cheers,
Harm
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