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Re: Determine if a stem is present


From: Urs Liska
Subject: Re: Determine if a stem is present
Date: Mon, 27 Mar 2017 12:01:20 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Icedove/45.6.0


Am 27.03.2017 um 11:45 schrieb Thomas Morley:
> 2017-03-27 11:38 GMT+02:00 Urs Liska <address@hidden>:
>> Hi all,
>>
>> I want to know if a given notehead has a stem attached. Obviously even
>> whole notes do have a stem object, but with zero extent.
>>
>> I've found the following calculation to be reliable, but I can't imagine
>> it has to be so complicated:
>>
>>     (if (or (= +inf.0 (car stem-y-extent))
>>             (= -inf.0 (car stem-y-extent))
>>             (= +inf.0 (cdr stem-y-extent))
>>             (= -inf.0 (cdr stem-y-extent)))
>>
>> (with stem-y-extent being the Y-extent property of the stem object).
>>
>> I think there should be some property I can ask directly about this? But
>> I didn't find any suspicious entry for Stem or stem-interface.
>>
>> Any suggestions?
>> Urs
> interval-sane?
>
> exp.:
>
> (interval-sane? (ly:stencil-extent empty-stencil X))
> --> #f
>
> Maybe grob::is-live? may help as well, didn't test that.

Ah, no, but it brought me in the right direction. While

(ly:grob-object notehead 'stem) does give an object
(ly:grob-property stem 'stencil) => '()

Thanks
Urs

>
>
> HTH,
>   Harm

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