Re: Setting default arguments for music function?
Fantastic! Thanks again.
On Tue, Jan 31, 2023 at 7:28 PM Jean Abou Samra wrote:
> On 01/02/2023 01:23, Ahanu Banerjee wrote:
> > Is it possible to have one of the arguments rely on a property of
> another argument?
> >
> > In my example, I want the default value for "parenColor" to be the same
> as the color of the "parenItem":
> >
> > \version "2.24"
> > \language "english"
> > altParen = #(define-music-function
> > (parenColor parenSize parenItem)
> > ( (color? "black") (number? -4) ly:music?)
> >#{
> > \tweak Parentheses.font-size #parenSize \tweak Parentheses.color
> #parenColor \parenthesize #parenItem
> >#})
> > { c \altParen -\tweak color "green" \upbow }
>
>
> Well, the color you want to access isn't a property of parentItem.
> parenItem is just a bit of music. Rather, it is a property of the
> grob that will eventually be caused by the music parentItem. So,
> in the music function, the color is not available. However, what
> you can do is writing a callback which runs waay later in the process,
> and can access it. Cf.
>
>
> https://extending-lilypond.readthedocs.io/en/latest/extending/backend.html#understanding-callbacks
>
> \version "2.24.0"
>
> \language "english"
>
> #(define (color-from-host grob)
>(ly:grob-property (ly:grob-object grob 'sticky-host) 'color))
>
> altParen = #(define-music-function
> (parenColor parenSize parenItem)
> ( (color? color-from-host) (number? -4) ly:music?)
>#{
> \tweak Parentheses.font-size #parenSize \tweak Parentheses.color
> #parenColor \parenthesize #parenItem
>#})
> { c \altParen -\tweak color "green" \upbow }
>
>
>
> Actually, because this is a common pattern for grobs like parentheses
> which attach to another grob, there is a shortcut:
>
> \version "2.24.0"
>
> \language "english"
>
> altParen = #(define-music-function
> (parenColor parenSize parenItem)
> ( (color? (sticky-grob-interface::inherit-property 'color)) (number?
> -4) ly:music?)
>#{
> \tweak Parentheses.font-size #parenSize \tweak Parentheses.color
> #parenColor \parenthesize #parenItem
>#})
> { c \altParen -\tweak color "green" \upbow }
>
>
>
> Jean
>
>
>
Re: Setting default arguments for music function?
On 01/02/2023 01:23, Ahanu Banerjee wrote:
> Is it possible to have one of the arguments rely on a property of another
> argument?
>
> In my example, I want the default value for "parenColor" to be the same as
> the color of the "parenItem":
>
> \version "2.24"
> \language "english"
> altParen = #(define-music-function
> (parenColor parenSize parenItem)
> ( (color? "black") (number? -4) ly:music?)
> #{
> \tweak Parentheses.font-size #parenSize \tweak Parentheses.color
> #parenColor \parenthesize #parenItem
> #})
> { c \altParen -\tweak color "green" \upbow }
Well, the color you want to access isn't a property of parentItem.
parenItem is just a bit of music. Rather, it is a property of the
grob that will eventually be caused by the music parentItem. So,
in the music function, the color is not available. However, what
you can do is writing a callback which runs waay later in the process,
and can access it. Cf.
https://extending-lilypond.readthedocs.io/en/latest/extending/backend.html#understanding-callbacks
\version "2.24.0"
\language "english"
#(define (color-from-host grob)
(ly:grob-property (ly:grob-object grob 'sticky-host) 'color))
altParen = #(define-music-function
(parenColor parenSize parenItem)
( (color? color-from-host) (number? -4) ly:music?)
#{
\tweak Parentheses.font-size #parenSize \tweak Parentheses.color
#parenColor \parenthesize #parenItem
#})
{ c \altParen -\tweak color "green" \upbow }
Actually, because this is a common pattern for grobs like parentheses
which attach to another grob, there is a shortcut:
\version "2.24.0"
\language "english"
altParen = #(define-music-function
(parenColor parenSize parenItem)
( (color? (sticky-grob-interface::inherit-property 'color)) (number? -4)
ly:music?)
#{
\tweak Parentheses.font-size #parenSize \tweak Parentheses.color
#parenColor \parenthesize #parenItem
#})
{ c \altParen -\tweak color "green" \upbow }
Jean
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Re: Setting default arguments for music function?
Is it possible to have one of the arguments rely on a property of another
argument?
In my example, I want the default value for "parenColor" to be the same as
the color of the "parenItem":
\version "2.24"
\language "english"
altParen = #(define-music-function
(parenColor parenSize parenItem)
( (color? "black") (number? -4) ly:music?)
#{
\tweak Parentheses.font-size #parenSize \tweak Parentheses.color
#parenColor \parenthesize #parenItem
#})
{ c \altParen -\tweak color "green" \upbow }
Thanks,
-Ahanu
On Tue, Jan 31, 2023 at 7:10 PM Ahanu Banerjee
wrote:
> Thanks! I had no idea that that resource existed.
> Appreciate all your help.
>
> -Ahanu
>
> On Tue, Jan 31, 2023 at 7:08 PM Jean Abou Samra
> wrote:
>
>> On 01/02/2023 01:04, Ahanu Banerjee wrote:
>> > Is it possible to specify default values for a function to use when
>> arguments are missing? In the example below, I want the default font size
>> to be -4 and the default color to be blue without having to specify it each
>> time, but I also want the ability to change those values in rare cases.
>> >
>> > \version "2.24"
>> > \language "english"
>> > altParen = #(define-music-function
>> > (parenColor parenSize parenItem)
>> > (color? number? ly:music?)
>> >#{
>> > \tweak Parentheses.font-size #parenSize \tweak Parentheses.color
>> #parenColor \parenthesize #parenItem
>> >#})
>> > { c \altParen "blue" #-4 \upbow }
>>
>>
>> Perhaps read this:
>>
>>
>> https://extending-lilypond.readthedocs.io/en/latest/extending/music.html#optional-arguments
>>
>> Best,
>> Jean
>>
>>
>>
Re: Setting default arguments for music function?
Thanks! I had no idea that that resource existed.
Appreciate all your help.
-Ahanu
On Tue, Jan 31, 2023 at 7:08 PM Jean Abou Samra wrote:
> On 01/02/2023 01:04, Ahanu Banerjee wrote:
> > Is it possible to specify default values for a function to use when
> arguments are missing? In the example below, I want the default font size
> to be -4 and the default color to be blue without having to specify it each
> time, but I also want the ability to change those values in rare cases.
> >
> > \version "2.24"
> > \language "english"
> > altParen = #(define-music-function
> > (parenColor parenSize parenItem)
> > (color? number? ly:music?)
> >#{
> > \tweak Parentheses.font-size #parenSize \tweak Parentheses.color
> #parenColor \parenthesize #parenItem
> >#})
> > { c \altParen "blue" #-4 \upbow }
>
>
> Perhaps read this:
>
>
> https://extending-lilypond.readthedocs.io/en/latest/extending/music.html#optional-arguments
>
> Best,
> Jean
>
>
>
Re: Setting default arguments for music function?
On 01/02/2023 01:04, Ahanu Banerjee wrote:
> Is it possible to specify default values for a function to use when arguments
> are missing? In the example below, I want the default font size to be -4 and
> the default color to be blue without having to specify it each time, but I
> also want the ability to change those values in rare cases.
>
> \version "2.24"
> \language "english"
> altParen = #(define-music-function
> (parenColor parenSize parenItem)
> (color? number? ly:music?)
> #{
> \tweak Parentheses.font-size #parenSize \tweak Parentheses.color
> #parenColor \parenthesize #parenItem
> #})
> { c \altParen "blue" #-4 \upbow }
Perhaps read this:
https://extending-lilypond.readthedocs.io/en/latest/extending/music.html#optional-arguments
Best,
Jean
OpenPGP_signature
Description: OpenPGP digital signature
Setting default arguments for music function?
Is it possible to specify default values for a function to use when
arguments are missing? In the example below, I want the default font size
to be -4 and the default color to be blue without having to specify it each
time, but I also want the ability to change those values in rare cases.
\version "2.24"
\language "english"
altParen = #(define-music-function
(parenColor parenSize parenItem)
(color? number? ly:music?)
#{
\tweak Parentheses.font-size #parenSize \tweak Parentheses.color
#parenColor \parenthesize #parenItem
#})
{ c \altParen "blue" #-4 \upbow }
Thanks,
-Ahanu
