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Re: Extending the width of a glissando
From: |
David Kastrup |
Subject: |
Re: Extending the width of a glissando |
Date: |
Tue, 21 Sep 2021 00:40:02 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
Jean Abou Samra <jean@abou-samra.fr> writes:
> Le 20/09/2021 à 23:55, David Kastrup a écrit :
>> Jean Abou Samra <jean@abou-samra.fr> writes:
>>
>>> Le 20/09/2021 à 23:31, David Kastrup a écrit :
>>>> Jean Abou Samra <jean@abou-samra.fr> writes:
>>>>
>>>>> Thoughts? One would have to look at the most typical use cases
>>>>> to decide on an interface.
>>>> Anything wrong with using a ly:transform? type? It's straightforward to
>>>> create and manipulate.
>>> I had already forgotten about those. Given sufficient
>>> documentation, it would probably work well.
>> I find in the IR:
>>
>> -- Function: ly:make-transform xx yx xy yy x0 y0
>> Create a transform. Without options, it is an identity transform.
>> Given four arguments XX, YX, XY, and YY, it is a linear transform,
>> given six arguments (with X0 and Y0 last), it is an affine
>> transform. Transforms can be called as functions on other
>> transforms (concatening them) or on points given either as complex
>> number or real number pair. See also ‘ly:make-rotation’,
>> ‘ly:make-scaling’, and ‘ly:make-translation’.
>>
>> -- Function: ly:transform? x
>> Is X a ‘Transform’ object?
>>
>> -- Function: ly:transform->list transform
>> Convert a transform matrix to a list of six values. Values are XX,
>> YX, XY, YY, X0, Y0.
>>
>> -- Function: ly:make-translation x y
>> Make a transform translating by X and Y. If only X is given, it
>> can also be a complex number or a pair of numbers indicating the
>> offset to use.
>>
>> -- Function: ly:make-rotation angle center
>> Make a transform rotating by ANGLE in degrees. If CENTER is given
>> as a pair of coordinates, it is the center of the rotation,
>> otherwise the rotation is around (0 . 0).
>>
>> -- Function: ly:make-scaling scale scaley
>> Create a scaling transform from argument SCALE and optionally
>> SCALEY. When both arguments are given, they must be real and give
>> the scale in X and Y direction. If only SCALE is given, it may
>> also be complex to indicate a scaled rotation in the manner of
>> complex number rotations, or a pair of reals for specifying
>> different scales in X and Y direction like with the first calling
>> convention.
>
>
> Sure, I didn't mean that transforms weren't well-documented.
> I just suggest a paragraph of NR documentation, possibly linking
> back to the IR, simply because the kind of technical language
> we use in IR isn't obvious to understand for most users I would
> guess (linear transform? complex number? number pair? etc.).
But that's a programming tool. There is not much of a point in the NR.
And even the level of the EG does not seem to make it much of a good fit
there.
--
David Kastrup
- Re: Extending the width of a glissando, (continued)
- Re: Extending the width of a glissando, Jean Abou Samra, 2021/09/20
- Re: Extending the width of a glissando, Lukas-Fabian Moser, 2021/09/20
- Re: Extending the width of a glissando, Jean Abou Samra, 2021/09/20
- Re: Extending the width of a glissando, David Kastrup, 2021/09/20
- Re: Extending the width of a glissando, Jean Abou Samra, 2021/09/20
- Re: Extending the width of a glissando, David Kastrup, 2021/09/20
- Re: Extending the width of a glissando, Jean Abou Samra, 2021/09/20
- Re: Extending the width of a glissando,
David Kastrup <=
- Re: Extending the width of a glissando, Lukas-Fabian Moser, 2021/09/20