Re: our quadratic triangle

[James]

On Wed, 2021-01-27 at 14:31 +0100, Robin Bannister wrote:
> Hallo again
> 
> 
> In the meantime it has occurred to me that moving the gratuitous
> magstep 
> scaling from baseline-skip over to thickness is perhaps not the
> answer.
> 
> Since the triangle is applied mainly as a glyph it should not respond
> to
> overrides on those two properties.  Consider squashing a vertical
> column 
> by reducing its baseline-skip; a triangle somewhere in the column
> would 
> be resized, unlike any of its font neighbors.
> 
> 
> So what about a markup that ignores all properties except the font
> size?
> It could offer some flexibilty via parameters, eg:
> 
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> 
> #(define-markup-command (delta-bhr layout props b-cents h-cents r-
> cents)
>       (number? number? number?)
>      #:properties ((font-size 0))
>        (let* (
>            (cent (/ (magstep font-size) 100))
>            (base (* b-cents cent))
>            (height (* h-cents cent))
>            (radius (* r-cents cent)) ; of dot
>            (thickness (* 2 radius))) ; of line
>         (ly:make-stencil  `(polygon
> ;     '(0.0 ,radius ,base ,radius ,(* 0.5 base) ,(+ height radius))
> ;old
>         (0.0 ,radius ,base ,radius ,(* 0.5 base) ,(+ height radius))
> ;new
>           ,thickness  #f)
>         (interval-widen (cons 0 base) radius)
>         (cons 0 base) )))
> 
> delta = \markup \delta-bhr #120 #130 #10 % customised for "sans-
> serif"
> 
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> 
> 
> Just my two cents.   Or three in this case.
> 
> 
> Cheers,
> Robin
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Added as https://gitlab.com/lilypond/lilypond/-/issues/6096

James