Re: our quadratic triangle

[Robin Bannister]

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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