On 12/13/08 6:48 AM, "Reinhold Kainhofer" <reinh...@kainhofer.com> wrote:
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I can't help on three of them, but I can help on one....
>
> However, I'm running into some problems:
> - -) How can I obtain the line-thickness. It's not a property of the stem grob
> and in the flag formatting function I don't have the curent layout object
> available...
> - -) How can I obtain the width of a black notehead? In particular, for grace
> notes the flag needs to be scaled according to the note head, so the
> staff-space can't be used for this.
> - -) What's the best way to convert an angle/length pair of polar coordinates
> (angle given in degree) to cartesian coordinates in scheme / guile? I
> don't want it as a complex number, but as a pair of reals...
Here's code that works; I can't promise it's the *best* way:
(define (polar->rectangular polar-pair)
"Convert @code{polar-pair}, a pair containing (magnitude .
angle-in-degrees)
to (x-length . y-length)"
(let* ((conversion-constant (/ (atan 1 1) 45))
(length (car polar-pair))
(angle (* conversion-constant (cdr polar-pair))))
(cons
(* length (cos angle))
(* length (sin angle)))))
HTH,
Carl
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