At Wed, 22 May 2013 15:32:17 +0200, Laurent wrote:
> Is it possible in slideshow to change the baseline of a pict?
>
> I have the following code to draw a fraction:
>
> ;; Fraction
> ;; pict? pict? -> pict?
> (define (frac a b)
> (vc-append
> a
> (hline (max (pict-width a) (pict-width b)) 20)
> b))
>
> and I want to do some thing like:
> (hbl-append (t "x=") (frac (t "1234") (t "5678")))
>
> so that the hline is aligned with the =.
>
> I tried the various procedures like `lift-above-baseline` and such but with
> no luck.
The `lift-above-baseline' function should be what you want, but with a
negative offset (so that it actually drops below the baseline).
#lang slideshow
;; Fraction
;; pict? pict? -> pict?
(define (frac a b)
(lift-above-baseline
(vc-append
a
(hline (max (pict-width a) (pict-width b)) 20)
b)
(- (pict-descent b) (pict-height b))))
(slide (hbl-append (t "x=") (frac (t "1234") (t "5678"))))
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