Re: Using 'scheme?' as predicate in a markup function.

[David Kastrup]

Pierre Perol-Schneider <address@hidden> writes:

> Hi,
>
> After some fights with 'draw-line thickness in a score containing numbers
> of arrows I've created this markup function:
> http://lsr.di.unimi.it/LSR/Item?id=1026
> My intention was to stick to the 'arrow-head syntax. So it goes:
>
> #(define-markup-command (foo layout props  axis  direction) (scheme?
> scheme?)
>   (interpret-markup layout props
>     (if (and (eq? axis X)(eq? direction 1))
>         (markup "foo")
>         (markup "no foo"))))
>
> I've never use 'scheme? before. Could this be problematic? If yes, is there
> any other way?

ly:dir? maybe.

-- 
David Kastrup