Sure, it would be nice. FWIW, there is also the pict library. Robby
On Tue, Oct 22, 2013 at 10:07 AM, Daniel Prager <daniel.a.pra...@gmail.com>wrote: > Good to understand the trade-off. In a similar vein I see that in BSL (+ > ...), for example, requires at least two arguments vs zero or more in > racket. > > I did find it a little odd that I had recourse to use a "teachpack" to > gain access to this nice set of general-purpose drawing abstractions. Are > the facilities provided in 2htdp/image used a fair bit in non-teaching > contexts? If so, > would it make sense to factor out a racket-oriented library at some stage? > > Dan > > > On Tue, Oct 22, 2013 at 5:33 AM, Matthias Felleisen > <matth...@ccs.neu.edu>wrote: > >> >> This is of course a symptom of the more general problem that we fail to >> have a mechanism that specializes a module to a particular language >> context. In *SL, the restriction is absolutely great; in Racket, the >> restriction is a pain. Note that units wouldn't solve the problem cleanly >> either -- Matthias >> >> >> >> >> >> >> >> On Oct 22, 2013, at 8:14 AM, Robby Findler <ro...@eecs.northwestern.edu> >> wrote: >> >> > I did this explicitly because (I believe) it helps with parenthesis >> errors when beginning students make simple mistakes using the library. For >> more advanced programmers, it seems straightforward to define things like: >> > >> > (define (above* . is) (cond [(null? is) (blank)][(null? (cdr is)) (car >> is)][else (apply above is)]) >> > >> > and you can even abstract that as a function that takes something like >> above and builds an above* from it. >> > >> > Robby >> > >> > >> > On Mon, Oct 21, 2013 at 10:58 PM, Daniel Prager < >> daniel.a.pra...@gmail.com> wrote: >> > Currently above from 2htdp/image requires at least two arguments. I.e. >> > >> > procedure >> > (above i1 i2 is ...) → image? >> > >> > Recently I have been using an idiom where I stack a list of one or more >> images. >> > I.e. >> > >> > (apply above list-of-images) >> > >> > I have a workaround, but it seems to me that a more tolerant "above" -- >> which acts as an identity when passed a single image -- would be an >> improvement to the >> > library. >> > >> > Similarly for beside, etc. >> > >> > >> > Dan >> > >> > ____________________ >> > Racket Users list: >> > http://lists.racket-lang.org/users >> > >> > >> > ____________________ >> > Racket Users list: >> > http://lists.racket-lang.org/users >> >> > > > -- > *Daniel Prager* > Agile/Lean Coaching, Software Development and Leadership > Twitter: @agilejitsu <https://twitter.com/agilejitsu> > Blog: agile-jitsu.blogspot.com >
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