Aha, great! Thanks guys! Andrew
On Sat, Oct 4, 2014 at 8:54 AM, Jens Axel Søgaard <jensa...@soegaard.net> wrote: > Hi Andrew, > > To add what Matthias say, if you need a "function version" of bitmap, > you can use bitmap/file instead. > > (require 2htdp/image) > (define path-stringy "images/some.png") > (bitmap/file path-stringy) > > Note that I changed (path-stringy) to path-stringy. > > /Jens Axel > > > > > 2014-10-04 15:48 GMT+02:00 Matthias Felleisen <matth...@ccs.neu.edu>: > > > > What you used is called a "computed string" that is, you expect bitmap > to evaluate the argument path-stringy to a string. > > > > But, in BSL, bitmap expects to be handed a literal string constant (or a > module path): > > > > --------------------------------------------------------------------- > > (require 2htdp/image) > > > > ;; with a module path > > (bitmap 2htdp/planetcute/character-cat-girl.png) > > > > ;; with a fixed string > > (bitmap > "plt/pkgs/htdp-pkgs/htdp-lib/2htdp/planetcute/character-cat-girl.png") > > --------------------------------------------------------------------- > > > > Both of these will succeed and retrieve the cat girl from the Planet > Cute collection that comes with Racket -- Matthias > > > > > > > > > > On Oct 4, 2014, at 9:36 AM, Andrew Ulrich wrote: > > > >> Hi, I've got a really simple problem, I think. Why is it that when I > try to do the following: > >> > >> (require 2htdp/image) > >> (define path-stringy "images/some.png") > >> (bitmap (path-stringy)) > >> > >> I get the following error: > >> bitmap: expected the argument to specify a local path (via a string) > or a module path (e.g. `icons/b-run.png') in: (bitmap (path-stringy)) > >> > >> I mean, shouldn't path-stringy evaluate to a string before it's passed > into bitmap? If not, then how do I use bitmap for anything dynamic? > >> > >> Thanks, > >> Andrew > >> ____________________ > >> Racket Users list: > >> http://lists.racket-lang.org/users > > > > > > ____________________ > > Racket Users list: > > http://lists.racket-lang.org/users > > > > -- > -- > Jens Axel Søgaard >
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