Ok, I'm stuck again: I'm trying to use place-image, but it keeps saying place-images: unbound identifier in module in: place-images
It doesn't even seem to work with the example code in the docs found at: http://docs.racket-lang.org/teachpack/2htdpimage.html?q=overlay#%28def._%28%28lib._2htdp%2Fimage..rkt%29._place-images%29%29 Here's what I think the docs say the code is: #lang racket (require 2htdp/universe) (require 2htdp/image) (require lang/posn) (place-images (list (circle 4 "solid" "blue") (circle 4 "solid" "white") (circle 4 "solid" "white") (circle 4 "solid" "white")) (list (make-posn 18 20) (make-posn 0 6) (make-posn 14 2) (make-posn 8 14)) (rectangle 24 24 "solid" "goldenrod")) But like I said, I get the error. I'm trying to use place-images to place a bunch of sprite images on a scene for a simple video game. I'm assuming place-images the best way to do that. Thanks in advance for helping me out. I know it's basic stuff. On Sat, Oct 4, 2014 at 9:04 AM, Andrew Ulrich <andrewsotheracco...@gmail.com > wrote: > 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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